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Code Issues 7 Pull Requests Projects Releases 14 Wiki Activity

Removed font renderer.

This commit is contained in:
Adam Harrison 2021-09-10 22:22:30 -04:00
parent 8c32950f4b
commit e25f2e9c5c
24 changed files with 420 additions and 3127 deletions
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23
data/core/docview.lua
View File

@ -150,14 +150,14 @@ function DocView:get_col_x_offset(line, col)
local font = style.syntax_fonts[type] or default_font
for char in common.utf8_chars(text) do
if column == col then
return xoffset / font:subpixel_scale()
return xoffset
end
xoffset = xoffset + font:get_width_subpixel(char)
xoffset = xoffset + font:get_width(char)
column = column + #char
end
end
return xoffset / default_font:subpixel_scale()
return xoffset
end
@ -166,14 +166,12 @@ function DocView:get_x_offset_col(line, x)
local xoffset, last_i, i = 0, 1, 1
local default_font = self:get_font()
local subpixel_scale = default_font:subpixel_scale()
local x_subpixel = subpixel_scale * x + subpixel_scale / 2
for _, type, text in self.doc.highlighter:each_token(line) do
local font = style.syntax_fonts[type] or default_font
for char in common.utf8_chars(text) do
local w = font:get_width_subpixel(char)
if xoffset >= subpixel_scale * x then
return (xoffset - x_subpixel > w / 2) and last_i or i
local w = font:get_width(char)
if xoffset >= x then
return (xoffset - x > w / 2) and last_i or i
end
xoffset = xoffset + w
last_i = i
@ -339,16 +337,11 @@ end
function DocView:draw_line_text(idx, x, y)
local default_font = self:get_font()
local subpixel_scale = default_font:subpixel_scale()
local tx, ty = subpixel_scale * x, y + self:get_line_text_y_offset()
local tx, ty = x, y + self:get_line_text_y_offset()
for _, type, text in self.doc.highlighter:each_token(idx) do
local color = style.syntax[type]
local font = style.syntax_fonts[type] or default_font
if config.draw_whitespace then
tx = renderer.draw_text_subpixel(font, text, tx, ty, color, core.replacements, style.syntax.comment)
else
tx = renderer.draw_text_subpixel(font, text, tx, ty, color)
end
tx = renderer.draw_text(font, text, tx, ty, color)
end
end

10
data/core/init.lua
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@ -393,15 +393,6 @@ function core.remove_project_directory(path)
return false
end
local function whitespace_replacements()
local r = renderer.replacements.new()
r:add(" ", "·")
r:add("\t", "»")
return r
end
local function reload_on_user_module_save()
-- auto-realod style when user's module is saved by overriding Doc:Save()
local doc_save = Doc.save
@ -499,7 +490,6 @@ function core.init()
core.visited_files = {}
core.restart_request = false
core.quit_request = false
core.replacements = whitespace_replacements()
core.root_view = RootView()
core.command_view = CommandView()

31
data/plugins/drawwhitespace.lua Normal file
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@ -0,0 +1,31 @@
-- mod-version:2 -- lite-xl 2.0
local style = require "core.style"
local DocView = require "core.docview"
local common = require "core.common"
local draw_line_text = DocView.draw_line_text
function DocView:draw_line_text(idx, x, y)
local font = (self:get_font() or style.syntax_fonts["comment"])
local color = style.syntax.comment
local ty, tx = y + self:get_line_text_y_offset()
local text, offset, s, e = self.doc.lines[idx], 1
while true do
s, e = text:find(" +", offset)
if not s then break end
tx = self:get_col_x_offset(idx, s) + x
renderer.draw_text(font, string.rep("·", e - s + 1), tx, ty, color)
offset = e + 1
end
while true do
s, e = text:find("\t", offset)
if not s then break end
tx = self:get_col_x_offset(idx, s) + x
renderer.draw_text(font, "»", tx, ty, color)
offset = e + 1
end
draw_line_text(self, idx, x, y)
end

1161
lib/font_renderer/agg_font_freetype.cpp
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File diff suppressed because it is too large Load Diff

198
lib/font_renderer/agg_font_freetype.h
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@ -1,198 +0,0 @@
//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
//
// See implementation agg_font_freetype.cpp
//
//----------------------------------------------------------------------------
#ifndef AGG_FONT_FREETYPE_INCLUDED
#define AGG_FONT_FREETYPE_INCLUDED
#include <ft2build.h>
#include FT_FREETYPE_H
#include "agg_scanline_storage_aa.h"
#include "agg_scanline_storage_bin.h"
#include "agg_scanline_u.h"
#include "agg_scanline_bin.h"
#include "agg_path_storage_integer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_conv_curve.h"
#include "agg_font_cache_manager.h"
#include "agg_trans_affine.h"
namespace agg
{
//-----------------------------------------------font_engine_freetype_base
class font_engine_freetype_base
{
public:
//--------------------------------------------------------------------
typedef serialized_scanlines_adaptor_aa<int8u> gray8_adaptor_type;
typedef serialized_scanlines_adaptor_bin mono_adaptor_type;
typedef scanline_storage_aa8 scanlines_aa_type;
typedef scanline_storage_bin scanlines_bin_type;
//--------------------------------------------------------------------
~font_engine_freetype_base();
font_engine_freetype_base(bool flag32, unsigned max_faces = 32);
// Set font parameters
//--------------------------------------------------------------------
void resolution(unsigned dpi);
bool load_font(const char* font_name, unsigned face_index, glyph_rendering ren_type,
const char* font_mem = 0, const long font_mem_size = 0);
bool attach(const char* file_name);
bool char_map(FT_Encoding map);
bool height(double h);
bool width(double w);
void hinting(bool h);
void flip_y(bool f);
void transform(const trans_affine& affine);
// Set Gamma
//--------------------------------------------------------------------
template<class GammaF> void gamma(const GammaF& f)
{
m_rasterizer.gamma(f);
}
// Accessors
//--------------------------------------------------------------------
int last_error() const { return m_last_error; }
unsigned resolution() const { return m_resolution; }
const char* name() const { return m_name; }
unsigned num_faces() const;
FT_Encoding char_map() const { return m_char_map; }
double height() const { return double(m_height) / 64.0; }
double width() const { return double(m_width) / 64.0; }
double ascender() const;
double descender() const;
int face_height() const;
int face_units_em()const;
bool hinting() const { return m_hinting; }
bool flip_y() const { return m_flip_y; }
// Interface mandatory to implement for font_cache_manager
//--------------------------------------------------------------------
const char* font_signature() const { return m_signature; }
int change_stamp() const { return m_change_stamp; }
bool prepare_glyph(unsigned glyph_code);
unsigned glyph_index() const { return m_glyph_index; }
unsigned data_size() const { return m_data_size; }
glyph_data_type data_type() const { return m_data_type; }
const rect_i& bounds() const { return m_bounds; }
double advance_x() const { return m_advance_x; }
double advance_y() const { return m_advance_y; }
void write_glyph_to(int8u* data) const;
bool add_kerning(unsigned first, unsigned second,
double* x, double* y);
private:
font_engine_freetype_base(const font_engine_freetype_base&);
const font_engine_freetype_base& operator = (const font_engine_freetype_base&);
void update_char_size();
void update_signature();
int find_face(const char* face_name) const;
bool m_flag32;
int m_change_stamp;
int m_last_error;
char* m_name;
unsigned m_name_len;
unsigned m_face_index;
FT_Encoding m_char_map;
char* m_signature;
unsigned m_height;
unsigned m_width;
bool m_hinting;
bool m_flip_y;
bool m_library_initialized;
FT_Library m_library; // handle to library
FT_Face* m_faces; // A pool of font faces
char** m_face_names;
unsigned m_num_faces;
unsigned m_max_faces;
FT_Face m_cur_face; // handle to the current face object
int m_resolution;
glyph_rendering m_glyph_rendering;
unsigned m_glyph_index;
unsigned m_data_size;
glyph_data_type m_data_type;
rect_i m_bounds;
double m_advance_x;
double m_advance_y;
trans_affine m_affine;
path_storage_integer<int16, 6> m_path16;
path_storage_integer<int32, 6> m_path32;
conv_curve<path_storage_integer<int16, 6> > m_curves16;
conv_curve<path_storage_integer<int32, 6> > m_curves32;
scanline_u8 m_scanline_aa;
scanline_bin m_scanline_bin;
scanlines_aa_type m_scanlines_aa;
scanlines_bin_type m_scanlines_bin;
rasterizer_scanline_aa<> m_rasterizer;
};
//------------------------------------------------font_engine_freetype_int16
// This class uses values of type int16 (10.6 format) for the vector cache.
// The vector cache is compact, but when rendering glyphs of height
// more that 200 there integer overflow can occur.
//
class font_engine_freetype_int16 : public font_engine_freetype_base
{
public:
typedef serialized_integer_path_adaptor<int16, 6> path_adaptor_type;
typedef font_engine_freetype_base::gray8_adaptor_type gray8_adaptor_type;
typedef font_engine_freetype_base::mono_adaptor_type mono_adaptor_type;
typedef font_engine_freetype_base::scanlines_aa_type scanlines_aa_type;
typedef font_engine_freetype_base::scanlines_bin_type scanlines_bin_type;
font_engine_freetype_int16(unsigned max_faces = 32) :
font_engine_freetype_base(false, max_faces) {}
};
//------------------------------------------------font_engine_freetype_int32
// This class uses values of type int32 (26.6 format) for the vector cache.
// The vector cache is twice larger than in font_engine_freetype_int16,
// but it allows you to render glyphs of very large sizes.
//
class font_engine_freetype_int32 : public font_engine_freetype_base
{
public:
typedef serialized_integer_path_adaptor<int32, 6> path_adaptor_type;
typedef font_engine_freetype_base::gray8_adaptor_type gray8_adaptor_type;
typedef font_engine_freetype_base::mono_adaptor_type mono_adaptor_type;
typedef font_engine_freetype_base::scanlines_aa_type scanlines_aa_type;
typedef font_engine_freetype_base::scanlines_bin_type scanlines_bin_type;
font_engine_freetype_int32(unsigned max_faces = 32) :
font_engine_freetype_base(true, max_faces) {}
};
}
#endif

73
lib/font_renderer/agg_lcd_distribution_lut.h
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@ -1,73 +0,0 @@
// Adapted by Francesco Abbate for GSL Shell
// Original code's copyright below.
//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
#ifndef AGG_LCD_DISTRIBUTION_LUT_INCLUDED
#define AGG_LCD_DISTRIBUTION_LUT_INCLUDED
#include <cstdlib>
#include "agg_basics.h"
namespace agg
{
//=====================================================lcd_distribution_lut
class lcd_distribution_lut
{
public:
lcd_distribution_lut(double prim, double second, double tert)
{
double norm = 1.0 / (prim + second*2 + tert*2);
prim *= norm;
second *= norm;
tert *= norm;
for(unsigned i = 0; i < 256; i++)
{
unsigned b = (i << 8);
unsigned s = round(second * b);
unsigned t = round(tert * b);
unsigned p = b - (2*s + 2*t);
m_data[3*i + 1] = s; /* secondary */
m_data[3*i + 2] = t; /* tertiary */
m_data[3*i ] = p; /* primary */
}
}
unsigned convolution(const int8u* covers, int i0, int i_min, int i_max) const
{
unsigned sum = 0;
int k_min = (i0 >= i_min + 2 ? -2 : i_min - i0);
int k_max = (i0 <= i_max - 2 ? 2 : i_max - i0);
for (int k = k_min; k <= k_max; k++)
{
/* select the primary, secondary or tertiary channel */
int channel = std::abs(k) % 3;
int8u c = covers[i0 + k];
sum += m_data[3*c + channel];
}
return (sum + 128) >> 8;
}
private:
unsigned short m_data[256*3];
};
}
#endif

