float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return widthForGDIGlyph(glyph);
if (!m_platformData.size())
return 0;
HDC hdc = GetDC(0);
SaveDC(hdc);
cairo_scaled_font_t* scaledFont = m_platformData.scaledFont();
cairo_win32_scaled_font_select_font(scaledFont, hdc);
int width;
GetCharWidthI(hdc, glyph, 1, 0, &width);
cairo_win32_scaled_font_done_font(scaledFont);
RestoreDC(hdc, -1);
ReleaseDC(0, hdc);
const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size();
return width * metricsMultiplier;
}
static gboolean
pango_cairo_win32_font_select_font (PangoFont *font,
HDC hdc)
{
cairo_scaled_font_t *scaled_font = pango_cairo_win32_font_get_scaled_font (PANGO_CAIRO_FONT (font));
return cairo_win32_scaled_font_select_font (scaled_font, hdc) == CAIRO_STATUS_SUCCESS;
}
void SimpleFontData::platformInit()
{
m_scriptCache = 0;
m_scriptFontProperties = 0;
m_isSystemFont = false;
m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
if (m_platformData.useGDI())
return initGDIFont();
HDC hdc = GetDC(0);
SaveDC(hdc);
cairo_scaled_font_t* scaledFont = m_platformData.scaledFont();
const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size();
cairo_win32_scaled_font_select_font(scaledFont, hdc);
TEXTMETRIC textMetrics;
GetTextMetrics(hdc, &textMetrics);
float ascent = textMetrics.tmAscent * metricsMultiplier;
float descent = textMetrics.tmDescent * metricsMultiplier;
float xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts.
float lineGap = textMetrics.tmExternalLeading * metricsMultiplier;
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
m_avgCharWidth = textMetrics.tmAveCharWidth * metricsMultiplier;
m_maxCharWidth = textMetrics.tmMaxCharWidth * metricsMultiplier;
OUTLINETEXTMETRIC metrics;
if (GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics) > 0) {
// This is a TrueType font. We might be able to get an accurate xHeight
GLYPHMETRICS gm;
MAT2 mat = { 1, 0, 0, 1 };
DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat);
if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0)
xHeight = gm.gmptGlyphOrigin.y * metricsMultiplier;
}
m_fontMetrics.setXHeight(xHeight);
cairo_win32_scaled_font_done_font(scaledFont);
m_isSystemFont = false;
m_scriptCache = 0;
m_scriptFontProperties = 0;
RestoreDC(hdc, -1);
ReleaseDC(0, hdc);
}
void SelectFont() {
if (mFontSelected)
return;
cairo_t *cr = mContext->GetCairo();
cairo_set_font_face(cr, mShaper->GetFont()->CairoFontFace());
cairo_set_font_size(cr, mShaper->GetFont()->GetAdjustedSize());
cairo_scaled_font_t *scaledFont = mShaper->GetFont()->CairoScaledFont();
cairo_win32_scaled_font_select_font(scaledFont, mDC);
mFontSelected = true;
}
PRBool
gfxGDIFont::SetupCairoFont(gfxContext *aContext)
{
if (!mMetrics) {
Initialize();
}
if (!mScaledFont ||
cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
// Don't cairo_set_scaled_font as that would propagate the error to
// the cairo_t, precluding any further drawing.
return PR_FALSE;
}
cairo_set_scaled_font(aContext->GetCairo(), mScaledFont);
cairo_win32_scaled_font_select_font(mScaledFont, DCFromContext(aContext));
return PR_TRUE;
}
void Font::platformInit()
{
m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
m_scriptCache = 0;
m_scriptFontProperties = 0;
m_isSystemFont = false;
if (m_platformData.useGDI())
return initGDIFont();
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
m_isSystemFont = false;
m_scriptCache = 0;
m_scriptFontProperties = 0;
return;
}
HWndDC dc(0);
SaveDC(dc);
cairo_scaled_font_t* scaledFont = m_platformData.scaledFont();
const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size();
cairo_win32_scaled_font_select_font(scaledFont, dc);
TEXTMETRIC textMetrics;
GetTextMetrics(dc, &textMetrics);
float ascent = textMetrics.tmAscent * metricsMultiplier;
float descent = textMetrics.tmDescent * metricsMultiplier;
float xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts.
