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Bug 96041. Adding win32 glyph extents patch to cairo so it doesn't get lost.
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roc+@cs.cmu.edu
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@ -25,3 +25,7 @@ win32-logical-font-scale.patch: set CAIRO_WIN32_LOGICAL_FONT_SCALE to 1
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nonfatal-assertions.patch: Make assertions non-fatal
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win32-glyph-metrics.patch: GetGlyphOutline only works on Truetype fonts,
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so for non-Truetype fonts, assume no left or right bearing and use the
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font ascent and descent for the glyph extents.
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154
gfx/cairo/win32-glyph-metrics.patch
Normal file
154
gfx/cairo/win32-glyph-metrics.patch
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@ -0,0 +1,154 @@
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Index: gfx/cairo/cairo/src/cairo-win32-font.c
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===================================================================
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RCS file: /cvsroot/mozilla/gfx/cairo/cairo/src/cairo-win32-font.c,v
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retrieving revision 1.37
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diff -u -p -1 -2 -r1.37 cairo-win32-font.c
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--- gfx/cairo/cairo/src/cairo-win32-font.c 22 Sep 2007 13:28:16 -0000 1.37
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+++ gfx/cairo/cairo/src/cairo-win32-font.c 23 Sep 2007 23:55:06 -0000
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@@ -90,24 +90,25 @@ typedef struct {
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cairo_bool_t swap_x;
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cairo_bool_t swap_y;
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double x_scale;
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double y_scale;
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/* The size of the design unit of the font
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*/
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int em_square;
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HFONT scaled_hfont;
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HFONT unscaled_hfont;
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+ cairo_bool_t is_truetype;
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cairo_bool_t glyph_indexing;
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cairo_bool_t delete_scaled_hfont;
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} cairo_win32_scaled_font_t;
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static cairo_status_t
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_cairo_win32_scaled_font_set_metrics (cairo_win32_scaled_font_t *scaled_font);
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static cairo_status_t
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_cairo_win32_scaled_font_init_glyph_metrics (cairo_win32_scaled_font_t *scaled_font,
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cairo_scaled_glyph_t *scaled_glyph);
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@@ -735,64 +736,81 @@ _cairo_win32_scaled_font_set_metrics (ca
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return status;
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GetTextMetrics (hdc, &metrics);
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_cairo_win32_scaled_font_done_unscaled_font (&scaled_font->base);
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extents.ascent = (double)metrics.tmAscent / scaled_font->em_square;
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extents.descent = (double)metrics.tmDescent / scaled_font->em_square;
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extents.height = (double)(metrics.tmHeight + metrics.tmExternalLeading) / scaled_font->em_square;
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extents.max_x_advance = (double)(metrics.tmMaxCharWidth) / scaled_font->em_square;
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extents.max_y_advance = 0;
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}
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- if ((metrics.tmPitchAndFamily & TMPF_TRUETYPE) ||
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- (GetFontData (hdc, OPENTYPE_CFF_TAG, 0, NULL, 0) != GDI_ERROR))
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- scaled_font->glyph_indexing = TRUE;
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- else
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- scaled_font->glyph_indexing = FALSE;
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+ scaled_font->is_truetype = (metrics.tmPitchAndFamily & TMPF_TRUETYPE) != 0;
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+ scaled_font->glyph_indexing = scaled_font->is_truetype ||
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+ (GetFontData (hdc, OPENTYPE_CFF_TAG, 0, NULL, 0) != GDI_ERROR);
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+ // XXX in what situations does this OPENTYPE_CFF thing not have the
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+ // TMPF_TRUETYPE flag? GetFontData says it only works on Truetype fonts...