93
lib/font_renderer/agg_pixfmt_alpha8.h
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@ -1,93 +0,0 @@
#pragma once
#include <string.h>
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
namespace agg
{
// This is a special purpose color type that only has the alpha channel.
// It can be thought as a gray color but with the intensity always on.
// It is actually used to store coverage information.
struct alpha8
{
typedef int8u value_type;
typedef int32u calc_type;
typedef int32 long_type;
enum base_scale_e
{
base_shift = 8,
base_scale = 1 << base_shift,
base_mask = base_scale - 1
};
value_type a;
//--------------------------------------------------------------------
alpha8(unsigned a_=base_mask) :
a(int8u(a_)) {}
};
// Pixer format to store coverage information.
class pixfmt_alpha8
{
public:
typedef alpha8 color_type;
typedef int8u value_type;
typedef int32u calc_type;
typedef agg::rendering_buffer::row_data row_data;
//--------------------------------------------------------------------
pixfmt_alpha8(rendering_buffer& rb): m_rbuf(&rb)
{
}
//--------------------------------------------------------------------
unsigned width() const {
return m_rbuf->width();
}
unsigned height() const {
return m_rbuf->height();
}
// This method should never be called when using the scanline_u8.
// The use of scanline_p8 should be avoided because if does not works
// properly for rendering fonts because single hspan are split in many
// hline/hspan elements and pixel whitening happens.
void blend_hline(int x, int y, unsigned len,
const color_type& c, int8u cover)
{ }
void copy_hline(int x, int y, unsigned len, const color_type& c)
{
value_type* p = (value_type*) m_rbuf->row_ptr(y) + x;
do
{
*p = c.a;
p++;
}
while(--len);
}
//--------------------------------------------------------------------
void blend_solid_hspan(int x, int y,
unsigned len,
const color_type& c,
const int8u* covers)
{
value_type* p = (value_type*) m_rbuf->row_ptr(y) + x;
do
{
calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
*p = alpha;
p++;
++covers;
}
while(--len);
}
private:
rendering_buffer* m_rbuf;
};
}

445
lib/font_renderer/font_renderer.cpp
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@ -1,445 +0,0 @@
#include "font_renderer.h"
#include "agg_lcd_distribution_lut.h"
#include "agg_pixfmt_rgb.h"
#include "agg_pixfmt_rgba.h"
#include "font_renderer_alpha.h"
// Important: when a subpixel scale is used the width below will be the width in logical pixel.
// As each logical pixel contains 3 subpixels it means that the 'pixels' pointer
// will hold enough space for '3 * width' uint8_t values.
struct FR_Bitmap {
agg::int8u *pixels;
int width, height;
};
class FR_Renderer {
public:
// Conventional LUT values: (1./3., 2./9., 1./9.)
// The values below are fine tuned as in the Elementary Plot library.
FR_Renderer(bool hinting, bool kerning, bool subpixel, bool prescale_x) :
m_renderer(hinting, kerning, subpixel, prescale_x),
m_lcd_lut(0.448, 0.184, 0.092),
m_subpixel(subpixel)
{ }
font_renderer_alpha& renderer_alpha() { return m_renderer; }
agg::lcd_distribution_lut& lcd_distribution_lut() { return m_lcd_lut; }
int subpixel_scale() const { return (m_subpixel ? 3 : 1); }
private:
font_renderer_alpha m_renderer;
agg::lcd_distribution_lut m_lcd_lut;
int m_subpixel;
};
FR_Renderer *FR_Renderer_New(unsigned int flags) {
bool hinting = ((flags & FR_HINTING) != 0);
bool kerning = ((flags & FR_KERNING) != 0);
bool subpixel = ((flags & FR_SUBPIXEL) != 0);
bool prescale_x = ((flags & FR_PRESCALE_X) != 0);
return new FR_Renderer(hinting, kerning, subpixel, prescale_x);
}
FR_Bitmap* FR_Bitmap_New(FR_Renderer *font_renderer, int width, int height) {
const int subpixel_scale = font_renderer->subpixel_scale();
FR_Bitmap *image = (FR_Bitmap *) malloc(sizeof(FR_Bitmap) + width * height * subpixel_scale);
if (!image) { return NULL; }
image->pixels = (agg::int8u *) (image + 1);
image->width = width;
image->height = height;
return image;
}
void FR_Bitmap_Free(FR_Bitmap *image) {
free(image);
}
void FR_Renderer_Free(FR_Renderer *font_renderer) {
delete font_renderer;
}
int FR_Subpixel_Scale(FR_Renderer *font_renderer) {
return font_renderer->subpixel_scale();
}
int FR_Load_Font(FR_Renderer *font_renderer, const char *filename) {
bool success = font_renderer->renderer_alpha().load_font(filename);
return (success ? 0 : 1);
}
int FR_Get_Font_Height(FR_Renderer *font_renderer, float size) {
font_renderer_alpha& renderer_alpha = font_renderer->renderer_alpha();
double ascender, descender;
renderer_alpha.get_font_vmetrics(ascender, descender);
int face_height = renderer_alpha.get_face_height();
float scale = renderer_alpha.scale_for_em_to_pixels(size);
return int((ascender - descender) * face_height * scale + 0.5);
}
static void glyph_trim_rect(agg::rendering_buffer& ren_buf, FR_Bitmap_Glyph_Metrics& gli, int subpixel_scale) {
const int height = ren_buf.height();
int x0 = gli.x0 * subpixel_scale, x1 = gli.x1 * subpixel_scale;
int y0 = gli.y0, y1 = gli.y1;
for (int y = gli.y0; y < gli.y1; y++) {
const uint8_t *row = ren_buf.row_ptr(height - 1 - y);
unsigned int row_bitsum = 0;
for (int x = x0; x < x1; x++) {
row_bitsum |= row[x];
}
if (row_bitsum == 0) {
y0++;
} else {
break;
}
}
for (int y = gli.y1 - 1; y >= y0; y--) {
const uint8_t *row = ren_buf.row_ptr(height - 1 - y);
unsigned int row_bitsum = 0;
for (int x = x0; x < x1; x++) {
row_bitsum |= row[x];
}
if (row_bitsum == 0) {
y1--;
} else {
break;
}
}
for (int x = gli.x0 * subpixel_scale; x < gli.x1 * subpixel_scale; x += subpixel_scale) {
unsigned int xaccu = 0;
for (int y = y0; y < y1; y++) {
const uint8_t *row = ren_buf.row_ptr(height - 1 - y);
for (int i = 0; i < subpixel_scale; i++) {
xaccu |= row[x + i];
}
}
if (xaccu == 0) {
x0 += subpixel_scale;
} else {
break;
}
}
for (int x = (gli.x1 - 1) * subpixel_scale; x >= x0; x -= subpixel_scale) {
unsigned int xaccu = 0;
for (int y = y0; y < y1; y++) {
const uint8_t *row = ren_buf.row_ptr(height - 1 - y);
for (int i = 0; i < subpixel_scale; i++) {
xaccu |= row[x + i];
}
}
if (xaccu == 0) {
x1 -= subpixel_scale;
} else {
break;
}
}
gli.xoff += (x0 / subpixel_scale) - gli.x0;
gli.yoff += (y0 - gli.y0);
gli.x0 = x0 / subpixel_scale;
gli.y0 = y0;
gli.x1 = x1 / subpixel_scale;
gli.y1 = y1;
}
static void glyph_lut_convolution(agg::rendering_buffer ren_buf, agg::lcd_distribution_lut& lcd_lut, agg::int8u *covers_buf, FR_Bitmap_Glyph_Metrics& gli) {
const int subpixel = 3;
const int x0 = gli.x0, y0 = gli.y0, x1 = gli.x1, y1 = gli.y1;
const int len = (x1 - x0) * subpixel;
const int height = ren_buf.height();
for (int y = y0; y < y1; y++) {
agg::int8u *covers = ren_buf.row_ptr(height - 1 - y) + x0 * subpixel;
memcpy(covers_buf, covers, len);
for (int x = x0 - 1; x < x1 + 1; x++) {
for (int i = 0; i < subpixel; i++) {
const int cx = (x - x0) * subpixel + i;
covers[cx] = lcd_lut.convolution(covers_buf, cx, 0, len - 1);
}
}
}
gli.x0 -= 1;
gli.x1 += 1;
gli.xoff -= 1;
}
// The two functions below are needed because in C and C++ integer division
// is rounded toward zero.
// euclidean division rounded toward positive infinite
static int div_pos(int n, int p) {
return n >= 0 ? (n + p - 1) / p : (n / p);
}
// euclidean division rounded toward negative infinite
static int div_neg(int n, int p) {
return n >= 0 ? (n / p) : ((n - p + 1) / p);
}
FR_Bitmap *FR_Bake_Font_Bitmap(FR_Renderer *font_renderer, int font_height,
int first_char, int num_chars, FR_Bitmap_Glyph_Metrics *glyphs)
{
font_renderer_alpha& renderer_alpha = font_renderer->renderer_alpha();
agg::lcd_distribution_lut& lcd_lut = font_renderer->lcd_distribution_lut();
const int subpixel_scale = font_renderer->subpixel_scale();
double ascender, descender;
renderer_alpha.get_font_vmetrics(ascender, descender);
const int ascender_px = int(ascender * font_height);
const int pad_y = 1;
// When using subpixel font rendering it is needed to leave a padding pixel on the left and on the right.
// Since each pixel is composed by n subpixel we set below x_start to subpixel_scale instead than zero.
// In addition we need one more pixel on the left because of subpixel positioning so
// it adds up to 2 * subpixel_scale.
// Note about the coordinates: they are AGG-like so x is positive toward the right and
// y is positive in the upper direction.
const int x_start = 2 * subpixel_scale;
const agg::alpha8 text_color(0xff);
#ifdef FONT_RENDERER_HEIGHT_HACK
const int font_height_reduced = (font_height * 86) / 100;
#else
const int font_height_reduced = font_height;
#endif
renderer_alpha.set_font_height(font_height_reduced);
int *index = (int *) malloc(num_chars * sizeof(int));
agg::rect_i *bounds = (agg::rect_i *) malloc(num_chars * sizeof(agg::rect_i));
if (!index || !bounds) {
free(index);
free(bounds);
return NULL;
}
int x_size_sum = 0, glyph_count = 0;
for (int i = 0; i < num_chars; i++) {
int codepoint = first_char + i;
index[i] = i;
if (renderer_alpha.codepoint_bounds(codepoint, subpixel_scale, bounds[i])) {
// Invalid glyph
bounds[i].x1 = 0;
bounds[i].y1 = 0;
bounds[i].x2 = -1;
bounds[i].y2 = -1;
} else {
if (bounds[i].x2 > bounds[i].x1) {
x_size_sum += bounds[i].x2 - bounds[i].x1;
glyph_count++;
}
bounds[i].x1 = subpixel_scale * div_neg(bounds[i].x1, subpixel_scale);
bounds[i].x2 = subpixel_scale * div_pos(bounds[i].x2, subpixel_scale);
}
}
// Simple insertion sort algorithm: https://en.wikipedia.org/wiki/Insertion_sort
int i = 1;
while (i < num_chars) {
int j = i;
while (j > 0 && bounds[index[j-1]].y2 - bounds[index[j-1]].y1 > bounds[index[j]].y2 - bounds[index[j]].y1) {
int tmp = index[j];
index[j] = index[j-1];
index[j-1] = tmp;
j = j - 1;
}
i = i + 1;
}
const int glyph_avg_width = glyph_count > 0 ? x_size_sum / (glyph_count * subpixel_scale) : font_height;
const int pixels_width = glyph_avg_width > 0 ? glyph_avg_width * 28 : 28;
// dry run simulating pixel position to estimate required image's height
int x = x_start, y = 0, y_bottom = y;
for (int i = 0; i < num_chars; i++) {
const agg::rect_i& gbounds = bounds[index[i]];
if (gbounds.x2 < gbounds.x1) continue;
// 1. It is very important to ensure that the x's increment below (1) and in
// (2), (3) and (4) are perfectly the same.
// Note that x_step below is always an integer multiple of subpixel_scale.
const int x_step = gbounds.x2 + 3 * subpixel_scale;
if (x + x_step >= pixels_width * subpixel_scale) {
x = x_start;
y = y_bottom;
}
// 5. Ensure that y's increment below is exactly the same to the one used in (6)
const int glyph_y_bottom = y - 2 * pad_y - (gbounds.y2 - gbounds.y1);
y_bottom = (y_bottom > glyph_y_bottom ? glyph_y_bottom : y_bottom);
// 2. Ensure x's increment is aligned with (1)
x = x + x_step;
}
agg::int8u *cover_swap_buffer = (agg::int8u *) malloc(sizeof(agg::int8u) * (pixels_width * subpixel_scale));
if (!cover_swap_buffer) {
free(index);
free(bounds);
return NULL;
}
const int pixels_height = -y_bottom + 1;
const int pixel_size = 1;
FR_Bitmap *image = FR_Bitmap_New(font_renderer, pixels_width, pixels_height);
if (!image) {
free(index);
free(bounds);
free(cover_swap_buffer);
return NULL;
}
agg::int8u *pixels = image->pixels;
memset(pixels, 0x00, pixels_width * pixels_height * subpixel_scale * pixel_size);
agg::rendering_buffer ren_buf(pixels, pixels_width * subpixel_scale, pixels_height, -pixels_width * subpixel_scale * pixel_size);
// The variable y_bottom will be used to go down to the next row by taking into
// account the space occupied by each glyph of the current row along the y direction.
x = x_start;
// Set y to the image's height minus one to begin writing glyphs in the upper part of the image.
y = pixels_height - 1;
y_bottom = y;
for (int i = 0; i < num_chars; i++) {
// Important: the variable x in this loop should always be an integer multiple
// of subpixel_scale.
int codepoint = first_char + index[i];
const agg::rect_i& gbounds = bounds[index[i]];
if (gbounds.x2 < gbounds.x1) continue;
// 3. Ensure x's increment is aligned with (1)
// Note that x_step below is always an integer multiple of subpixel_scale.
// We need 3 * subpixel_scale because:
// . +1 pixel on the left, because of RGB color filter
// . +1 pixel on the right, because of RGB color filter
// . +1 pixel on the right, because of subpixel positioning
// and each pixel requires "subpixel_scale" sub-pixels.
const int x_step = gbounds.x2 + 3 * subpixel_scale;
if (x + x_step >= pixels_width * subpixel_scale) {
// No more space along x, begin writing the row below.
x = x_start;
y = y_bottom;
}
const int y_baseline = y - pad_y - gbounds.y2;
// 6. Ensure the y's increment below is aligned with the increment used in (5)
const int glyph_y_bottom = y - 2 * pad_y - (gbounds.y2 - gbounds.y1);
y_bottom = (y_bottom > glyph_y_bottom ? glyph_y_bottom : y_bottom);
double x_next = x, y_next = y_baseline;
renderer_alpha.render_codepoint(ren_buf, text_color, x_next, y_next, codepoint, subpixel_scale);
// The y coordinate for the glyph below is positive in the bottom direction,
// like is used by Lite's drawing system.
FR_Bitmap_Glyph_Metrics& glyph_info = glyphs[index[i]];
glyph_info.x0 = x / subpixel_scale;
glyph_info.y0 = pixels_height - 1 - (y_baseline + gbounds.y2 + pad_y);
glyph_info.x1 = div_pos(x_next + 0.5, subpixel_scale);
glyph_info.y1 = pixels_height - 1 - (y_baseline + gbounds.y1 - pad_y);
glyph_info.xoff = 0;
glyph_info.yoff = -pad_y - gbounds.y2 + ascender_px;
// Note that below the xadvance is in pixels times the subpixel_scale.
// This is meant for subpixel positioning.
glyph_info.xadvance = roundf(x_next - x);
if (subpixel_scale != 1 && glyph_info.x1 > glyph_info.x0) {
glyph_lut_convolution(ren_buf, lcd_lut, cover_swap_buffer, glyph_info);
}
glyph_trim_rect(ren_buf, glyph_info, subpixel_scale);
// When subpixel is activated we need one padding pixel on the left and on the right
// and one more because of subpixel positioning.
// 4. Ensure x's increment is aligned with (1)
x = x + x_step;
}
free(index);
free(bounds);
free(cover_swap_buffer);
return image;
}
template <typename Order>
void blend_solid_hspan(agg::rendering_buffer& rbuf, int x, int y, unsigned len,
const agg::rgba8& c, const agg::int8u* covers)
{
const int pixel_size = 4;
agg::int8u* p = rbuf.row_ptr(y) + x * pixel_size;
do
{
const unsigned alpha = *covers;
const unsigned r = p[Order::R], g = p[Order::G], b = p[Order::B];
p[Order::R] = (((unsigned(c.r) - r) * alpha) >> 8) + r;
p[Order::G] = (((unsigned(c.g) - g) * alpha) >> 8) + g;
p[Order::B] = (((unsigned(c.b) - b) * alpha) >> 8) + b;
// Leave p[3], the alpha channel value unmodified.
p += 4;
++covers;
}
while(--len);
}
template <typename Order>
void blend_solid_hspan_subpixel(agg::rendering_buffer& rbuf, agg::lcd_distribution_lut& lcd_lut,
const int x, const int y, unsigned len,
const agg::rgba8& c,
const agg::int8u* covers)
{
const int pixel_size = 4;
const unsigned rgb[3] = { c.r, c.g, c.b };
agg::int8u* p = rbuf.row_ptr(y) + x * pixel_size;
// Indexes to adress RGB colors in a BGRA32 format.
const int pixel_index[3] = {Order::R, Order::G, Order::B};
for (unsigned cx = 0; cx < len; cx += 3)
{
for (int i = 0; i < 3; i++) {
const unsigned cover_value = covers[cx + i];
const unsigned alpha = (cover_value + 1) * (c.a + 1);
const unsigned src_col = *(p + pixel_index[i]);
*(p + pixel_index[i]) = (((rgb[i] - src_col) * alpha) + (src_col << 16)) >> 16;
}
// Leave p[3], the alpha channel value unmodified.
p += 4;
}
}
// destination implicitly BGRA32. Source implictly single-byte renderer_alpha coverage with subpixel scale = 3.
// FIXME: consider using something like RenColor* instead of uint8_t * for dst.
void FR_Blend_Glyph(FR_Renderer *font_renderer, FR_Clip_Area *clip, int x_mult, int y, uint8_t *dst, int dst_width, const FR_Bitmap *glyphs_bitmap, const FR_Bitmap_Glyph_Metrics *glyph, FR_Color color) {
agg::lcd_distribution_lut& lcd_lut = font_renderer->lcd_distribution_lut();
const int subpixel_scale = font_renderer->subpixel_scale();
const int pixel_size = 4; // Pixel size for BGRA32 format.
int x = x_mult / subpixel_scale;
x += glyph->xoff;
y += glyph->yoff;
int glyph_x = glyph->x0, glyph_y = glyph->y0;
int glyph_x_subpixel = -(x_mult % subpixel_scale);
int glyph_width = glyph->x1 - glyph->x0;
int glyph_height = glyph->y1 - glyph->y0;
int n;
if ((n = clip->left - x) > 0) { glyph_width -= n; glyph_x += n; x += n; }
if ((n = clip->top - y) > 0) { glyph_height -= n; glyph_y += n; y += n; }
if ((n = x + glyph_width - clip->right ) > 0) { glyph_width -= n; }
if ((n = y + glyph_height - clip->bottom) > 0) { glyph_height -= n; }
if (glyph_width <= 0 || glyph_height <= 0) {
return;
}
dst += (x + y * dst_width) * pixel_size;
agg::rendering_buffer dst_ren_buf(dst, glyph_width, glyph_height, dst_width * pixel_size);
uint8_t *src = glyphs_bitmap->pixels + (glyph_x + glyph_y * glyphs_bitmap->width) * subpixel_scale + glyph_x_subpixel;
int src_stride = glyphs_bitmap->width * subpixel_scale;
const agg::rgba8 color_a(color.r, color.g, color.b);
for (int x = 0, y = 0; y < glyph_height; y++) {
agg::int8u *covers = src + y * src_stride;
if (subpixel_scale == 1) {
blend_solid_hspan<agg::order_bgra>(dst_ren_buf, x, y, glyph_width, color_a, covers);
} else {
blend_solid_hspan_subpixel<agg::order_bgra>(dst_ren_buf, lcd_lut, x, y, glyph_width * subpixel_scale, color_a, covers);
}
}
}

