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Add ft-show-glyphs-positioning test

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This demonstrates the glyph positioning bug in the PS backend.
This commit is contained in:
Adrian Johnson 2008-03-21 16:06:12 +10:30
parent 37fedd108e
commit 8348668452
4 changed files with 170 additions and 0 deletions
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1
test/.gitignore vendored
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@ -64,6 +64,7 @@ fill-rule
filter-nearest-offset
ft-text-antialias-none
ft-font-create-for-ft-face
ft-show-glyphs-positioning
ft-text-vertical-layout-type1
ft-text-vertical-layout-type3
font-face-get-type

2
test/Makefile.am
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@ -195,6 +195,7 @@ endif
if CAIRO_HAS_FT_FONT
TESTS += bitmap-font$(EXEEXT)
TESTS += ft-font-create-for-ft-face$(EXEEXT)
TESTS += ft-show-glyphs-positioning$(EXEEXT)
TESTS += ft-text-vertical-layout-type1$(EXEEXT)
TESTS += ft-text-vertical-layout-type3$(EXEEXT)
TESTS += ft-text-antialias-none$(EXEEXT)
@ -373,6 +374,7 @@ REFERENCE_IMAGES = \
font-matrix-translation-quartz-ref.png \
ft-text-antialias-none-ps-argb32-ref.png \
ft-text-antialias-none-ref.png \
ft-show-glyphs-positioning-ref.png \
ft-text-vertical-layout-type1-ps-ref.png \
ft-text-vertical-layout-type1-ref.png \
ft-text-vertical-layout-type1-svg-ref.png \

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test/ft-show-glyphs-positioning-ref.png Normal file
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167
test/ft-show-glyphs-positioning.c Normal file
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@ -0,0 +1,167 @@
/*
* Copyright © 2008 Adrian Johnson
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairo-test.h"
#include <cairo-ft.h>
#define TEXT_SIZE 12
static cairo_test_draw_function_t draw;
cairo_test_t test = {
"ft-show-glyphs-positioning",
"Test that the PS/PDF glyph positioning optimizations are correct",
235, (TEXT_SIZE + 4)*2,
draw
};
typedef struct {
cairo_glyph_t glyph_list[100];
int num_glyphs;
double x;
double y;
} glyph_array_t;
static void
glyph_array_init (glyph_array_t *glyphs, double x, double y)
{
glyphs->num_glyphs = 0;
glyphs->x = x;
glyphs->y = y;
}
static void
glyph_array_rel_move_to (glyph_array_t *glyphs, double x, double y)
{
glyphs->x += x;
glyphs->y += y;
}
static void
glyph_array_show (glyph_array_t *glyphs, cairo_t *cr)
{
cairo_show_glyphs (cr, glyphs->glyph_list, glyphs->num_glyphs);
}
#define DOUBLE_FROM_26_6(t) ((double)(t) / 64.0)
static void
glyph_array_add_text(glyph_array_t *glyphs, cairo_t *cr, const char *s, double spacing)
{
cairo_scaled_font_t *scaled_font;
FT_Face face;
unsigned long charcode;
unsigned int index;
cairo_text_extents_t extents;
const char *p;
FT_Vector kerning;
double kern_x;
int first = TRUE;
scaled_font = cairo_get_scaled_font (cr);
face = cairo_ft_scaled_font_lock_face (scaled_font);
p = s;
while (*p)
{
charcode = *p;
index = FT_Get_Char_Index (face, charcode);
glyphs->glyph_list[glyphs->num_glyphs].index = index;
if (first) {
first = FALSE;
glyphs->glyph_list[glyphs->num_glyphs].x = glyphs->x;
glyphs->glyph_list[glyphs->num_glyphs].y = glyphs->y;
} else {
cairo_glyph_extents (cr, &glyphs->glyph_list[glyphs->num_glyphs - 1], 1, &extents);
FT_Get_Kerning (face,
glyphs->glyph_list[glyphs->num_glyphs - 1].index,
glyphs->glyph_list[glyphs->num_glyphs].index,
FT_KERNING_UNSCALED,
&kerning);
kern_x = DOUBLE_FROM_26_6(kerning.x);
glyphs->glyph_list[glyphs->num_glyphs].x =
glyphs->glyph_list[glyphs->num_glyphs - 1].x + extents.x_advance + kern_x + spacing;
glyphs->glyph_list[glyphs->num_glyphs].y =
glyphs->glyph_list[glyphs->num_glyphs - 1].y + extents.y_advance;
}
cairo_glyph_extents (cr, &glyphs->glyph_list[glyphs->num_glyphs], 1, &extents);
glyphs->x = glyphs->glyph_list[glyphs->num_glyphs].x + extents.x_advance + spacing;
glyphs->y = glyphs->glyph_list[glyphs->num_glyphs].y + extents.y_advance;
p++;
glyphs->num_glyphs++;
}
cairo_ft_scaled_font_unlock_face (scaled_font);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
glyph_array_t glyphs;
cairo_font_options_t *font_options;
/* paint white so we don't need separate ref images for
* RGB24 and ARGB32 */
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
cairo_select_font_face (cr, "Bitstream Vera Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, TEXT_SIZE);
font_options = cairo_font_options_create ();
cairo_get_font_options (cr, font_options);
cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
cairo_set_font_options (cr, font_options);
cairo_font_options_destroy (font_options);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
glyph_array_init (&glyphs, 1, TEXT_SIZE);
glyph_array_add_text(&glyphs, cr, "AWAY again", 0.0);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*1, 0.0);
glyph_array_add_text(&glyphs, cr, "character space", TEXT_SIZE*0.3);
glyph_array_show (&glyphs, cr);
glyph_array_init (&glyphs, 1, TEXT_SIZE*2 + 4);
glyph_array_add_text(&glyphs, cr, "Increasing", 0.0);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*0.5, 0.0);
glyph_array_add_text(&glyphs, cr, "space", 0.0);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*1.0, 0.0);
glyph_array_add_text(&glyphs, cr, "between", 0.0);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*1.5, 0.0);
glyph_array_add_text(&glyphs, cr, "words", 0.0);
glyph_array_show (&glyphs, cr);
return CAIRO_TEST_SUCCESS;
}
int
main (void)
{
return cairo_test (&test);
}