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-rw-r--r--test/user-font-rescale.c368
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diff --git a/test/user-font-rescale.c b/test/user-font-rescale.c
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+/*
+ * Copyright © 2008 Jeff Muizelaar
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Jeff Muizelaar not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Jeff Muizelaar makes no representations about the
+ * suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * JEFF MUIZELAAR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL JEFF MUIZELAAR BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Contributor(s):
+ * Jeff Muizelaar <jeff@infidigm.net>
+ * Kristian Høgsberg <krh@redhat.com>
+ * Behdad Esfahbod <behdad@behdad.org>
+ */
+
+#include "cairo-test.h"
+
+#include <math.h>
+
+#define BORDER 10
+#define TEXT_SIZE 32
+#define WIDTH (TEXT_SIZE * 13.75 + 2*BORDER)
+#define HEIGHT ((TEXT_SIZE + 2*BORDER)*3 + BORDER)
+#define TEXT "test of rescaled glyphs"
+
+static const cairo_user_data_key_t rescale_font_closure_key;
+
+struct rescaled_font {
+ cairo_font_face_t *substitute_font;
+ cairo_scaled_font_t *measuring_font;
+ unsigned long glyph_count;
+ unsigned long start;
+ double *desired_width;
+ double *rescale_factor;
+};
+
+static cairo_status_t
+test_scaled_font_render_glyph (cairo_scaled_font_t *scaled_font,
+ unsigned long glyph,
+ cairo_t *cr,
+ cairo_text_extents_t *metrics)
+{
+ cairo_font_face_t *user_font;
+ struct rescaled_font *r;
+ cairo_glyph_t cairo_glyph;
+
+ cairo_glyph.index = glyph;
+ cairo_glyph.x = 0;
+ cairo_glyph.y = 0;
+
+ user_font = cairo_scaled_font_get_font_face (scaled_font);
+ r = cairo_font_face_get_user_data (user_font, &rescale_font_closure_key);
+ cairo_set_font_face (cr, r->substitute_font);
+
+ if (glyph - r->start < r->glyph_count) {
+ cairo_matrix_t matrix;
+
+ if (isnan (r->rescale_factor[glyph - r->start])) {
+ double desired_width;
+ double actual_width;
+ cairo_text_extents_t extents;
+
+ /* measure the glyph and compute the necessary rescaling factor */
+ cairo_scaled_font_glyph_extents (r->measuring_font,
+ &cairo_glyph, 1,
+ &extents);
+
+ desired_width = r->desired_width[glyph - r->start];
+ actual_width = extents.x_advance;
+
+ r->rescale_factor[glyph - r->start] = desired_width / actual_width;
+ }
+
+ /* scale the font so that the glyph width matches the desired width */
+ cairo_get_font_matrix (cr, &matrix);
+ cairo_matrix_scale (&matrix, r->rescale_factor[glyph - r->start], 1.);
+ cairo_set_font_matrix (cr, &matrix);
+ }
+
+ cairo_show_glyphs (cr, &cairo_glyph, 1);
+ cairo_glyph_extents (cr, &cairo_glyph, 1, metrics);
+
+ return CAIRO_STATUS_SUCCESS;
+}
+
+static void
+unichar_to_utf8 (uint32_t ucs4, char utf8[7])
+{
+ int i, charlen, first;
+
+ if (ucs4 < 0x80) {
+ first = 0;
+ charlen = 1;
+ } else if (ucs4 < 0x800) {
+ first = 0xc0;
+ charlen = 2;
+ } else if (ucs4 < 0x10000) {
+ first = 0xe0;
+ charlen = 3;
+ } else if (ucs4 < 0x200000) {
+ first = 0xf0;
+ charlen = 4;
+ } else if (ucs4 < 0x4000000) {
+ first = 0xf8;
+ charlen = 5;
+ } else {
+ first = 0xfc;
+ charlen = 6;
+ }
+
+ for (i = charlen - 1; i > 0; --i) {
+ utf8[i] = (ucs4 & 0x3f) | 0x80;
+ ucs4 >>= 6;
+ }
+ utf8[0] = ucs4 | first;
+ utf8[charlen] = '\0';
+}
+
+static cairo_status_t