58
lib/font_renderer/font_renderer.h
View File

@ -1,58 +0,0 @@
#ifndef FONT_RENDERER_H
#define FONT_RENDERER_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
unsigned short x0, y0, x1, y1;
float xoff, yoff, xadvance;
} FR_Bitmap_Glyph_Metrics;
typedef struct FR_Bitmap FR_Bitmap;
#ifdef __cplusplus
class FR_Renderer;
#else
struct FR_Renderer;
typedef struct FR_Renderer FR_Renderer;
#endif
enum {
FR_HINTING = 1 << 0,
FR_KERNING = 1 << 1,
FR_SUBPIXEL = 1 << 2,
FR_PRESCALE_X = 1 << 3,
};
typedef struct {
uint8_t r, g, b;
} FR_Color;
typedef struct {
int left, top, right, bottom;
} FR_Clip_Area;
FR_Renderer * FR_Renderer_New(unsigned int flags);
void FR_Renderer_Free(FR_Renderer *);
int FR_Load_Font(FR_Renderer *, const char *filename);
FR_Bitmap* FR_Bitmap_New(FR_Renderer *, int width, int height);
void FR_Bitmap_Free(FR_Bitmap *image);
int FR_Get_Font_Height(FR_Renderer *, float size);
FR_Bitmap * FR_Bake_Font_Bitmap(FR_Renderer *, int font_height,
int first_char, int num_chars, FR_Bitmap_Glyph_Metrics *glyph_info);
void FR_Blend_Glyph(FR_Renderer *font_renderer,
FR_Clip_Area *clip, int x, int y,
uint8_t *dst, int dst_width,
const FR_Bitmap *glyphs_bitmap,
const FR_Bitmap_Glyph_Metrics *glyph, FR_Color color);
int FR_Subpixel_Scale(FR_Renderer *);
#ifdef __cplusplus
}
#endif
#endif

