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WIP: compiles but completely broken 

AGG files imported from AGG repository, sdl-testing branch.

the pixfmt_bgra32_lcd is just implemented and is not tested.
This commit is contained in:
Francesco Abbate 2020-05-28 12:15:24 +02:00
parent 79487074c0
commit 23a080ca45
11 changed files with 2127 additions and 2 deletions
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4
meson.build
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@ -1,4 +1,4 @@
project('lite', 'c', version: '1.05', default_options : ['c_std=gnu11'])
project('lite', 'c', 'cpp', version: '1.05', default_options : ['c_std=gnu11', 'cpp_std=c++03'])
cc = meson.get_compiler('c')
libm = cc.find_library('m', required : false)
@ -6,6 +6,8 @@ libdl = cc.find_library('dl', required : false)
lua_dep = dependency('lua')
sdl_dep = dependency('sdl2', method: 'config-tool')
libagg_dep = dependency('libagg')
freetype_dep = dependency('freetype2')
stb_truetype_dep = dependency('stb_truetype')
lite_include = include_directories('src')

34
notes.txt Normal file
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stbtt_InitFont
stbtt_ScaleForMappingEmToPixels x 3
stbtt_ScaleForPixelHeight
stbtt_BakeFontBitmap
stbtt_GetFontVMetrics x 2
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;
};
typedef struct {
unsigned short x0, y0, x1, y1; // coordinates of bbox in bitmap
float xoff, yoff, xadvance;
} stbtt_bakedchar;
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.

1149
src/agg_font_freetype.cpp Normal file
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196
src/agg_font_freetype.h Normal file
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//----------------------------------------------------------------------------
// 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;
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

