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harfbuzz/util/helper-cairo.cc

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/*
* Copyright © 2011 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#include "helper-cairo.hh"
#include <cairo-ft.h>
#include <hb-ft.h>
#ifdef CAIRO_HAS_SVG_SURFACE
# include <cairo-svg.h>
#endif
#ifdef CAIRO_HAS_PDF_SURFACE
# include <cairo-pdf.h>
#endif
#ifdef CAIRO_HAS_PS_SURFACE
# include <cairo-ps.h>
# if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1,6,0)
# define HAS_EPS 1
static cairo_surface_t *
_cairo_eps_surface_create_for_stream (cairo_write_func_t write_func,
void *closure,
double width,
double height)
{
cairo_surface_t *surface;
surface = cairo_ps_surface_create_for_stream (write_func, closure, width, height);
cairo_ps_surface_set_eps (surface, TRUE);
return surface;
}
# else
# undef HAS_EPS
# endif
#endif
cairo_scaled_font_t *
helper_cairo_create_scaled_font (const font_options_t *font_opts,
double font_size)
{
hb_font_t *font = hb_font_reference (font_opts->get_font ());
cairo_font_face_t *cairo_face;
FT_Face ft_face = hb_ft_font_get_face (font);
if (!ft_face)
/* This allows us to get some boxes at least... */
cairo_face = cairo_toy_font_face_create ("@cairo:sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
else
cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
cairo_matrix_t ctm, font_matrix;
cairo_font_options_t *font_options;
cairo_matrix_init_identity (&ctm);
cairo_matrix_init_scale (&font_matrix,
font_size, font_size);
font_options = cairo_font_options_create ();
cairo_font_options_set_hint_style (font_options, CAIRO_HINT_STYLE_NONE);
cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
cairo_scaled_font_t *scaled_font = cairo_scaled_font_create (cairo_face,
&font_matrix,
&ctm,
font_options);
cairo_font_options_destroy (font_options);
cairo_font_face_destroy (cairo_face);
static cairo_user_data_key_t key;
if (cairo_scaled_font_set_user_data (scaled_font,
&key,
(void *) font,
(cairo_destroy_func_t) hb_font_destroy))
hb_font_destroy (font);
return scaled_font;
}
struct finalize_closure_t {
void (*callback)(finalize_closure_t *);
cairo_surface_t *surface;
cairo_write_func_t write_func;
void *closure;
};
static cairo_user_data_key_t finalize_closure_key;
#ifdef CAIRO_HAS_PNG_FUNCTIONS
static void
finalize_png (finalize_closure_t *closure)
{
cairo_status_t status;
status = cairo_surface_write_to_png_stream (closure->surface,
closure->write_func,
closure->closure);
if (status != CAIRO_STATUS_SUCCESS)
fail (FALSE, "Failed to write output: %s",
cairo_status_to_string (status));
}
static cairo_surface_t *
_cairo_png_surface_create_for_stream (cairo_write_func_t write_func,
void *closure,
double width,
double height,
cairo_content_t content)
{
cairo_surface_t *surface;
int w = ceil (width);
int h = ceil (height);
switch (content) {
case CAIRO_CONTENT_ALPHA:
surface = cairo_image_surface_create (CAIRO_FORMAT_A8, w, h);
break;
default:
case CAIRO_CONTENT_COLOR:
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, w, h);
break;
case CAIRO_CONTENT_COLOR_ALPHA:
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, w, h);
break;
}
cairo_status_t status = cairo_surface_status (surface);
if (status != CAIRO_STATUS_SUCCESS)
fail (FALSE, "Failed to create cairo surface: %s",
cairo_status_to_string (status));
finalize_closure_t *png_closure = g_new0 (finalize_closure_t, 1);
png_closure->callback = finalize_png;
png_closure->surface = surface;
png_closure->write_func = write_func;
png_closure->closure = closure;
if (cairo_surface_set_user_data (surface,
&finalize_closure_key,
(void *) png_closure,
(cairo_destroy_func_t) g_free))
g_free ((void *) closure);
return surface;
}
#endif
static cairo_status_t
stdio_write_func (void *closure,
const unsigned char *data,
unsigned int size)
{
FILE *fp = (FILE *) closure;
while (size) {
size_t ret = fwrite (data, 1, size, fp);
size -= ret;
data += ret;
if (size && ferror (fp))
fail (FALSE, "Failed to write output: %s", strerror (errno));
}
return CAIRO_STATUS_SUCCESS;
}
cairo_t *
helper_cairo_create_context (double w, double h,
view_options_t *view_opts,
output_options_t *out_opts)
{
cairo_surface_t *(*constructor) (cairo_write_func_t write_func,
void *closure,
double width,
double height) = NULL;
cairo_surface_t *(*constructor2) (cairo_write_func_t write_func,
void *closure,
double width,
double height,
cairo_content_t content) = NULL;
const char *extension = out_opts->output_format;
if (!extension)
extension = "png";
if (0)
;
#ifdef CAIRO_HAS_PNG_FUNCTIONS
else if (0 == strcasecmp (extension, "png"))
constructor2 = _cairo_png_surface_create_for_stream;
#endif
#ifdef CAIRO_HAS_SVG_SURFACE