164
lib/font_renderer/font_renderer_alpha.h
View File

@ -1,164 +0,0 @@
#pragma once
#include "agg_basics.h"
#include "agg_conv_curve.h"
#include "agg_conv_transform.h"
#include "agg_gamma_lut.h"
#include "agg_font_freetype.h"
#include "agg_pixfmt_alpha8.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_renderer_primitives.h"
#include "agg_renderer_scanline.h"
#include "agg_rendering_buffer.h"
#include "agg_scanline_u.h"
class font_renderer_alpha
{
typedef agg::pixfmt_alpha8 pixfmt_type;
typedef agg::renderer_base<pixfmt_type> base_ren_type;
typedef agg::renderer_scanline_aa_solid<base_ren_type> renderer_solid;
typedef agg::font_engine_freetype_int32 font_engine_type;
typedef agg::font_cache_manager<font_engine_type> font_manager_type;
font_engine_type m_feng;
font_manager_type m_fman;
// Font rendering options.
bool m_hinting;
bool m_kerning;
bool m_subpixel;
bool m_prescale_x;
bool m_font_loaded;
// Pipeline to process the vectors glyph paths (curves + contour)
agg::trans_affine m_mtx;
agg::conv_curve<font_manager_type::path_adaptor_type> m_curves;
agg::conv_transform<agg::conv_curve<font_manager_type::path_adaptor_type> > m_trans;
public:
typedef agg::pixfmt_alpha8::color_type color_type;
font_renderer_alpha(bool hinting, bool kerning, bool subpixel, bool prescale_x):
m_feng(),
m_fman(m_feng),
m_hinting(hinting),
m_kerning(kerning),
m_subpixel(subpixel),
m_prescale_x(prescale_x),
m_font_loaded(false),
m_curves(m_fman.path_adaptor()),
m_trans(m_curves, m_mtx)
{ }
int get_face_height() const {
return m_feng.face_height();
}
void get_font_vmetrics(double& ascender, double& descender) {
double current_height = m_feng.height();
m_feng.height(1.0);
ascender = m_feng.ascender();
descender = m_feng.descender();
m_feng.height(current_height);
}
float scale_for_em_to_pixels(float size) {
int units_per_em = m_feng.face_units_em();
if (units_per_em > 0) {
return size / units_per_em;
}
return 0.0;
}
bool load_font(const char *font_filename) {
if(m_feng.load_font(font_filename, 0, agg::glyph_ren_outline)) {
m_font_loaded = true;
m_feng.hinting(m_hinting);
}
return m_font_loaded;
}
void set_font_height(double height) {
const double scale_x = (m_prescale_x ? 100.0 : 1.0);
m_feng.height(height);
m_feng.width(height * scale_x);
}
template<class Rasterizer, class Scanline, class RenSolid>
void draw_codepoint(Rasterizer& ras, Scanline& sl,
RenSolid& ren_solid, const color_type color,
int codepoint, double& x, double& y, const int subpixel_scale)
{
const double scale_x = (m_prescale_x ? 100.0 : 1.0);
// Coefficient to scale back the glyph to the final scale.
const double cx_inv_scale = subpixel_scale / scale_x;
// Represent the delta in x scaled by scale_x.
double x_delta = 0;
double start_x = x;
const agg::glyph_cache* glyph = m_fman.glyph(codepoint);
if(glyph)
{
if(m_kerning)
{
m_fman.add_kerning(&x_delta, &y);
}
m_fman.init_embedded_adaptors(glyph, 0, 0);
if(glyph->data_type == agg::glyph_data_outline)
{
double ty = m_hinting ? floor(y + 0.5) : y;
ras.reset();
m_mtx.reset();
m_mtx *= agg::trans_affine_scaling(cx_inv_scale, 1);
m_mtx *= agg::trans_affine_translation(start_x + cx_inv_scale * x_delta, ty);
ras.add_path(m_trans);
ren_solid.color(color);
agg::render_scanlines(ras, sl, ren_solid);
}
y += glyph->advance_y;
x += cx_inv_scale * (x_delta + glyph->advance_x);
}
}
void clear(agg::rendering_buffer& ren_buf, const color_type color) {
pixfmt_type pf(ren_buf);
base_ren_type ren_base(pf);
ren_base.clear(color);
}
void render_codepoint(agg::rendering_buffer& ren_buf,
const color_type text_color,
double& x, double& y,
int codepoint, const int subpixel_scale)
{
if (!m_font_loaded) {
return;
}
agg::scanline_u8 sl;
agg::rasterizer_scanline_aa<> ras;
ras.clip_box(0, 0, ren_buf.width(), ren_buf.height());
agg::pixfmt_alpha8 pf(ren_buf);
base_ren_type ren_base(pf);
renderer_solid ren_solid(ren_base);
draw_codepoint(ras, sl, ren_solid, text_color, codepoint, x, y, subpixel_scale);
}
int codepoint_bounds(int codepoint, const int subpixel_scale, agg::rect_i& bounds)
{
if (!m_font_loaded) return 1;
const double scale_x = (m_prescale_x ? 100.0 : 1.0);
const double cx_inv_scale = subpixel_scale / scale_x;
const agg::glyph_cache* glyph = m_fman.glyph(codepoint);
if (glyph) {
bounds = glyph->bounds;
bounds.x1 *= cx_inv_scale;
bounds.x2 *= cx_inv_scale;
return 0;
}
return 1;
}
};

19
lib/font_renderer/meson.build
View File

@ -1,19 +0,0 @@
freetype_dep = dependency('freetype2')
libagg_dep = dependency('libagg', fallback: ['libagg', 'libagg_dep'])
font_renderer_sources = [
'agg_font_freetype.cpp',
'font_renderer.cpp',
]
font_renderer_cdefs = ['-DFONT_RENDERER_HEIGHT_HACK']
font_renderer_include = include_directories('.')
libfontrenderer = static_library('fontrenderer',
font_renderer_sources,
dependencies: [libagg_dep, freetype_dep],
cpp_args: font_renderer_cdefs,
)

125
lib/font_renderer/notes-lite-font-rendering.md
View File

@ -1,125 +0,0 @@
```c
stbtt_InitFont
stbtt_ScaleForMappingEmToPixels x 3
stbtt_ScaleForPixelHeight
stbtt_BakeFontBitmap
stbtt_GetFontVMetrics x 2
typedef struct {
unsigned short x0, y0, x1, y1; // coordinates of bbox in bitmap
float xoff, yoff, xadvance;
} stbtt_bakedchar;
struct RenImage {
RenColor *pixels;
int width, height;
};
typedef struct {
RenImage *image;
stbtt_bakedchar glyphs[256];
} GlyphSet;
struct RenFont {
void *data;
stbtt_fontinfo stbfont;
GlyphSet *sets[MAX_GLYPHSET];
float size;
int height;
};
```
The function stbtt_BakeFontBitmap is used to write bitmap data into set->image->pixels (where set is a GlyphSet).
Note that set->image->pixels need data in RGB format. After stbtt_BakeFontBitmap call the bitmap data are converted into RGB.
With a single call many glyphs corresponding to a range of codepoints, all in a
single image.
## STB truetype font metrics
stbtt_ScaleForPixelHeight takes a float 'height' and returns height / (ascent - descent).
stbtt_ScaleForMappingEmToPixels take a float 'pixels' and returns pixels / unitsPerEm.
### Computing RenFont
When loading a font, in renderer.c, the font->height is determined as:
```c
int ascent, descent, linegap;
stbtt_GetFontVMetrics(&font->stbfont, &ascent, &descent, &linegap);
float scale = stbtt_ScaleForMappingEmToPixels(&font->stbfont, font->size);
font->height = (ascent - descent + linegap) * scale + 0.5;
```
so, mathematically
```c
font->height = (ascent - descent + linegap) * font->size / unitsPerEm + 0.5;
```
**TO DO**: find out for what font->height is actually used.
### Call to BakeFontBitmap
In the same file, renderer.c, to create the glyphset image it computes:
```c
// Using stbtt functions
float s = ScaleForMappingEmToPixels(1) / ScaleForPixelHeight(1);
```
so 's' is actually equal to (ascent - descent) / unitsPerEm.
Then BakeFontBitmap is called and `font->size * s` is used for the pixel_height argument.
So BakeFontBitmap gets
```c
pixel_height = (ascent - descent) * font->size / unitsPerEm;
```
In turns BakeFontBitmap passes pixel_height to ScaleForPixelHeight() and uses the
resulting 'scale' to scale the glyphs by passing it to MakeGlyphBitmap().
This is equal almost equal to font->height except the 0.5, the missing linegap calculation
and the fact that this latter is an integer instead of a float.
## AGG Font Engine
Calls
`FT_Init_FreeType` (initialize the library)
In `load_font()` method:
`FT_New_Face` or `FT_New_Memory_Face` (use `FT_Done_Face` when done)
`FT_Attach_File`
`FT_Select_Charmap`
In `update_char_size()` method:
`FT_Set_Char_Size` or `FT_Set_Pixel_Sizes`
In `prepare_glyph()` method:
`FT_Get_Char_Index`
`FT_Load_Glyph`
`FT_Render_Glyph` (if glyph_render_native_mono or native_gray8)
in `add_kerning()` method
`FT_Get_Kerning`
`FT_Done_FreeType` (end with library)
## Freetype2's metrics related function and structs
`FT_New_Face` return a `FT_Face` (a pointer) with font face information.
## AGG font engine's font size
The variable `m_height` is the size of the font muliplied by 64.
It will be used to set font size with:
- `FT_Set_Char_Size` if m_resolution is set (> 0)
- `FT_Set_Pixel_Sizes`, divided by 64, if m_resolution is not set (= 0)
The method height() returns m_height / 64;

4
src/api/api.c
View File

@ -6,7 +6,6 @@ int luaopen_renderer(lua_State *L);
int luaopen_regex(lua_State *L);
int luaopen_process(lua_State *L);
static const luaL_Reg libs[] = {
{ "system", luaopen_system },
{ "renderer", luaopen_renderer },
@ -16,7 +15,6 @@ static const luaL_Reg libs[] = {
};
void api_load_libs(lua_State *L) {
for (int i = 0; libs[i].name; i++) {
for (int i = 0; libs[i].name; i++)
luaL_requiref(L, libs[i].name, libs[i].func, 1);
}
}

9
src/api/api.h
View File

@ -1,14 +1,15 @@
#ifndef API_H
#define API_H
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#define API_TYPE_FONT "Font"
#define API_TYPE_REPLACE "Replace"
#define API_TYPE_PROCESS "Process"
#define API_CONSTANT_DEFINE(L, idx, key, n) (lua_pushnumber(L, n), lua_setfield(L, idx - 1, key))
void api_load_libs(lua_State *L);
#endif

42
src/api/cp_replace.c
View File

@ -1,42 +0,0 @@
#include "api.h"
#include "renderer.h"
static int f_new(lua_State *L) {
CPReplaceTable *rep_table = lua_newuserdata(L, sizeof(CPReplaceTable));
luaL_setmetatable(L, API_TYPE_REPLACE);
ren_cp_replace_init(rep_table);
return 1;
}
static int f_gc(lua_State *L) {
CPReplaceTable *rep_table = luaL_checkudata(L, 1, API_TYPE_REPLACE);
ren_cp_replace_free(rep_table);
return 0;
}
static int f_add(lua_State *L) {
CPReplaceTable *rep_table = luaL_checkudata(L, 1, API_TYPE_REPLACE);
const char *src = luaL_checkstring(L, 2);
const char *dst = luaL_checkstring(L, 3);
ren_cp_replace_add(rep_table, src, dst);
return 0;
}
static const luaL_Reg lib[] = {
{ "__gc", f_gc },
{ "new", f_new },
{ "add", f_add },
{ NULL, NULL }
};
int luaopen_renderer_replacements(lua_State *L) {
luaL_newmetatable(L, API_TYPE_REPLACE);
luaL_setfuncs(L, lib, 0);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
return 1;
}