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src/agg_pixfmt_bgra32_lcd.h Normal file
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//----------------------------------------------------------------------------
// Anti-Grain Geometry (AGG) - Version 2.5
// A high quality rendering engine for C++
// Copyright (C) 2002-2006 Maxim Shemanarev
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://antigrain.com
//
// AGG is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// AGG is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with AGG; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301, USA.
//----------------------------------------------------------------------------
#ifndef AGG_PIXFMT_BGRA32_LCD_INCLUDED
#define AGG_PIXFMT_BGRA32_LCD_INCLUDED
#include <string.h>
#include "agg_basics.h"
#include "agg_color_rgba.h"
#include "agg_rendering_buffer.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 = 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];
};
//========================================================pixfmt_bgra32_lcd
class pixfmt_bgra32_lcd
{
public:
typedef rgba8 color_type;
typedef rendering_buffer::row_data row_data;
typedef color_type::value_type value_type;
typedef color_type::calc_type calc_type;
//--------------------------------------------------------------------
pixfmt_bgra32_lcd(rendering_buffer& rb, const lcd_distribution_lut& lut)
: m_rbuf(&rb), m_lut(&lut)
{
}
//--------------------------------------------------------------------
unsigned width() const {
return m_rbuf->width() * 3;
}
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)
{
int8u* p = m_rbuf->row_ptr(y) + (x / 3) * 4;
for (int ilen = len; ilen > 0; p += 4, ilen -= 3)
{
p[0] = c.b;
p[1] = c.g;
p[2] = c.r;
p[3] = 0xff;
}
}
//--------------------------------------------------------------------
void blend_solid_hspan(int x, int y,
unsigned len,
const color_type& c,
const int8u* covers)
{
unsigned rowlen = width();
int cx = (x - 2 >= 0 ? -2 : -x);
int cx_max = (len + 2 <= rowlen ? len + 1 : rowlen - 1);
int i = (x + cx) % 3;
const int8u rgb[3] = { c.r, c.g, c.b };
int8u* p = m_rbuf->row_ptr(y) + (x + cx);
const int pixel_index[3] = {2, 1, 0};
for (/* */; cx <= cx_max; cx += 3)
{
unsigned c_conv, alpha, dst_col, src_col;
c_conv = m_lut->convolution(covers, cx, 0, len - 1);
alpha = (c_conv + 1) * (c.a + 1);
dst_col = rgb[i];
src_col = *(p + pixel_index[i]);
*(p + pixel_index[i]) = (int8u)((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
i = (i + 1) % 3;
c_conv = m_lut->convolution(covers, cx + 1, 0, len - 1);
alpha = (c_conv + 1) * (c.a + 1);
dst_col = rgb[i];
src_col = *(p + pixel_index[i]);
*(p + pixel_index[i]) = (int8u)((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
i = (i + 1) % 3;
c_conv = m_lut->convolution(covers, cx + 2, 0, len - 1);
alpha = (c_conv + 1) * (c.a + 1);
dst_col = rgb[i];
src_col = *(p + pixel_index[i]);
*(p + pixel_index[i]) = (int8u)((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
i = (i + 1) % 3;
p[3] = 0xff;
p += 4;
}
}
private:
rendering_buffer* m_rbuf;
const lcd_distribution_lut* m_lut;
};
template <class Gamma>
class pixfmt_bgra32_lcd_gamma
{
public:
typedef rgba8 color_type;
typedef rendering_buffer::row_data row_data;
typedef color_type::value_type value_type;
typedef color_type::calc_type calc_type;
//--------------------------------------------------------------------
pixfmt_bgra32_lcd_gamma(rendering_buffer& rb, const lcd_distribution_lut& lut, const Gamma& gamma)
: m_rbuf(&rb), m_lut(&lut), m_gamma(gamma)
{
}
//--------------------------------------------------------------------
unsigned width() const {
return m_rbuf->width() * 3;
}
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)
{
int8u* p = m_rbuf->row_ptr(y) + (x / 3) * 4;
for (int ilen = len; ilen > 0; p += 4, ilen -= 3)
{
p[0] = c.r;
p[1] = c.g;
p[2] = c.b;
p[3] = 0xff;
}
}
//--------------------------------------------------------------------
void blend_solid_hspan(int x, int y,
unsigned len,
const color_type& c,
const int8u* covers)
{
unsigned rowlen = width();
int cx = (x - 2 >= 0 ? -2 : -x);
int cx_max = (len + 2 <= rowlen ? len + 1 : rowlen - 1);
int i = (x + cx) % 3;
const int8u rgb[3] = { c.r, c.g, c.b };
int8u* p = m_rbuf->row_ptr(y) + (x + cx);
const int pixel_index[3] = {2, 1, 0};
for (/* */; cx <= cx_max; cx += 3)
{
unsigned c_conv, alpha, dst_col, src_col;
c_conv = m_lut->convolution(covers, cx, 0, len - 1);
alpha = (c_conv + 1) * (c.a + 1);
dst_col = m_gamma.dir(rgb[i]);
src_col = m_gamma.dir(*(p + pixel_index[i]));
*(p + pixel_index[i]) = m_gamma.inv((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
i = (i + 1) % 3;
c_conv = m_lut->convolution(covers, cx + 1, 0, len - 1);
alpha = (c_conv + 1) * (c.a + 1);
dst_col = m_gamma.dir(rgb[i]);
src_col = m_gamma.dir(*(p + pixel_index[i]));
*(p + pixel_index[i]) = m_gamma.inv((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
i = (i + 1) % 3;
c_conv = m_lut->convolution(covers, cx + 2, 0, len - 1);
alpha = (c_conv + 1) * (c.a + 1);
dst_col = m_gamma.dir(rgb[i]);
src_col = m_gamma.dir(*(p + pixel_index[i]));
*(p + pixel_index[i]) = m_gamma.inv((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
i = (i + 1) % 3;
p[3] = 0xff;
p += 4;
}
}
private:
rendering_buffer* m_rbuf;
const lcd_distribution_lut* m_lut;
const Gamma& m_gamma;
};
}
#endif