float lineGap = textMetrics.tmExternalLeading * metricsMultiplier;
int faceLength = ::GetTextFace(dc, 0, 0);
Vector<WCHAR> faceName(faceLength);
::GetTextFace(dc, faceLength, faceName.data());
m_isSystemFont = !wcscmp(faceName.data(), L"Lucida Grande");
ascent = ascentConsideringMacAscentHack(faceName.data(), ascent, descent);
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
m_avgCharWidth = textMetrics.tmAveCharWidth * metricsMultiplier;
m_maxCharWidth = textMetrics.tmMaxCharWidth * metricsMultiplier;
cairo_text_extents_t extents;
cairo_scaled_font_text_extents(scaledFont, "x", &extents);
xHeight = -extents.y_bearing;
m_fontMetrics.setXHeight(xHeight);
cairo_win32_scaled_font_done_font(scaledFont);
m_scriptCache = 0;
m_scriptFontProperties = 0;
RestoreDC(dc, -1);
}
cairo_int_status_t
_cairo_win32_surface_emit_glyphs (cairo_win32_surface_t *dst,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
cairo_bool_t glyph_indexing)
{
#if CAIRO_HAS_WIN32_FONT
WORD glyph_buf_stack[STACK_GLYPH_SIZE];
WORD *glyph_buf = glyph_buf_stack;
int dxy_buf_stack[2 * STACK_GLYPH_SIZE];
int *dxy_buf = dxy_buf_stack;
BOOL win_result = 0;
int i, j;
cairo_solid_pattern_t *solid_pattern;
COLORREF color;
cairo_matrix_t device_to_logical;
int start_x, start_y;
double user_x, user_y;
int logical_x, logical_y;
unsigned int glyph_index_option;
/* We can only handle win32 fonts */
assert (cairo_scaled_font_get_type (scaled_font) == CAIRO_FONT_TYPE_WIN32);
/* We can only handle opaque solid color sources and destinations */
assert (_cairo_pattern_is_opaque_solid(source));
assert (dst->format == CAIRO_FORMAT_RGB24);
solid_pattern = (cairo_solid_pattern_t *)source;
color = RGB(((int)solid_pattern->color.red_short) >> 8,
((int)solid_pattern->color.green_short) >> 8,
((int)solid_pattern->color.blue_short) >> 8);
cairo_win32_scaled_font_get_device_to_logical(scaled_font, &device_to_logical);
SaveDC(dst->dc);
cairo_win32_scaled_font_select_font(scaled_font, dst->dc);
SetTextColor(dst->dc, color);
SetTextAlign(dst->dc, TA_BASELINE | TA_LEFT);
SetBkMode(dst->dc, TRANSPARENT);
if (num_glyphs > STACK_GLYPH_SIZE) {
glyph_buf = (WORD *) _cairo_malloc_ab (num_glyphs, sizeof(WORD));
dxy_buf = (int *) _cairo_malloc_abc (num_glyphs, sizeof(int), 2);
}
/* It is vital that dx values for dxy_buf are calculated from the delta of
* _logical_ x coordinates (not user x coordinates) or else the sum of all
* previous dx values may start to diverge from the current glyph's x
* coordinate due to accumulated rounding error. As a result strings could
* be painted shorter or longer than expected. */
user_x = glyphs[0].x;
user_y = glyphs[0].y;
cairo_matrix_transform_point(&device_to_logical,
&user_x, &user_y);
logical_x = _cairo_lround (user_x);
logical_y = _cairo_lround (user_y);
start_x = logical_x;
start_y = logical_y;
for (i = 0, j = 0; i < num_glyphs; ++i, j = 2 * i) {
glyph_buf[i] = (WORD) glyphs[i].index;
if (i == num_glyphs - 1) {
dxy_buf[j] = 0;
dxy_buf[j+1] = 0;
} else {
double next_user_x = glyphs[i+1].x;
double next_user_y = glyphs[i+1].y;
int next_logical_x, next_logical_y;
cairo_matrix_transform_point(&device_to_logical,
&next_user_x, &next_user_y);
next_logical_x = _cairo_lround (next_user_x);
next_logical_y = _cairo_lround (next_user_y);
dxy_buf[j] = _cairo_lround (next_logical_x - logical_x);
dxy_buf[j+1] = _cairo_lround (next_logical_y - logical_y);
logical_x = next_logical_x;
logical_y = next_logical_y;
}
}
if (glyph_indexing)
glyph_index_option = ETO_GLYPH_INDEX;
else
glyph_index_option = 0;
win_result = ExtTextOutW(dst->dc,
start_x,
start_y,
glyph_index_option | ETO_PDY,
NULL,
glyph_buf,
num_glyphs,
dxy_buf);
if (!win_result) {
_cairo_win32_print_gdi_error("_cairo_win32_surface_show_glyphs(ExtTextOutW failed)");
}
RestoreDC(dst->dc, -1);
if (glyph_buf != glyph_buf_stack) {
free(glyph_buf);
free(dxy_buf);
}
return (win_result) ? CAIRO_STATUS_SUCCESS : CAIRO_INT_STATUS_UNSUPPORTED;
#else
return CAIRO_INT_STATUS_UNSUPPORTED;
#endif
}