18
src/api/regex.c
View File

@ -101,17 +101,11 @@ int luaopen_regex(lua_State *L) {
lua_setfield(L, -2, "__name");
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, "regex");
lua_pushnumber(L, PCRE2_ANCHORED);
lua_setfield(L, -2, "ANCHORED");
lua_pushnumber(L, PCRE2_ANCHORED) ;
lua_setfield(L, -2, "ENDANCHORED");
lua_pushnumber(L, PCRE2_NOTBOL);
lua_setfield(L, -2, "NOTBOL");
lua_pushnumber(L, PCRE2_NOTEOL);
lua_setfield(L, -2, "NOTEOL");
lua_pushnumber(L, PCRE2_NOTEMPTY);
lua_setfield(L, -2, "NOTEMPTY");
lua_pushnumber(L, PCRE2_NOTEMPTY_ATSTART);
lua_setfield(L, -2, "NOTEMPTY_ATSTART");
API_CONSTANT_DEFINE(L, -1, "ANCHORED", PCRE2_ANCHORED);
API_CONSTANT_DEFINE(L, -1, "ENDANCHORED", PCRE2_ENDANCHORED);
API_CONSTANT_DEFINE(L, -1, "NOTBOL", PCRE2_NOTBOL);
API_CONSTANT_DEFINE(L, -1, "NOTEOL", PCRE2_NOTEOL);
API_CONSTANT_DEFINE(L, -1, "NOTEMPTY", PCRE2_NOTEMPTY);
API_CONSTANT_DEFINE(L, -1, "NOTEMPTY_ATSTART", PCRE2_NOTEMPTY_ATSTART);
return 1;
}

136
src/api/renderer.c
View File

@ -2,6 +2,92 @@
#include "renderer.h"
#include "rencache.h"
static int f_font_load(lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
float size = luaL_checknumber(L, 2);
unsigned int font_hinting = FONT_HINTING_SLIGHT;
bool subpixel = true;
if (lua_gettop(L) > 2 && lua_istable(L, 3)) {
lua_getfield(L, 3, "antialiasing");
if (lua_isstring(L, -1)) {
const char *antialiasing = lua_tostring(L, -1);
if (antialiasing) {
if (strcmp(antialiasing, "grayscale") == 0) {
subpixel = false;
} else if (strcmp(antialiasing, "subpixel") == 0) {
subpixel = true;
} else {
return luaL_error(L, "error in renderer.font.load, unknown antialiasing option: \"%s\"", antialiasing);
}
}
}
lua_pop(L, 1);
lua_getfield(L, 3, "hinting");
if (lua_isstring(L, -1)) {
const char *hinting = lua_tostring(L, -1);
if (hinting) {
if (strcmp(hinting, "slight") == 0) {
font_hinting = FONT_HINTING_SLIGHT;
} else if (strcmp(hinting, "none") == 0) {
font_hinting = FONT_HINTING_NONE;
} else if (strcmp(hinting, "full") == 0) {
font_hinting = FONT_HINTING_FULL;
} else {
return luaL_error(L, "error in renderer.font.load, unknown hinting option: \"%s\"", hinting);
}
}
}
lua_pop(L, 1);
}
RenFont** font = lua_newuserdata(L, sizeof(RenFont*));
*font = ren_font_load(filename, size, subpixel, font_hinting);
if (!*font)
return luaL_error(L, "failed to load font");
luaL_setmetatable(L, API_TYPE_FONT);
return 1;
}
static int f_font_copy(lua_State *L) {
RenFont** self = luaL_checkudata(L, 1, API_TYPE_FONT);
float size = lua_gettop(L) >= 2 ? luaL_checknumber(L, 2) : ren_font_get_height(*self);
RenFont** font = lua_newuserdata(L, sizeof(RenFont*));
*font = ren_font_copy(*self, size);
if (!*font)
return luaL_error(L, "failed to copy font");
luaL_setmetatable(L, API_TYPE_FONT);
return 1;
}
static int f_font_set_tab_size(lua_State *L) {
RenFont** self = luaL_checkudata(L, 1, API_TYPE_FONT);
int n = luaL_checknumber(L, 2);
ren_font_set_tab_size(*self, n);
return 0;
}
static int f_font_gc(lua_State *L) {
RenFont** self = luaL_checkudata(L, 1, API_TYPE_FONT);
ren_font_free(*self);
return 0;
}
static int f_font_get_width(lua_State *L) {
RenFont** self = luaL_checkudata(L, 1, API_TYPE_FONT);
lua_pushnumber(L, ren_font_get_width(*self, luaL_checkstring(L, 2)));
return 1;
}
static int f_font_get_height(lua_State *L) {
RenFont** self = luaL_checkudata(L, 1, API_TYPE_FONT);
lua_pushnumber(L, ren_font_get_height(*self));
return 1;
}
static int f_font_get_size(lua_State *L) {
RenFont** self = luaL_checkudata(L, 1, API_TYPE_FONT);
lua_pushnumber(L, ren_font_get_size(*self));
return 1;
}
static RenColor checkcolor(lua_State *L, int idx, int def) {
RenColor color;
@ -71,40 +157,17 @@ static int f_draw_rect(lua_State *L) {
return 0;
}
static int draw_text_subpixel_impl(lua_State *L, bool draw_subpixel) {
FontDesc *font_desc = luaL_checkudata(L, 1, API_TYPE_FONT);
static int f_draw_text(lua_State *L) {
RenFont** font = luaL_checkudata(L, 1, API_TYPE_FONT);
const char *text = luaL_checkstring(L, 2);
/* The coordinate below will be in subpixel iff draw_subpixel is true.
Otherwise it will be in pixels. */
int x_subpixel = luaL_checknumber(L, 3);
int y = luaL_checknumber(L, 4);
RenColor color = checkcolor(L, 5, 255);
CPReplaceTable *rep_table;
RenColor replace_color;
if (lua_gettop(L) >= 7) {
rep_table = luaL_checkudata(L, 6, API_TYPE_REPLACE);
replace_color = checkcolor(L, 7, 255);
} else {
rep_table = NULL;
replace_color = (RenColor) {0};
}
x_subpixel = rencache_draw_text(L, font_desc, 1, text, x_subpixel, y, color, draw_subpixel, rep_table, replace_color);
x_subpixel = rencache_draw_text(L, *font, text, x_subpixel, y, color);
lua_pushnumber(L, x_subpixel);
return 1;
}
static int f_draw_text(lua_State *L) {
return draw_text_subpixel_impl(L, false);
}
static int f_draw_text_subpixel(lua_State *L) {
return draw_text_subpixel_impl(L, true);
}
static const luaL_Reg lib[] = {
{ "show_debug", f_show_debug },
{ "get_size", f_get_size },
@ -113,19 +176,26 @@ static const luaL_Reg lib[] = {
{ "set_clip_rect", f_set_clip_rect },
{ "draw_rect", f_draw_rect },
{ "draw_text", f_draw_text },
{ "draw_text_subpixel", f_draw_text_subpixel },
{ NULL, NULL }
};
int luaopen_renderer_font(lua_State *L);
int luaopen_renderer_replacements(lua_State *L);
static const luaL_Reg fontLib[] = {
{ "__gc", f_font_gc },
{ "load", f_font_load },
{ "copy", f_font_copy },
{ "set_tab_size", f_font_set_tab_size },
{ "get_width", f_font_get_width },
{ "get_height", f_font_get_height },
{ "get_size", f_font_get_size },
{ NULL, NULL }
};
int luaopen_renderer(lua_State *L) {
luaL_newlib(L, lib);
luaopen_renderer_font(L);
luaL_newmetatable(L, API_TYPE_FONT);
luaL_setfuncs(L, fontLib, 0);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_setfield(L, -2, "font");
luaopen_renderer_replacements(L);
lua_setfield(L, -2, "replacements");
return 1;
}

158
src/api/renderer_font.c
View File

@ -1,158 +0,0 @@
#include <lua.h>
#include <lauxlib.h>
#include "api.h"
#include "fontdesc.h"
#include "renderer.h"
#include "rencache.h"
static int f_load(lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
float size = luaL_checknumber(L, 2);
unsigned int font_options = 0;
if (lua_gettop(L) > 2 && lua_istable(L, 3)) {
lua_getfield(L, 3, "antialiasing");
if (lua_isstring(L, -1)) {
const char *antialiasing = lua_tostring(L, -1);
if (antialiasing) {
if (strcmp(antialiasing, "grayscale") == 0) {
font_options |= RenFontGrayscale;
} else if (strcmp(antialiasing, "subpixel") == 0) {
font_options |= RenFontSubpixel;
} else {
return luaL_error(L, "error in renderer.font.load, unknown antialiasing option: \"%s\"", antialiasing);
}
}
}
lua_pop(L, 1);
lua_getfield(L, 3, "hinting");
if (lua_isstring(L, -1)) {
const char *hinting = lua_tostring(L, -1);
if (hinting) {
if (strcmp(hinting, "slight") == 0) {
font_options |= RenFontHintingSlight;
} else if (strcmp(hinting, "none") == 0) {
font_options |= RenFontHintingNone;
} else if (strcmp(hinting, "full") == 0) {
font_options |= RenFontHintingFull;
} else {
return luaL_error(L, "error in renderer.font.load, unknown hinting option: \"%s\"", hinting);
}
}
}
lua_pop(L, 1);
}
if (ren_verify_font(filename)) {
luaL_error(L, "failed to load font");
}
FontDesc *font_desc = lua_newuserdata(L, font_desc_alloc_size(filename));
font_desc_init(font_desc, filename, size, font_options);
luaL_setmetatable(L, API_TYPE_FONT);
return 1;
}
static int f_copy(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
float size;
if (lua_gettop(L) >= 2) {
size = luaL_checknumber(L, 2);
} else {
size = self->size;
}
FontDesc *new_font_desc = lua_newuserdata(L, font_desc_alloc_size(self->filename));
font_desc_init(new_font_desc, self->filename, size, self->options);
luaL_setmetatable(L, API_TYPE_FONT);
return 1;
}
static int f_set_tab_size(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
int n = luaL_checknumber(L, 2);
font_desc_set_tab_size(self, n);
return 0;
}
static int f_gc(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
font_desc_clear(self);
return 0;
}
static int f_get_width(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
const char *text = luaL_checkstring(L, 2);
/* By calling ren_get_font_width with NULL as third arguments
we will obtain the width in points. */
int w = ren_get_font_width(self, text, NULL);
lua_pushnumber(L, w);
return 1;
}
static int f_subpixel_scale(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
lua_pushnumber(L, ren_get_font_subpixel_scale(self));
return 1;
}
static int f_get_width_subpixel(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
const char *text = luaL_checkstring(L, 2);
int subpixel_scale;
/* We need to pass a non-null subpixel_scale pointer to force
subpixel width calculation. */
lua_pushnumber(L, ren_get_font_width(self, text, &subpixel_scale));
return 1;
}
static int f_get_height(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
lua_pushnumber(L, ren_get_font_height(self) );
return 1;
}
static int f_get_size(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
lua_pushnumber(L, self->size);
return 1;
}
static int f_set_size(lua_State *L) {
FontDesc *self = luaL_checkudata(L, 1, API_TYPE_FONT);
float new_size = luaL_checknumber(L, 2);
font_desc_clear(self);
self->size = new_size;
return 0;
}
static const luaL_Reg lib[] = {
{ "__gc", f_gc },
{ "load", f_load },
{ "copy", f_copy },
{ "set_tab_size", f_set_tab_size },
{ "get_width", f_get_width },
{ "get_width_subpixel", f_get_width_subpixel },
{ "get_height", f_get_height },
{ "subpixel_scale", f_subpixel_scale },
{ "get_size", f_get_size },
{ "set_size", f_set_size },
{ NULL, NULL }
};
int luaopen_renderer_font(lua_State *L) {
luaL_newmetatable(L, API_TYPE_FONT);
luaL_setfuncs(L, lib, 0);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
return 1;
}