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src/agg_pixfmt_rgb24_lcd.h Normal file
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//----------------------------------------------------------------------------
// Anti-Grain Geometry (AGG) - Version 2.5
// A high quality rendering engine for C++
// Copyright (C) 2002-2006 Maxim Shemanarev
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://antigrain.com
//
// AGG is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// AGG is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with AGG; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301, USA.
//----------------------------------------------------------------------------
#ifndef AGG_PIXFMT_RGB24_LCD_INCLUDED
#define AGG_PIXFMT_RGB24_LCD_INCLUDED
#include <string.h>
#include "agg_basics.h"
#include "agg_color_rgba.h"
#include "agg_rendering_buffer.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 = 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];
};
//========================================================pixfmt_rgb24_lcd
class pixfmt_rgb24_lcd
{
public:
typedef rgba8 color_type;
typedef rendering_buffer::row_data row_data;
typedef color_type::value_type value_type;
typedef color_type::calc_type calc_type;
//--------------------------------------------------------------------
pixfmt_rgb24_lcd(rendering_buffer& rb, const lcd_distribution_lut& lut)
: m_rbuf(&rb), m_lut(&lut)
{
}
//--------------------------------------------------------------------
unsigned width() const {
return m_rbuf->width() * 3;
}
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)
{
int xr = x - (x % 3);
int8u* p = m_rbuf->row_ptr(y) + xr;
for (int ilen = len; ilen > 0; p += 3, ilen -= 3)
{
p[0] = c.r;
p[1] = c.g;
p[2] = c.b;
}
}
//--------------------------------------------------------------------
void blend_solid_hspan(int x, int y,
unsigned len,
const color_type& c,
const int8u* covers)
{
unsigned rowlen = width();
int cx = (x - 2 >= 0 ? -2 : -x);
int cx_max = (len + 2 <= rowlen ? len + 1 : rowlen - 1);
int i = (x + cx) % 3;
int8u rgb[3] = { c.r, c.g, c.b };
int8u* p = m_rbuf->row_ptr(y) + (x + cx);
for (/* */; cx <= cx_max; cx++)
{
unsigned c_conv = m_lut->convolution(covers, cx, 0, len - 1);
unsigned alpha = (c_conv + 1) * (c.a + 1);
unsigned dst_col = rgb[i], src_col = (*p);
*p = (int8u)((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
p ++;
i = (i + 1) % 3;
}
}
private:
rendering_buffer* m_rbuf;
const lcd_distribution_lut* m_lut;
};
template <class Gamma>
class pixfmt_rgb24_lcd_gamma
{
public:
typedef rgba8 color_type;
typedef rendering_buffer::row_data row_data;
typedef color_type::value_type value_type;
typedef color_type::calc_type calc_type;
//--------------------------------------------------------------------
pixfmt_rgb24_lcd_gamma(rendering_buffer& rb, const lcd_distribution_lut& lut, const Gamma& gamma)
: m_rbuf(&rb), m_lut(&lut), m_gamma(gamma)
{
}
//--------------------------------------------------------------------
unsigned width() const {
return m_rbuf->width() * 3;
}
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)
{
int xr = x - (x % 3);
int8u* p = m_rbuf->row_ptr(y) + xr;
for (int ilen = len; ilen > 0; p += 3, ilen -= 3)
{
p[0] = c.r;
p[1] = c.g;
p[2] = c.b;
}
}
//--------------------------------------------------------------------
void blend_solid_hspan(int x, int y,
unsigned len,
const color_type& c,
const int8u* covers)
{
unsigned rowlen = width();
int cx = (x - 2 >= 0 ? -2 : -x);
int cx_max = (len + 2 <= rowlen ? len + 1 : rowlen - 1);
int i = (x + cx) % 3;
int8u rgb[3] = { c.r, c.g, c.b };
int8u* p = m_rbuf->row_ptr(y) + (x + cx);
for (/* */; cx <= cx_max; cx++)
{
unsigned c_conv = m_lut->convolution(covers, cx, 0, len - 1);
unsigned alpha = (c_conv + 1) * (c.a + 1);
unsigned dst_col = m_gamma.dir(rgb[i]), src_col = m_gamma.dir(*p);
*p = m_gamma.inv((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
p ++;
i = (i + 1) % 3;
}
}
private:
rendering_buffer* m_rbuf;
const lcd_distribution_lut* m_lut;
const Gamma& m_gamma;
};
}
#endif