+test_scaled_font_unicode_to_glyph (cairo_scaled_font_t *scaled_font,
+ unsigned long unicode,
+ unsigned long *glyph_index)
+{
+ cairo_font_face_t *user_font;
+ struct rescaled_font *r;
+ int num_glyphs;
+ cairo_glyph_t *glyphs = NULL;
+ cairo_status_t status;
+ char utf8[7];
+
+ user_font = cairo_scaled_font_get_font_face (scaled_font);
+
+ unichar_to_utf8 (unicode, utf8);
+ r = cairo_font_face_get_user_data (user_font, &rescale_font_closure_key);
+ status = cairo_scaled_font_text_to_glyphs (r->measuring_font, 0, 0,
+ utf8, -1,
+ &glyphs, &num_glyphs,
+ NULL, NULL, NULL);
+ if (status)
+ return status;
+
+ *glyph_index = glyphs[0].index;
+
+ cairo_glyph_free (glyphs);
+ return CAIRO_STATUS_SUCCESS;
+}
+
+static void rescale_font_closure_destroy (void *data)
+{
+ struct rescaled_font *r = data;
+
+ cairo_font_face_destroy (r->substitute_font);
+ cairo_scaled_font_destroy (r->measuring_font);
+ free (r->desired_width);
+ free (r->rescale_factor);
+ free (r);
+}
+
+static cairo_status_t
+create_rescaled_font (cairo_font_face_t *substitute_font,
+ int glyph_start,
+ int glyph_count,
+ double *desired_width,
+ cairo_font_face_t **out)
+{
+ cairo_font_face_t *user_font_face;
+ struct rescaled_font *r;
+ cairo_font_options_t *options;
+ cairo_status_t status;
+ cairo_matrix_t m;
+ unsigned long i;
+
+ user_font_face = cairo_user_font_face_create ();
+ cairo_user_font_face_set_render_glyph_func (user_font_face, test_scaled_font_render_glyph);
+ cairo_user_font_face_set_unicode_to_glyph_func (user_font_face, test_scaled_font_unicode_to_glyph);
+
+ r = xmalloc (sizeof (struct rescaled_font));
+ r->substitute_font = cairo_font_face_reference (substitute_font);
+
+ /* we don't want any hinting when doing the measuring */
+ options = cairo_font_options_create ();
+ cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE);
+ cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_OFF);
+
+ cairo_matrix_init_identity (&m);
+
+ r->measuring_font = cairo_scaled_font_create (r->substitute_font,
+ &m, &m,
+ options);
+ cairo_font_options_destroy (options);
+
+
+ r->start = glyph_start;
+ r->glyph_count = glyph_count;
+ r->desired_width = xcalloc (sizeof (double), r->glyph_count);
+ r->rescale_factor = xcalloc (sizeof (double), r->glyph_count);
+
+ for (i = 0; i < r->glyph_count; i++) {
+ r->desired_width[i] = desired_width[i];
+ /* use NaN to specify unset */
+ r->rescale_factor[i] = cairo_test_NaN ();
+ }
+
+ status = cairo_font_face_set_user_data (user_font_face,
+ &rescale_font_closure_key,
+ r, rescale_font_closure_destroy);
+ if (status) {
+ rescale_font_closure_destroy (r);
+ cairo_font_face_destroy (user_font_face);
+ return status;
+ }
+
+ *out = user_font_face;
+ return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
+get_user_font_face (cairo_font_face_t *substitute_font,
+ const char *text,
+ cairo_font_face_t *old,
+ cairo_font_face_t **out)
+{
+ cairo_font_options_t *options;
+ cairo_matrix_t m;
+ cairo_scaled_font_t *measure;
+ int i;
+ double *widths;
+ int count;
+ int num_glyphs;
+ unsigned long min_index, max_index;
+ cairo_status_t status;
+
+ cairo_glyph_t *glyphs = NULL;
+
+ /* we don't want any hinting when doing the measuring */
+ options = cairo_font_options_create ();
+ cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE);
+ cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_OFF);
+
+ cairo_matrix_init_identity (&m);
+ measure = cairo_scaled_font_create (old, &m, &m, options);
+
+ status = cairo_scaled_font_text_to_glyphs (measure, 0, 0,
+ text, -1,
+ &glyphs, &num_glyphs,
+ NULL, NULL, NULL);
+ cairo_font_options_destroy (options);
+
+ if (status) {
+ cairo_scaled_font_destroy (measure);
+ return status;
+ }
+
+ /* find the glyph range the text covers */
+ max_index = glyphs[0].index;
+ min_index = glyphs[0].index;
+ for (i=0; i<num_glyphs; i++) {
+ if (glyphs[i].index < min_index)
+ min_index = glyphs[i].index;
+ if (glyphs[i].index > max_index)
+ max_index = glyphs[i].index;
+ }
+
+ count = max_index - min_index + 1;
+ widths = xcalloc (sizeof (double), count);
+ /* measure all of the necessary glyphs individually */
+ for (i=0; i<num_glyphs; i++) {
+ cairo_text_extents_t extents;
+ cairo_scaled_font_glyph_extents (measure, &glyphs[i], 1, &extents);
+ widths[glyphs[i].index - min_index] = extents.x_advance;
+ }
+
+ status = cairo_scaled_font_status (measure);
+ cairo_scaled_font_destroy (measure);
+ cairo_glyph_free (glyphs);
+
+ if (status == CAIRO_STATUS_SUCCESS) {
+ status = create_rescaled_font (substitute_font,
+ min_index, count, widths,
+ out);
+ }
+
+ free (widths);
+ return status;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ cairo_font_extents_t font_extents;
+ cairo_text_extents_t extents;
+ cairo_font_face_t *rescaled;
+ cairo_font_face_t *old;
+ cairo_font_face_t *substitute;
+ const char text[] = TEXT;
+ cairo_status_t status;
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_paint (cr);
+
+ cairo_select_font_face (cr,
+ CAIRO_TEST_FONT_FAMILY " Sans",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_NORMAL);
+
+ cairo_set_font_size (cr, TEXT_SIZE);
+
+ cairo_font_extents (cr, &font_extents);
+ cairo_text_extents (cr, text, &extents);
+
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_move_to (cr, BORDER, BORDER + font_extents.ascent);
+ cairo_show_text (cr, text);
+
+ /* same text in 'mono' with widths that match the 'sans' version */
+ old = cairo_font_face_reference (cairo_get_font_face (cr));
+ cairo_select_font_face (cr,
+ CAIRO_TEST_FONT_FAMILY " Sans Mono",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_NORMAL);
+ substitute = cairo_get_font_face (cr);
+
+ status = get_user_font_face (substitute, text, old, &rescaled);
+ cairo_font_face_destroy (old);
+ if (status) {
+ return cairo_test_status_from_status (cairo_test_get_context (cr),
+ status);
+ }
+
+ cairo_set_font_face (cr, rescaled);
+ cairo_font_face_destroy (rescaled);
+
+ cairo_set_source_rgb (cr, 0, 0, 1);
+ cairo_move_to (cr, BORDER, BORDER + font_extents.height + 2*BORDER + font_extents.ascent);
+ cairo_show_text (cr, text);
+
+ /* mono text */
+ cairo_select_font_face (cr,
+ CAIRO_TEST_FONT_FAMILY " Sans Mono",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_NORMAL);
+
+ cairo_set_source_rgb (cr, 0, 0, 1);
+ cairo_move_to (cr, BORDER, BORDER + 2*font_extents.height + 4*BORDER + font_extents.ascent);
+ cairo_show_text (cr, text);
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (user_font_rescale,
+ "Tests drawing text with user defined widths",
+ "user-font, font", /* keywords */
+ NULL, /* requirements */
+ WIDTH, HEIGHT,
+ NULL, draw)
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