else if (0 == strcasecmp (extension, "svg"))
constructor = cairo_svg_surface_create_for_stream;
#endif
#ifdef CAIRO_HAS_PDF_SURFACE
else if (0 == strcasecmp (extension, "pdf"))
constructor = cairo_pdf_surface_create_for_stream;
#endif
#ifdef CAIRO_HAS_PS_SURFACE
else if (0 == strcasecmp (extension, "ps"))
constructor = cairo_ps_surface_create_for_stream;
#ifdef HAS_EPS
else if (0 == strcasecmp (extension, "eps"))
constructor = _cairo_eps_surface_create_for_stream;
#endif
#endif
unsigned int fr, fg, fb, fa, br, bg, bb, ba;
br = bg = bb = ba = 255;
sscanf (view_opts->back + (*view_opts->back=='#'), "%2x%2x%2x%2x", &br, &bg, &bb, &ba);
fr = fg = fb = 0; fa = 255;
sscanf (view_opts->fore + (*view_opts->fore=='#'), "%2x%2x%2x%2x", &fr, &fg, &fb, &fa);
cairo_content_t content;
if (!view_opts->annotate && ba == 255 && br == bg && bg == bb && fr == fg && fg == fb)
content = CAIRO_CONTENT_ALPHA;
else if (ba == 255)
content = CAIRO_CONTENT_COLOR;
else
content = CAIRO_CONTENT_COLOR_ALPHA;
cairo_surface_t *surface;
FILE *f = out_opts->get_file_handle ();
if (constructor)
surface = constructor (stdio_write_func, f, w, h);
else if (constructor2)
surface = constructor2 (stdio_write_func, f, w, h, content);
else
fail (FALSE, "Unknown output format `%s'", extension);
cairo_t *cr = cairo_create (surface);
content = cairo_surface_get_content (surface);
switch (content) {
case CAIRO_CONTENT_ALPHA:
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba (cr, 1., 1., 1., br / 255.);
cairo_paint (cr);
cairo_set_source_rgba (cr, 1., 1., 1.,
(fr / 255.) * (fa / 255.) + (br / 255) * (1 - (fa / 255.)));
break;
default:
case CAIRO_CONTENT_COLOR:
case CAIRO_CONTENT_COLOR_ALPHA:
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba (cr, br / 255., bg / 255., bb / 255., ba / 255.);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_set_source_rgba (cr, fr / 255., fg / 255., fb / 255., fa / 255.);
break;
}
cairo_surface_destroy (surface);
return cr;
}
void
helper_cairo_destroy_context (cairo_t *cr)
{
finalize_closure_t *closure = (finalize_closure_t *)
cairo_surface_get_user_data (cairo_get_target (cr),
&finalize_closure_key);
if (closure)
closure->callback (closure);
cairo_status_t status = cairo_status (cr);
if (status != CAIRO_STATUS_SUCCESS)
fail (FALSE, "Failed: %s",
cairo_status_to_string (status));
cairo_destroy (cr);
}
void
helper_cairo_line_from_buffer (helper_cairo_line_t *l,
hb_buffer_t *buffer,
const char *text,
unsigned int text_len,
double scale)
{
memset (l, 0, sizeof (*l));
l->num_glyphs = hb_buffer_get_length (buffer);
hb_glyph_info_t *hb_glyph = hb_buffer_get_glyph_infos (buffer, NULL);
hb_glyph_position_t *hb_position = hb_buffer_get_glyph_positions (buffer, NULL);
l->glyphs = cairo_glyph_allocate (l->num_glyphs + 1);
if (text) {
l->utf8 = g_strndup (text, text_len);
l->utf8_len = text_len;
l->num_clusters = l->num_glyphs ? 1 : 0;
for (unsigned int i = 1; i < l->num_glyphs; i++)
if (hb_glyph[i].cluster != hb_glyph[i-1].cluster)
l->num_clusters++;
l->clusters = cairo_text_cluster_allocate (l->num_clusters);
}
if ((l->num_glyphs && !l->glyphs) ||
(l->utf8_len && !l->utf8) ||
(l->num_clusters && !l->clusters))
{
l->finish ();
return;
}
hb_position_t x = 0, y = 0;
int i;
for (i = 0; i < (int) l->num_glyphs; i++)
{
l->glyphs[i].index = hb_glyph[i].codepoint;
l->glyphs[i].x = ( hb_position->x_offset + x) * scale;
l->glyphs[i].y = (-hb_position->y_offset + y) * scale;
x += hb_position->x_advance;
y += -hb_position->y_advance;
hb_position++;
}
l->glyphs[i].index = -1;
l->glyphs[i].x = x * scale;
l->glyphs[i].y = y * scale;
if (l->num_clusters) {
memset ((void *) l->clusters, 0, l->num_clusters * sizeof (l->clusters[0]));
hb_bool_t backward = HB_DIRECTION_IS_BACKWARD (hb_buffer_get_direction (buffer));
l->cluster_flags = backward ? CAIRO_TEXT_CLUSTER_FLAG_BACKWARD : (cairo_text_cluster_flags_t) 0;
unsigned int cluster = 0;
l->clusters[cluster].num_glyphs++;
if (backward) {
for (i = l->num_glyphs - 2; i >= 0; i--) {
if (hb_glyph[i].cluster != hb_glyph[i+1].cluster) {
g_assert (hb_glyph[i].cluster > hb_glyph[i+1].cluster);
l->clusters[cluster].num_bytes += hb_glyph[i].cluster - hb_glyph[i+1].cluster;
cluster++;
}
l->clusters[cluster].num_glyphs++;
}
l->clusters[cluster].num_bytes += text_len - hb_glyph[0].cluster;
} else {
for (i = 1; i < (int) l->num_glyphs; i++) {
if (hb_glyph[i].cluster != hb_glyph[i-1].cluster) {
g_assert (hb_glyph[i].cluster > hb_glyph[i-1].cluster);
l->clusters[cluster].num_bytes += hb_glyph[i].cluster - hb_glyph[i-1].cluster;
cluster++;
}
l->clusters[cluster].num_glyphs++;
}
l->clusters[cluster].num_bytes += text_len - hb_glyph[i - 1].cluster;
}
}
}
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