26
src/font_render_capi.cpp Normal file
View File

@ -0,0 +1,26 @@
#include "font_render_capi.h"
#include "font_render_lcd.h"
FontRenderer *FontRendererNew(unsigned int flags, float gamma) {
bool hinting = ((flags&FONT_RENDERER_HINTING) != 0);
bool kerning = ((flags&FONT_RENDERER_KERNING) != 0);
bool subpixel = ((flags&FONT_RENDERER_SUBPIXEL) != 0);
font_renderer_lcd *font_renderer = new font_renderer_lcd(hinting, kerning, subpixel, (double) gamma);
return (FontRenderer *) font_renderer;
}
int FontRendererLoadFont(FontRenderer *fr_, const char *filename) {
font_renderer_lcd *font_renderer = (font_renderer_lcd *) fr_;
bool success = font_renderer->load_font(filename);
return (success ? 0 : 1);
}
int FontRendererDrawText(FontRenderer *fr_, RenColor *pixels, int width, int height, int pitch, const char *text, float text_size, int x, int y, RenColor color) {
// FIXME: it works below as long as font_renderer_lcd use a BGRA32 pixel format
font_renderer_lcd *font_renderer = (font_renderer_lcd *) fr_;
agg::rendering_buffer ren_buf((agg::int8u *) pixels, width, height, -pitch);
const agg::rgba8 agg_color(color.r, color.g, color.b);
double new_x = font_renderer->render_text(ren_buf, (double) text_size, agg_color, (double) x, (double) y, text);
return int(new_x);
}

26
src/font_render_capi.h Normal file
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@ -0,0 +1,26 @@
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#include "renderer.h"
struct FontRenderer_;
typedef struct FontRenderer_ FontRenderer;
enum {
FONT_RENDERER_HINTING = 1 << 0,
FONT_RENDERER_KERNING = 1 << 1,
FONT_RENDERER_SUBPIXEL = 1 << 2,
FONT_RENDERER_DEFAULT = FONT_RENDERER_HINTING | FONT_RENDERER_KERNING | FONT_RENDERER_SUBPIXEL,
};
FontRenderer *FontRendererNew(unsigned int flags, float gamma);
int FontRendererLoadFont(FontRenderer *, const char *filename);
int FontRendererDrawText(FontRenderer *fr_, RenColor *pixels, int width, int height, int pitch, const char *text, float text_size, int x, int y, RenColor color);
#ifdef __cplusplus
}
#endif

166
src/font_render_lcd.h Normal file
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@ -0,0 +1,166 @@
#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_rgb.h"
#include "agg_pixfmt_rgba.h"
// #include "agg_pixfmt_rgb24_lcd.h"
#include "agg_pixfmt_bgra32_lcd.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"
// FIXME: the pixel type rgb24 of rgba32 is hard coded below
class font_renderer_lcd
{
typedef agg::pixfmt_bgra32 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;
agg::gamma_lut<> m_gamma_lut;
// Font rendering options.
bool m_hinting;
bool m_kerning;
bool m_grayscale;
double m_gamma;
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:
font_renderer_lcd(bool hinting, bool kerning, bool subpixel, double gamma):
m_feng(),
m_fman(m_feng),
m_hinting(hinting),
m_kerning(kerning),
m_grayscale(!subpixel),
m_gamma(gamma),
m_font_loaded(false),
m_curves(m_fman.path_adaptor()),
m_trans(m_curves, m_mtx)
{
m_gamma_lut.gamma(m_gamma);
}
bool load_font(const char *font_filename) {
if(m_feng.load_font(font_filename, 0, agg::glyph_ren_outline)) {
m_font_loaded = true;
}
return m_font_loaded;
}
template<class Rasterizer, class Scanline, class RenSolid>
double draw_text(Rasterizer& ras, Scanline& sl,
RenSolid& ren_solid, const agg::rgba8 color,
const char* text,
double x, double y, double height,
unsigned subpixel_scale)
{
const double scale_x = 100;
m_feng.height(height);
m_feng.width(height * scale_x * subpixel_scale);
m_feng.hinting(m_hinting);
const char* p = text;
// FIXME: check we need to multiply x by scale_x.
x *= scale_x * subpixel_scale;
double start_x = x;
while(*p)
{
if(*p == '\n')
{
x = start_x;
y -= height * 1.25;
++p;
continue;
}
const agg::glyph_cache* glyph = m_fman.glyph(*p);
if(glyph)
{
if(m_kerning)
{
m_fman.add_kerning(&x, &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(1.0 / scale_x, 1);
m_mtx *= agg::trans_affine_translation(start_x + x/scale_x, ty);
ras.add_path(m_trans);
ren_solid.color(color);
agg::render_scanlines(ras, sl, ren_solid);
}
// increment pen position
x += glyph->advance_x;
y += glyph->advance_y;
}
++p;
}
return x / (subpixel_scale * scale_x);
}
void clear(agg::rendering_buffer& ren_buf, const agg::rgba8 color) {
agg::pixfmt_bgra32 pf(ren_buf);
base_ren_type ren_base(pf);
ren_base.clear(color);
}
double render_text(agg::rendering_buffer& ren_buf,
const double text_size,
const agg::rgba8 text_color,
double x, double y,
const char *text)
{
if (!m_font_loaded) {
return y;
}
agg::scanline_u8 sl;
agg::rasterizer_scanline_aa<> ras;
ras.clip_box(0, 0, ren_buf.width()*3, ren_buf.height());
//--------------------------------------
if(m_grayscale)
{
agg::pixfmt_bgra32 pf(ren_buf);
base_ren_type ren_base(pf);
renderer_solid ren_solid(ren_base);
y = draw_text(ras, sl, ren_solid, text_color, text, x, y, text_size, 1);
}
else
{
// Conventional LUT values: (1./3., 2./9., 1./9.)
// The values below are fine tuned as in the Elementary Plot library.
// The primary weight should be 0.448 but is left adjustable.
agg::lcd_distribution_lut lut(0.448, 0.184, 0.092);
typedef agg::pixfmt_bgra32_lcd_gamma<agg::gamma_lut<> > pixfmt_lcd_type;
pixfmt_lcd_type pf_lcd(ren_buf, lut, m_gamma_lut);
agg::renderer_base<pixfmt_lcd_type> ren_base_lcd(pf_lcd);
agg::renderer_scanline_aa_solid<agg::renderer_base<pixfmt_lcd_type> > ren_solid_lcd(ren_base_lcd);
y = draw_text(ras, sl, ren_solid_lcd, text_color, text, x, y, text_size, 3);
}
return y;
}
};