77
src/fontdesc.c
View File

@ -1,77 +0,0 @@
#include <stddef.h>
#include <stdlib.h>
#include "fontdesc.h"
#include "renderer.h"
int font_desc_alloc_size(const char *filename) {
return offsetof(FontDesc, filename) + strlen(filename) + 1;
}
void font_desc_init(FontDesc *font_desc, const char *filename, float size, unsigned int font_options) {
memcpy(font_desc->filename, filename, strlen(filename) + 1);
font_desc->size = size;
font_desc->options = font_options;
font_desc->tab_size = 4;
font_desc->cache_length = 0;
font_desc->cache_last_index = 0; /* Normally no need to initialize. */
}
void font_desc_clear(FontDesc *font_desc) {
for (int i = 0; i < font_desc->cache_length; i++) {
ren_free_font(font_desc->cache[i].font);
}
font_desc->cache_length = 0;
font_desc->cache_last_index = 0;
}
void font_desc_set_tab_size(FontDesc *font_desc, int tab_size) {
font_desc->tab_size = tab_size;
for (int i = 0; i < font_desc->cache_length; i++) {
ren_set_font_tab_size(font_desc->cache[i].font, tab_size);
}
}
int font_desc_get_tab_size(FontDesc *font_desc) {
return font_desc->tab_size;
}
static void load_scaled_font(FontDesc *font_desc, int index, int scale) {
RenFont *font = ren_load_font(font_desc->filename, scale * font_desc->size, font_desc->options);
if (!font) {
/* The font was able to load when initially loaded using renderer.load.font.
If now is no longer available we just abort the application. */
fprintf(stderr, "Fatal error: unable to load font %s. Application will abort.\n",
font_desc->filename);
exit(1);
}
font_desc->cache[index].font = font;
font_desc->cache[index].scale = scale;
}
RenFont *font_desc_get_font_at_scale(FontDesc *font_desc, int scale) {
int index = -1;
for (int i = 0; i < font_desc->cache_length; i++) {
if (font_desc->cache[i].scale == scale) {
index = i;
break;
}
}
if (index < 0) {
index = font_desc->cache_length;
if (index < FONT_CACHE_ARRAY_MAX) {
load_scaled_font(font_desc, index, scale);
font_desc->cache_length = index + 1;
} else {
// FIXME: should not print into the stderr or stdout.
fprintf(stderr, "Warning: max array of font scale reached.\n");
index = (font_desc->cache_last_index == 0 ? 1 : 0);
ren_free_font(font_desc->cache[index].font);
load_scaled_font(font_desc, index, scale);
}
}
font_desc->cache_last_index = index;
return font_desc->cache[index].font;
}

33
src/fontdesc.h
View File

@ -1,33 +0,0 @@
#ifndef FONT_DESC_H
#define FONT_DESC_H
typedef struct RenFont RenFont;
struct FontInstance {
RenFont *font;
short int scale;
};
typedef struct FontInstance FontInstance;
#define FONT_CACHE_ARRAY_MAX 2
struct FontDesc {
float size;
unsigned int options;
short int tab_size;
FontInstance cache[FONT_CACHE_ARRAY_MAX];
short int cache_length;
short int cache_last_index; /* More recently used instance. */
char filename[0];
};
typedef struct FontDesc FontDesc;
void font_desc_init(FontDesc *font_desc, const char *filename, float size, unsigned int font_options);
int font_desc_alloc_size(const char *filename);
int font_desc_get_tab_size(FontDesc *font_desc);
void font_desc_set_tab_size(FontDesc *font_desc, int tab_size);
void font_desc_clear(FontDesc *font_desc);
RenFont *font_desc_get_font_at_scale(FontDesc *font_desc, int scale);
#endif

85
src/rencache.c
View File

@ -16,32 +16,18 @@
#define COMMAND_BUF_SIZE (1024 * 512)
#define COMMAND_BARE_SIZE offsetof(Command, text)
enum { SET_CLIP, DRAW_TEXT, DRAW_RECT, DRAW_TEXT_SUBPIXEL };
enum { SET_CLIP, DRAW_TEXT, DRAW_RECT };
typedef struct {
int8_t type;
int8_t tab_size;
int8_t subpixel_scale;
int8_t x_subpixel_offset;
int32_t size;
RenRect rect;
RenColor color;
FontDesc *font_desc;
CPReplaceTable *replacements;
RenColor replace_color;
RenFont *font;
char text[0];
} Command;
#define FONT_REFS_MAX 12
struct FontRef {
FontDesc *font_desc;
int index;
};
typedef struct FontRef FontRef;
FontRef font_refs[FONT_REFS_MAX];
int font_refs_len = 0;
static unsigned cells_buf1[CELLS_X * CELLS_Y];
static unsigned cells_buf2[CELLS_X * CELLS_Y];
static unsigned *cells_prev = cells_buf1;
@ -52,36 +38,9 @@ static int command_buf_idx;
static RenRect screen_rect;
static bool show_debug;
static inline int min(int a, int b) { return a < b ? a : b; }
static inline int max(int a, int b) { return a > b ? a : b; }
static int font_refs_add(lua_State *L, FontDesc *font_desc, int index) {
for (int i = 0; i < font_refs_len; i++) {
if (font_refs[i].font_desc == font_desc) {
return font_refs[i].index;
}
}
if (font_refs_len >= FONT_REFS_MAX) {
fprintf(stderr, "Warning: (" __FILE__ "): exhausted font reference buffer\n");
return LUA_NOREF;
}
lua_pushvalue(L, index);
int ref = luaL_ref(L, LUA_REGISTRYINDEX);
font_refs[font_refs_len++] = (FontRef) { font_desc, ref };
return ref;
}
static void font_refs_clear(lua_State *L) {
for (int i = 0; i < font_refs_len; i++) {
luaL_unref(L, LUA_REGISTRYINDEX, font_refs[i].index);
}
font_refs_len = 0;
}
/* 32bit fnv-1a hash */
#define HASH_INITIAL 2166136261
@ -168,35 +127,21 @@ void rencache_draw_rect(RenRect rect, RenColor color) {
}
}
int rencache_draw_text(lua_State *L, FontDesc *font_desc, int font_index,
const char *text, int x, int y, RenColor color, bool draw_subpixel,
CPReplaceTable *replacements, RenColor replace_color)
int rencache_draw_text(lua_State *L, RenFont *font, const char *text, int x, int y, RenColor color)
{
int subpixel_scale;
int w_subpixel = ren_get_font_width(font_desc, text, &subpixel_scale);
RenRect rect;
rect.x = (draw_subpixel ? ren_font_subpixel_round(x, subpixel_scale, -1) : x);
rect.y = y;
rect.width = ren_font_subpixel_round(w_subpixel, subpixel_scale, 0);
rect.height = ren_get_font_height(font_desc);
if (rects_overlap(screen_rect, rect) && font_refs_add(L, font_desc, font_index) >= 0) {
RenRect rect = { x, y, ren_font_get_width(font, text), ren_font_get_height(font) };
if (rects_overlap(screen_rect, rect)) {
int sz = strlen(text) + 1;
Command *cmd = push_command(draw_subpixel ? DRAW_TEXT_SUBPIXEL : DRAW_TEXT, COMMAND_BARE_SIZE + sz);
Command *cmd = push_command(DRAW_TEXT, COMMAND_BARE_SIZE + sz);
if (cmd) {
memcpy(cmd->text, text, sz);
cmd->color = color;
cmd->font_desc = font_desc;
cmd->font = font;
cmd->rect = rect;
cmd->subpixel_scale = (draw_subpixel ? subpixel_scale : 1);
cmd->x_subpixel_offset = x - subpixel_scale * rect.x;
cmd->tab_size = font_desc_get_tab_size(font_desc);
cmd->replacements = replacements;
cmd->replace_color = replace_color;
cmd->tab_size = ren_font_get_tab_size(font);
}
}
return x + (draw_subpixel ? w_subpixel : rect.width);
return x + rect.width;
}
@ -214,7 +159,6 @@ void rencache_begin_frame(lua_State *L) {
screen_rect.height = h;
rencache_invalidate();
}
font_refs_clear(L);
}
@ -301,15 +245,8 @@ void rencache_end_frame(lua_State *L) {
ren_draw_rect(cmd->rect, cmd->color);
break;
case DRAW_TEXT:
font_desc_set_tab_size(cmd->font_desc, cmd->tab_size);
ren_draw_text(cmd->font_desc, cmd->text, cmd->rect.x, cmd->rect.y, cmd->color,
cmd->replacements, cmd->replace_color);
break;
case DRAW_TEXT_SUBPIXEL:
font_desc_set_tab_size(cmd->font_desc, cmd->tab_size);
ren_draw_text_subpixel(cmd->font_desc, cmd->text,
cmd->subpixel_scale * cmd->rect.x + cmd->x_subpixel_offset, cmd->rect.y, cmd->color,
cmd->replacements, cmd->replace_color);
ren_font_set_tab_size(cmd->font, cmd->tab_size);
ren_draw_text(cmd->font, cmd->text, cmd->rect.x, cmd->rect.y, cmd->color);
break;
}
}

4
src/rencache.h
View File

@ -8,8 +8,8 @@
void rencache_show_debug(bool enable);
void rencache_set_clip_rect(RenRect rect);
void rencache_draw_rect(RenRect rect, RenColor color);
int rencache_draw_text(lua_State *L, FontDesc *font_desc, int font_index, const char *text, int x, int y, RenColor color,
bool draw_subpixel, CPReplaceTable *replacements, RenColor replace_color);
int rencache_draw_text(lua_State *L, RenFont *font,
const char *text, int x, int y, RenColor color);
void rencache_invalidate(void);
void rencache_begin_frame(lua_State *L);
void rencache_end_frame(lua_State *L);

