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DWrite: Add support for font variations

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Fixes https://gitlab.freedesktop.org/cairo/cairo/-/issues/877
This commit is contained in:
Luca Bacci 2024-11-08 11:52:10 +01:00
parent 6cd0a7d395
commit b84b3542d1
1 changed files with 101 additions and 2 deletions
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103
src/win32/cairo-dwrite-font.cpp
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@ -626,6 +626,54 @@ do_grayscale(IDWriteFontFace *dwface, unsigned int ppem)
return true;
}
static void
set_dwrite_axes_from_string (const char *string,
DWRITE_FONT_AXIS_VALUE *dwrite_axes,
UINT32 count)
{
const char *p = string;
while (p && *p) {
const char *start;
const char *end, *end2;
DWRITE_FONT_AXIS_TAG tag;
double value;
while (_cairo_isspace (*p)) p++;
start = p;
end = strchr (p, ',');
if (end && (end - p < 6))
goto skip;
tag = DWRITE_MAKE_FONT_AXIS_TAG (p[0], p[1], p[2], p[3]);
p += 4;
while (_cairo_isspace (*p)) p++;
if (*p == '=') p++;
if (p - start < 5)
goto skip;
value = _cairo_strtod (p, (char **) &end2);
while (end2 && _cairo_isspace (*end2)) end2++;
if (end2 && (*end2 != ',' && *end2 != '\0'))
goto skip;
for (UINT32 i = 0; i < count; i++) {
if (dwrite_axes[i].axisTag == tag) {
dwrite_axes[i].value = value;
break;
}
}
skip:
p = end ? end + 1 : NULL;
}
}
static cairo_status_t
_cairo_dwrite_font_face_scaled_font_create (void *abstract_face,
const cairo_matrix_t *font_matrix,
@ -654,8 +702,59 @@ _cairo_dwrite_font_face_scaled_font_create (void *abstract_face,
return status;
}
dwrite_font->dwriteface->AddRef ();
dwrite_font->dwriteface = dwrite_font->dwriteface;
if (options->variations) {
RefPtr<IDWriteFontFace5> dwriteface5;
/* Since Windows 10 20348 */
if (SUCCEEDED (font_face->dwriteface->QueryInterface(&dwriteface5))) {
RefPtr<IDWriteFontResource> dwritefontresource;
if (dwriteface5->HasVariations () &&
SUCCEEDED (dwriteface5->GetFontResource (&dwritefontresource)))
{
UINT32 count = MIN (dwriteface5->GetFontAxisValueCount (), 500);
DWRITE_FONT_AXIS_VALUE *dwrite_axes = new DWRITE_FONT_AXIS_VALUE[count];
UINT32 variables_count = 0;
/* Sort variable axes first */
for (UINT32 i = 0; i < count; i++) {
if (dwritefontresource->GetFontAxisAttributes (i) & DWRITE_FONT_AXIS_ATTRIBUTES_VARIABLE) {
if (variables_count != i) {
DWRITE_FONT_AXIS_VALUE swap_aux = dwrite_axes[variables_count];
dwrite_axes[variables_count] = dwrite_axes[i];
dwrite_axes[i] = swap_aux;
}
variables_count++;
}
}
if (SUCCEEDED (dwriteface5->GetFontAxisValues(dwrite_axes, count))) {
RefPtr<IDWriteFontFace5> dwriteface_new5;
set_dwrite_axes_from_string (options->variations, dwrite_axes, variables_count);
/* Can't use constexpr with mingw-w64 headers */
const DWRITE_FONT_SIMULATIONS all_simulations = DWRITE_FONT_SIMULATIONS_BOLD |
DWRITE_FONT_SIMULATIONS_OBLIQUE;
if (SUCCEEDED (dwritefontresource->CreateFontFace(all_simulations,
dwrite_axes,
count,
&dwriteface_new5)))
{
dwrite_font->dwriteface = dwriteface_new5.forget().drop();
}
}
delete[] dwrite_axes;
}
}
}
if (!dwrite_font->dwriteface) {
font_face->dwriteface->AddRef ();
dwrite_font->dwriteface = font_face->dwriteface;
}
dwrite_font->mat = dwrite_font->base.ctm;
cairo_matrix_multiply(&dwrite_font->mat, &dwrite_font->mat, font_matrix);