4
src/meson.build
View File

@ -4,6 +4,8 @@ lite_sources = [
'api/renderer_font.c',
'api/system.c',
'renderer.c',
'agg_font_freetype.cpp',
'font_render_capi.cpp',
'rencache.c',
'main.c',
]
@ -11,7 +13,7 @@ lite_sources = [
executable('lite',
lite_sources,
include_directories: lite_include,
dependencies: [lua_dep, sdl_dep, stb_truetype_dep, libm, libdl],
dependencies: [lua_dep, sdl_dep, stb_truetype_dep, libagg_dep, freetype_dep, libm, libdl],
install: true,
gui_app: true,
)

12
src/renderer.c
View File

@ -4,6 +4,7 @@
#include <math.h>
#include "stb_truetype.h"
#include "renderer.h"
#include "font_render_capi.h"
#define MAX_GLYPHSET 256
@ -23,6 +24,7 @@ struct RenFont {
GlyphSet *sets[MAX_GLYPHSET];
float size;
int height;
FontRenderer *renderer;
};
@ -193,6 +195,10 @@ RenFont* ren_load_font(const char *filename, float size) {
g['\t'].x1 = g['\t'].x0;
g['\n'].x1 = g['\n'].x0;
font->renderer = FontRendererNew(FONT_RENDERER_HINTING|FONT_RENDERER_SUBPIXEL, 1.8);
// FIXME check for errors
FontRendererLoadFont(font->renderer, filename);
return font;
fail:
@ -328,6 +334,11 @@ void ren_draw_image(RenImage *image, RenRect *sub, int x, int y, RenColor color)
int ren_draw_text(RenFont *font, const char *text, int x, int y, RenColor color) {
SDL_Surface *surf = SDL_GetWindowSurface(window);
// FIXME: pixels are arranged in bgra order while AGG::fontrender use rgb
RenColor *pixels = (RenColor*) surf->pixels;
return FontRendererDrawText(font->renderer, pixels, surf->w, surf->h, surf->pitch, text, font->height, x, y, color);
#if 0
RenRect rect;
const char *p = text;
unsigned codepoint;
@ -343,4 +354,5 @@ int ren_draw_text(RenFont *font, const char *text, int x, int y, RenColor color)
x += g->xadvance;
}
return x;
#endif
}