502
src/renderer.c
View File

@ -2,37 +2,21 @@
#include <stdbool.h>
#include <assert.h>
#include <math.h>
#include "font_renderer.h"
#include <ft2build.h>
#include <freetype/ftlcdfil.h>
#include <freetype/ftoutln.h>
#include FT_FREETYPE_H
#include "renderer.h"
#include "renwindow.h"
#define DIVIDE_BY_255_SIGNED(x, sign_val) (((x) + (sign_val) + ((x)>>8)) >> 8)
#define DIVIDE_BY_255(x) DIVIDE_BY_255_SIGNED(x, 1)
#define MAX_GLYPHSET 256
#define REPLACEMENT_CHUNK_SIZE 8
struct RenImage {
RenColor *pixels;
int width, height;
};
struct GlyphSet {
FR_Bitmap *image;
FR_Bitmap_Glyph_Metrics glyphs[256];
};
typedef struct GlyphSet GlyphSet;
/* The field "padding" below must be there just before GlyphSet *sets[MAX_GLYPHSET]
because the field "sets" can be indexed and writted with an index -1. For this
reason the "padding" field must be there but is never explicitly used. */
struct RenFont {
GlyphSet *padding;
GlyphSet *sets[MAX_GLYPHSET];
float size;
int height;
int space_advance;
FR_Renderer *renderer;
};
#define SUBPIXEL_BITMAPS_CACHED 3
static RenWindow window_renderer = {0};
static FT_Library library;
static void* check_alloc(void *ptr) {
if (!ptr) {
@ -42,6 +26,28 @@ static void* check_alloc(void *ptr) {
return ptr;
}
/************************* Fonts *************************/
typedef struct {
unsigned short x0, x1, y0, y1;
short bitmap_left, bitmap_top;
float xadvance;
} GlyphMetric;
typedef struct {
SDL_Surface* surface[SUBPIXEL_BITMAPS_CACHED];
GlyphMetric metrics[256];
} GlyphSet;
typedef struct RenFont {
FT_Face face;
GlyphSet* sets[MAX_GLYPHSET];
float size;
short max_height, space_advance, tab_advance;
bool subpixel;
ERenFontHinting hinting;
char path[0];
} RenFont;
static const char* utf8_to_codepoint(const char *p, unsigned *dst) {
unsigned res, n;
@ -59,213 +65,206 @@ static const char* utf8_to_codepoint(const char *p, unsigned *dst) {
return p + 1;
}
void ren_cp_replace_init(CPReplaceTable *rep_table) {
rep_table->size = 0;
rep_table->replacements = NULL;
static int font_set_load_options(RenFont* font) {
switch (font->hinting) {
case FONT_HINTING_SLIGHT: return FT_LOAD_TARGET_LIGHT | FT_LOAD_FORCE_AUTOHINT;
case FONT_HINTING_FULL: return FT_LOAD_TARGET_NORMAL | FT_LOAD_FORCE_AUTOHINT;
case FONT_HINTING_NONE: return FT_LOAD_TARGET_NORMAL | FT_LOAD_NO_HINTING;
}
return FT_LOAD_TARGET_NORMAL | FT_LOAD_NO_HINTING;
}
void ren_cp_replace_free(CPReplaceTable *rep_table) {
free(rep_table->replacements);
static int font_set_render_options(RenFont* font) {
if (font->subpixel) {
switch (font->hinting) {
case FONT_HINTING_NONE: FT_Library_SetLcdFilter(library, FT_LCD_FILTER_NONE); break;
case FONT_HINTING_SLIGHT: FT_Library_SetLcdFilter(library, FT_LCD_FILTER_LIGHT); break;
case FONT_HINTING_FULL: FT_Library_SetLcdFilter(library, FT_LCD_FILTER_DEFAULT); break;
}
void ren_cp_replace_add(CPReplaceTable *rep_table, const char *src, const char *dst) {
int table_size = rep_table->size;
if (table_size % REPLACEMENT_CHUNK_SIZE == 0) {
CPReplace *old_replacements = rep_table->replacements;
const int new_size = (table_size / REPLACEMENT_CHUNK_SIZE + 1) * REPLACEMENT_CHUNK_SIZE;
rep_table->replacements = malloc(new_size * sizeof(CPReplace));
if (!rep_table->replacements) {
rep_table->replacements = old_replacements;
return;
return FT_RENDER_MODE_LCD;
} else {
switch (font->hinting) {
case FONT_HINTING_NONE: return FT_RENDER_MODE_NORMAL; break;
case FONT_HINTING_SLIGHT: return FT_RENDER_MODE_LIGHT; break;
case FONT_HINTING_FULL: return FT_RENDER_MODE_LIGHT; break;
}
memcpy(rep_table->replacements, old_replacements, table_size * sizeof(CPReplace));
free(old_replacements);
}
CPReplace *rep = &rep_table->replacements[table_size];
utf8_to_codepoint(src, &rep->codepoint_src);
utf8_to_codepoint(dst, &rep->codepoint_dst);
rep_table->size = table_size + 1;
}
void ren_free_window_resources() {
renwin_free(&window_renderer);
}
void ren_init(SDL_Window *win) {
assert(win);
window_renderer.window = win;
renwin_init_surface(&window_renderer);
renwin_clip_to_surface(&window_renderer);
}
void ren_resize_window() {
renwin_resize_surface(&window_renderer);
}
void ren_update_rects(RenRect *rects, int count) {
static bool initial_frame = true;
if (initial_frame) {
renwin_show_window(&window_renderer);
initial_frame = false;
}
renwin_update_rects(&window_renderer, rects, count);
}
void ren_set_clip_rect(RenRect rect) {
renwin_set_clip_rect(&window_renderer, rect);
}
void ren_get_size(int *x, int *y) {
RenWindow *ren = &window_renderer;
const int scale = renwin_surface_scale(ren);
SDL_Surface *surface = renwin_get_surface(ren);
*x = surface->w / scale;
*y = surface->h / scale;
}
RenImage* ren_new_image(int width, int height) {
assert(width > 0 && height > 0);
RenImage *image = malloc(sizeof(RenImage) + width * height * sizeof(RenColor));
check_alloc(image);
image->pixels = (void*) (image + 1);
image->width = width;
image->height = height;
return image;
}
void ren_free_image(RenImage *image) {
free(image);
}
static GlyphSet* load_glyphset(RenFont *font, int idx) {
GlyphSet *set = check_alloc(calloc(1, sizeof(GlyphSet)));
set->image = FR_Bake_Font_Bitmap(font->renderer, font->height, idx << 8, 256, set->glyphs);
check_alloc(set->image);
return set;
}
static GlyphSet* get_glyphset(RenFont *font, int codepoint) {
int idx = (codepoint >> 8) % MAX_GLYPHSET;
if (!font->sets[idx]) {
font->sets[idx] = load_glyphset(font, idx);
}
return font->sets[idx];
}
int ren_verify_font(const char *filename) {
RenFont font[1];
font->renderer = FR_Renderer_New(0);
if (FR_Load_Font(font->renderer, filename)) {
return 1;
}
FR_Renderer_Free(font->renderer);
return 0;
}
static GlyphSet* font_load_glyphset(RenFont* font, int idx) {
GlyphSet* set = check_alloc(calloc(1, sizeof(GlyphSet)));
unsigned int render_option = font_set_render_options(font), load_option = font_set_load_options(font);
int pen_x = 0, bitmaps_cached = font->subpixel ? SUBPIXEL_BITMAPS_CACHED : 1;
unsigned int byte_width = font->subpixel ? 3 : 1;
for (int i = 0; i < 256; ++i) {
int glyph_index = FT_Get_Char_Index( font->face, i + idx * MAX_GLYPHSET);
if (!glyph_index || FT_Load_Glyph(font->face, glyph_index, load_option | FT_LOAD_BITMAP_METRICS_ONLY) || FT_Render_Glyph(font->face->glyph, render_option))
continue;
FT_GlyphSlot slot = font->face->glyph;
int glyph_width = slot->bitmap.width / byte_width;
set->metrics[i] = (GlyphMetric){ pen_x, pen_x + glyph_width, 0, slot->bitmap.rows, slot->bitmap_left, slot->bitmap_top, (slot->advance.x + slot->lsb_delta - slot->rsb_delta) / 64.0f};
pen_x += glyph_width;
font->max_height = slot->bitmap.rows > font->max_height ? slot->bitmap.rows : font->max_height;
// xadvance for some reason should be computed like this.
if (FT_Load_Glyph(font->face, glyph_index, FT_LOAD_BITMAP_METRICS_ONLY) || FT_Render_Glyph(font->face->glyph, render_option))
continue;
set->metrics[i].xadvance = (slot->advance.x + slot->lsb_delta - slot->rsb_delta) / 64.0f;
RenFont* ren_load_font(const char *filename, float size, unsigned int renderer_flags) {
RenFont *font = NULL;
/* init font */
font = check_alloc(calloc(1, sizeof(RenFont)));
font->size = size;
unsigned int fr_renderer_flags = 0;
if ((renderer_flags & RenFontAntialiasingMask) == RenFontSubpixel) {
fr_renderer_flags |= FR_SUBPIXEL;
}
if ((renderer_flags & RenFontHintingMask) == RenFontHintingSlight) {
fr_renderer_flags |= (FR_HINTING | FR_PRESCALE_X);
} else if ((renderer_flags & RenFontHintingMask) == RenFontHintingFull) {
fr_renderer_flags |= FR_HINTING;
for (int j = 0; j < bitmaps_cached; ++j) {
set->surface[j] = check_alloc(SDL_CreateRGBSurface(0, pen_x, font->max_height, font->subpixel ? 24 : 8, 0, 0, 0, 0));
unsigned char* pixels = set->surface[j]->pixels;
for (int i = 0; i < 256; ++i) {
int glyph_index = FT_Get_Char_Index(font->face, i + idx * MAX_GLYPHSET);
if (!glyph_index || FT_Load_Glyph(font->face, glyph_index, load_option))
continue;
FT_GlyphSlot slot = font->face->glyph;
FT_Outline_Translate(&slot->outline, (64 / bitmaps_cached) * j, 0 );
if (FT_Render_Glyph(slot, render_option))
continue;
for (int line = 0; line < slot->bitmap.rows; ++line) {
int target_offset = set->surface[j]->pitch * line + set->metrics[i].x0 * byte_width;
int source_offset = line * slot->bitmap.pitch;
memcpy(&pixels[target_offset], &slot->bitmap.buffer[source_offset], slot->bitmap.width);
}
font->renderer = FR_Renderer_New(fr_renderer_flags);
if (FR_Load_Font(font->renderer, filename)) {
free(font);
return NULL;
}
font->height = FR_Get_Font_Height(font->renderer, size);
FR_Bitmap_Glyph_Metrics *gs = get_glyphset(font, ' ')->glyphs;
font->space_advance = gs[' '].xadvance;
/* make tab and newline glyphs invisible */
FR_Bitmap_Glyph_Metrics *g = get_glyphset(font, '\n')->glyphs;
g['\t'].x1 = g['\t'].x0;
g['\n'].x1 = g['\n'].x0;
return font;
}
return set;
}
void ren_free_font(RenFont *font) {
for (int i = 0; i < MAX_GLYPHSET; i++) {
GlyphSet *set = font->sets[i];
if (set) {
FR_Bitmap_Free(set->image);
static void font_free_glyphset(GlyphSet* set) {
for (int i = 0; i < SUBPIXEL_BITMAPS_CACHED; ++i) {
if (set->surface[i])
SDL_FreeSurface(set->surface[i]);
}
free(set);
}
static GlyphSet* font_get_glyphset(RenFont* font, int codepoint) {
int idx = (codepoint >> 8) % MAX_GLYPHSET;
if (!font->sets[idx])
font->sets[idx] = font_load_glyphset(font, idx);
return font->sets[idx];
}
FR_Renderer_Free(font->renderer);
RenFont* ren_font_load(const char* path, float size, bool subpixel, unsigned char hinting) {
FT_Face face;
if (FT_New_Face( library, path, 0, &face))
return NULL;
if (FT_Set_Pixel_Sizes(face, 0, (int)size))
goto failure;
int len = strlen(path);
RenFont* font = check_alloc(calloc(1, sizeof(RenFont) + len + 1));
strcpy(font->path, path);
font->face = face;
font->size = size;
font->subpixel = subpixel;
font->hinting = hinting;
GlyphSet* set = font_get_glyphset(font, ' ');
font->space_advance = (int)set->metrics[' '].xadvance;
font->tab_advance = font->space_advance * 2;
return font;
failure:
FT_Done_Face(face);
return NULL;
}
RenFont* ren_font_copy(RenFont* font, float size) {
return ren_font_load(font->path, size, font->subpixel, font->hinting);
}
void ren_font_free(RenFont* font) {
for (int i = 0; i < MAX_GLYPHSET; ++i) {
if (font->sets[i])
font_free_glyphset(font->sets[i]);
}
FT_Done_Face(font->face);
free(font);
}
void ren_set_font_tab_size(RenFont *font, int n) {
GlyphSet *set = get_glyphset(font, '\t');
set->glyphs['\t'].xadvance = font->space_advance * n;
void ren_font_set_tab_size(RenFont *font, int n) {
font_get_glyphset(font, '\t')->metrics['\t'].xadvance = font->space_advance * n;
}
int ren_get_font_tab_size(RenFont *font) {
GlyphSet *set = get_glyphset(font, '\t');
return set->glyphs['\t'].xadvance / font->space_advance;
int ren_font_get_tab_size(RenFont *font) {
return font_get_glyphset(font, '\t')->metrics['\t'].xadvance / font->space_advance;
}
/* Important: if subpixel_scale is NULL we will return width in points. Otherwise we will
return width in subpixels. */
int ren_get_font_width(FontDesc *font_desc, const char *text, int *subpixel_scale) {
int x = 0;
const char *p = text;
unsigned codepoint;
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
while (*p) {
p = utf8_to_codepoint(p, &codepoint);
GlyphSet *set = get_glyphset(font, codepoint);
FR_Bitmap_Glyph_Metrics *g = &set->glyphs[codepoint & 0xff];
x += g->xadvance;
int ren_font_get_width(RenFont *font, const char *text) {
int width = 0;
const char* end = text + strlen(text);
while (text < end) {
unsigned int codepoint;
text = utf8_to_codepoint(text, &codepoint);
width += font_get_glyphset(font, codepoint)->metrics[codepoint % 256].xadvance;
}
/* At this point here x is in subpixel units */
const int x_scale_to_points = FR_Subpixel_Scale(font->renderer) * surface_scale;
if (subpixel_scale) {
*subpixel_scale = x_scale_to_points;
return x;
}
return (x + x_scale_to_points / 2) / x_scale_to_points;
return width;
}
int ren_get_font_height(FontDesc *font_desc) {
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
return (font->height + surface_scale / 2) / surface_scale;
float ren_font_get_size(RenFont *font) {
return font->size;
}
int ren_font_get_height(RenFont *font) {
return font->size + 3;
}
int ren_draw_text(RenFont *font, const char *text, float x, int y, RenColor color) {
SDL_Surface *surface = renwin_get_surface(&window_renderer);
const RenRect clip = window_renderer.clip;
float pen_x = x;
int bytes_per_pixel = surface->format->BytesPerPixel;
const char* end = text + strlen(text);
unsigned char* destination_pixels = surface->pixels;
int clip_end_x = clip.x + clip.width, clip_end_y = clip.y + clip.height;
while (text < end) {
unsigned int codepoint, r, g, b;
text = utf8_to_codepoint(text, &codepoint);
GlyphSet* set = font_get_glyphset(font, codepoint);
GlyphMetric* metric = &set->metrics[codepoint % 256];
int bitmap_index = font->subpixel ? (int)(fmod(pen_x, 1.0) * SUBPIXEL_BITMAPS_CACHED) : 0;
unsigned char* source_pixels = set->surface[bitmap_index]->pixels;
int start_x = pen_x + metric->bitmap_left, endX = metric->x1 - metric->x0 + pen_x;
int glyph_end = metric->x1, glyphStart = metric->x0;
if (color.a > 0 && endX >= clip.x && start_x <= clip_end_x) {
for (int line = metric->y0; line < metric->y1; ++line) {
int targetY = line + y - metric->y0 - metric->bitmap_top + font->size;
if (targetY < clip.y)
continue;
if (targetY >= clip_end_y)
break;
unsigned int* destination_pixel = (unsigned int*)&destination_pixels[surface->pitch * targetY + start_x * bytes_per_pixel];
unsigned char* source_pixel = &source_pixels[line * set->surface[bitmap_index]->pitch + metric->x0 * (font->subpixel ? 3 : 1)];
for (int x = glyphStart; x < glyph_end; ++x) {
unsigned int destination_color = *destination_pixel;
SDL_Color dst = { (destination_color >> 16) & 0xFF, (destination_color >> 8) & 0xFF, (destination_color >> 0) & 0xFF, (destination_color >> 24) & 0xFF };
if (font->subpixel) {
SDL_Color src = { *source_pixel++, *source_pixel++, *source_pixel++ };
r = color.r * src.r + dst.r * (255 - src.r) + 127;
r = DIVIDE_BY_255(r);
g = color.g * src.g + dst.g * (255 - src.g) + 127;
g = DIVIDE_BY_255(g);
b = color.b * src.b + dst.b * (255 - src.b) + 127;
b = DIVIDE_BY_255(b);
} else {
unsigned char intensity = *source_pixel++;
r = color.r * intensity + dst.r * (255 - intensity) + 127;
r = DIVIDE_BY_255(r);
g = color.g * intensity + dst.g * (255 - intensity) + 127;
g = DIVIDE_BY_255(g);
b = color.b * intensity + dst.b * (255 - intensity) + 127;
b = DIVIDE_BY_255(b);
}
*destination_pixel++ = dst.a << 24 | r << 16 | g << 8 | b;
}
}
}
pen_x += metric->xadvance ? metric->xadvance : font->space_advance;
}
return pen_x;
}
/******************* Rectangles **********************/
static inline RenColor blend_pixel(RenColor dst, RenColor src) {
int ia = 0xff - src.a;
dst.r = ((src.r * src.a) + (dst.r * ia)) >> 8;
@ -316,88 +315,49 @@ void ren_draw_rect(RenRect rect, RenColor color) {
}
}
/*************** Window Management ****************/
void ren_free_window_resources() {
renwin_free(&window_renderer);
}
static int codepoint_replace(CPReplaceTable *rep_table, unsigned *codepoint) {
for (int i = 0; i < rep_table->size; i++) {
const CPReplace *rep = &rep_table->replacements[i];
if (*codepoint == rep->codepoint_src) {
*codepoint = rep->codepoint_dst;
return 1;
void ren_init(SDL_Window *win) {
assert(win);
int error = FT_Init_FreeType( &library );
if ( error ) {
fprintf(stderr, "internal font error when starting the application\n");
return;
}
}
return 0;
window_renderer.window = win;
renwin_init_surface(&window_renderer);
renwin_clip_to_surface(&window_renderer);
}
static FR_Clip_Area clip_area_from_rect(const RenRect r) {
return (FR_Clip_Area) {r.x, r.y, r.x + r.width, r.y + r.height};
void ren_resize_window() {
renwin_resize_surface(&window_renderer);
}
static void draw_text_impl(RenFont *font, const char *text, int x_subpixel, int y_pixel, RenColor color,
CPReplaceTable *replacements, RenColor replace_color)
{
SDL_Surface *surf = renwin_get_surface(&window_renderer);
FR_Clip_Area clip = clip_area_from_rect(window_renderer.clip);
const char *p = text;
unsigned codepoint;
const FR_Color color_fr = { .r = color.r, .g = color.g, .b = color.b };
while (*p) {
FR_Color color_rep;
p = utf8_to_codepoint(p, &codepoint);
GlyphSet *set = get_glyphset(font, codepoint);
FR_Bitmap_Glyph_Metrics *g = &set->glyphs[codepoint & 0xff];
const int xadvance_original_cp = g->xadvance;
const int replaced = replacements ? codepoint_replace(replacements, &codepoint) : 0;
if (replaced) {
set = get_glyphset(font, codepoint);
g = &set->glyphs[codepoint & 0xff];
color_rep = (FR_Color) { .r = replace_color.r, .g = replace_color.g, .b = replace_color.b};
} else {
color_rep = color_fr;
}
if (color.a != 0) {
FR_Blend_Glyph(font->renderer, &clip,
x_subpixel, y_pixel, (uint8_t *) surf->pixels, surf->w, set->image, g, color_rep);
}
x_subpixel += xadvance_original_cp;
void ren_update_rects(RenRect *rects, int count) {
static bool initial_frame = true;
if (initial_frame) {
renwin_show_window(&window_renderer);
initial_frame = false;
}
renwin_update_rects(&window_renderer, rects, count);
}
void ren_draw_text_subpixel(FontDesc *font_desc, const char *text, int x_subpixel, int y, RenColor color,
CPReplaceTable *replacements, RenColor replace_color)
{
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
draw_text_impl(font, text, x_subpixel, surface_scale * y, color, replacements, replace_color);
}
void ren_draw_text(FontDesc *font_desc, const char *text, int x, int y, RenColor color,
CPReplaceTable *replacements, RenColor replace_color)
{
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
const int subpixel_scale = surface_scale * FR_Subpixel_Scale(font->renderer);
draw_text_impl(font, text, subpixel_scale * x, surface_scale * y, color, replacements, replace_color);
}
// Could be declared as static inline
int ren_font_subpixel_round(int width, int subpixel_scale, int orientation) {
int w_mult;
if (orientation < 0) {
w_mult = width;
} else if (orientation == 0) {
w_mult = width + subpixel_scale / 2;
} else {
w_mult = width + subpixel_scale - 1;
}
return w_mult / subpixel_scale;
void ren_set_clip_rect(RenRect rect) {
renwin_set_clip_rect(&window_renderer, rect);
}
int ren_get_font_subpixel_scale(FontDesc *font_desc) {
const int surface_scale = renwin_surface_scale(&window_renderer);
RenFont *font = font_desc_get_font_at_scale(font_desc, surface_scale);
return FR_Subpixel_Scale(font->renderer) * surface_scale;
void ren_get_size(int *x, int *y) {
RenWindow *ren = &window_renderer;
const int scale = renwin_surface_scale(ren);
SDL_Surface *surface = renwin_get_surface(ren);
*x = surface->w / scale;
*y = surface->h / scale;
}