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_cairo_scaled_font_set_metrics (&scaled_font->base, &extents);
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_status_t
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_cairo_win32_scaled_font_init_glyph_metrics (cairo_win32_scaled_font_t *scaled_font,
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cairo_scaled_glyph_t *scaled_glyph)
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{
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static const MAT2 matrix = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, 1 } };
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GLYPHMETRICS metrics;
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cairo_status_t status;
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cairo_text_extents_t extents;
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HDC hdc;
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- UINT glyph_index_option;
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hdc = _get_global_font_dc ();
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if (!hdc)
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return CAIRO_STATUS_NO_MEMORY;
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- if (scaled_font->glyph_indexing)
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- glyph_index_option = GGO_GLYPH_INDEX;
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- else
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- glyph_index_option = 0;
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+ if (!scaled_font->is_truetype) {
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+ /* GetGlyphOutline will not work. Assume that the glyph does not extend outside the font box. */
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+ cairo_font_extents_t font_extents;
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+ INT width = 0;
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+ UINT charIndex = _cairo_scaled_glyph_index (scaled_glyph);
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+
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+ cairo_scaled_font_extents (&scaled_font->base, &font_extents);
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+
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+ status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
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+ if (!status) {
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+ if (!GetCharWidth32(hdc, charIndex, charIndex, &width)) {
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+ status = _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_init_glyph_metrics:GetCharWidth32");
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+ width = 0;
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+ }
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+ }
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+ cairo_win32_scaled_font_done_font (&scaled_font->base);
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- if (scaled_font->preserve_axes && scaled_font->base.options.hint_style != CAIRO_HINT_METRICS_OFF) {
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+ extents.x_bearing = 0;
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+ extents.y_bearing = -font_extents.ascent / scaled_font->y_scale;
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+ extents.width = width / scaled_font->x_scale;
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+ extents.height = (font_extents.ascent + font_extents.descent) / scaled_font->y_scale;
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+ extents.x_advance = extents.width;
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+ extents.y_advance = 0;
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+ } else if (scaled_font->preserve_axes && scaled_font->base.options.hint_style != CAIRO_HINT_METRICS_OFF) {
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/* If we aren't rotating / skewing the axes, then we get the metrics
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* from the GDI in device space and convert to font space.
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*/
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status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
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if (status)
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return status;
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if (GetGlyphOutlineW (hdc, _cairo_scaled_glyph_index (scaled_glyph),
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- GGO_METRICS | glyph_index_option,
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+ GGO_METRICS | GGO_GLYPH_INDEX,
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&metrics, 0, NULL, &matrix) == GDI_ERROR) {
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status = _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_init_glyph_metrics:GetGlyphOutlineW");
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memset (&metrics, 0, sizeof (GLYPHMETRICS));
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}
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cairo_win32_scaled_font_done_font (&scaled_font->base);
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if (scaled_font->swap_axes) {
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extents.x_bearing = - metrics.gmptGlyphOrigin.y / scaled_font->y_scale;
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extents.y_bearing = metrics.gmptGlyphOrigin.x / scaled_font->x_scale;
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extents.width = metrics.gmBlackBoxY / scaled_font->y_scale;
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extents.height = metrics.gmBlackBoxX / scaled_font->x_scale;
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extents.x_advance = metrics.gmCellIncY / scaled_font->x_scale;
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@@ -813,25 +831,25 @@ _cairo_win32_scaled_font_init_glyph_metr
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if (scaled_font->swap_y) {
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extents.y_bearing = (- extents.y_bearing - extents.height);
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extents.y_advance = - extents.y_advance;
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}
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} else {
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/* For all other transformations, we use the design metrics
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* of the font.
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*/
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status = _cairo_win32_scaled_font_select_unscaled_font (&scaled_font->base, hdc);
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if (GetGlyphOutlineW (hdc, _cairo_scaled_glyph_index (scaled_glyph),
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- GGO_METRICS | glyph_index_option,
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+ GGO_METRICS | GGO_GLYPH_INDEX,
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&metrics, 0, NULL, &matrix) == GDI_ERROR) {
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status = _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_init_glyph_metrics:GetGlyphOutlineW");
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memset (&metrics, 0, sizeof (GLYPHMETRICS));
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}
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_cairo_win32_scaled_font_done_unscaled_font (&scaled_font->base);
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extents.x_bearing = (double)metrics.gmptGlyphOrigin.x / scaled_font->em_square;
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extents.y_bearing = - (double)metrics.gmptGlyphOrigin.y / scaled_font->em_square;
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extents.width = (double)metrics.gmBlackBoxX / scaled_font->em_square;
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extents.height = (double)metrics.gmBlackBoxY / scaled_font->em_square;
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extents.x_advance = (double)metrics.gmCellIncX / scaled_font->em_square;
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extents.y_advance = (double)metrics.gmCellIncY / scaled_font->em_square;
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