61
src/renderer.h
View File

@ -3,37 +3,24 @@
#include <SDL.h>
#include <stdint.h>
#include "fontdesc.h"
typedef struct RenImage RenImage;
enum {
RenFontAntialiasingMask = 1,
RenFontGrayscale = 1,
RenFontSubpixel = 0,
RenFontHintingMask = 3 << 1,
RenFontHintingSlight = 0 << 1,
RenFontHintingNone = 1 << 1,
RenFontHintingFull = 2 << 1,
};
#include <stdbool.h>
typedef struct RenFont RenFont;
typedef enum { FONT_HINTING_NONE, FONT_HINTING_SLIGHT, FONT_HINTING_FULL } ERenFontHinting;
typedef struct { uint8_t b, g, r, a; } RenColor;
typedef struct { int x, y, width, height; } RenRect;
struct CPReplace {
unsigned codepoint_src;
unsigned codepoint_dst;
};
typedef struct CPReplace CPReplace;
struct CPReplaceTable {
int size;
CPReplace *replacements;
};
typedef struct CPReplaceTable CPReplaceTable;
RenFont* ren_font_load(const char *filename, float size, bool subpixel, unsigned char hinting);
RenFont* ren_font_copy(RenFont* font, float size);
void ren_font_free(RenFont *font);
void ren_font_set_tab_size(RenFont *font, int n);
int ren_font_get_tab_size(RenFont *font);
int ren_font_get_width(RenFont *font, const char *text);
int ren_font_get_height(RenFont *font);
float ren_font_get_size(RenFont *font);
int ren_draw_text(RenFont *font, const char *text, float x, int y, RenColor color);
void ren_draw_rect(RenRect rect, RenColor color);
void ren_init(SDL_Window *win);
void ren_resize_window();
@ -42,27 +29,5 @@ void ren_set_clip_rect(RenRect rect);
void ren_get_size(int *x, int *y); /* Reports the size in points. */
void ren_free_window_resources();
RenImage* ren_new_image(int width, int height);
void ren_free_image(RenImage *image);
RenFont* ren_load_font(const char *filename, float size, unsigned int renderer_flags);
int ren_verify_font(const char *filename);
void ren_free_font(RenFont *font);
void ren_set_font_tab_size(RenFont *font, int n);
int ren_get_font_tab_size(RenFont *font);
int ren_get_font_width(FontDesc *font_desc, const char *text, int *subpixel_scale);
int ren_get_font_height(FontDesc *font_desc);
int ren_get_font_subpixel_scale(FontDesc *font_desc);
int ren_font_subpixel_round(int width, int subpixel_scale, int orientation);
void ren_draw_rect(RenRect rect, RenColor color);
void ren_draw_text(FontDesc *font_desc, const char *text, int x, int y, RenColor color, CPReplaceTable *replacements, RenColor replace_color);
void ren_draw_text_subpixel(FontDesc *font_desc, const char *text, int x_subpixel, int y, RenColor color, CPReplaceTable *replacements, RenColor replace_color);
void ren_cp_replace_init(CPReplaceTable *rep_table);
void ren_cp_replace_free(CPReplaceTable *rep_table);
void ren_cp_replace_add(CPReplaceTable *rep_table, const char *src, const char *dst);
void ren_cp_replace_clear(CPReplaceTable *rep_table);
#endif