void Font::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
int from, int numGlyphs, const FloatPoint& point) const
{
CGContextRef cgContext = graphicsContext->platformContext();
bool shouldUseFontSmoothing = WebCoreShouldUseFontSmoothing();
switch(fontDescription().fontSmoothing()) {
case Antialiased: {
graphicsContext->setShouldAntialias(true);
shouldUseFontSmoothing = false;
break;
}
case SubpixelAntialiased: {
graphicsContext->setShouldAntialias(true);
shouldUseFontSmoothing = true;
break;
}
case NoSmoothing: {
graphicsContext->setShouldAntialias(false);
shouldUseFontSmoothing = false;
break;
}
case AutoSmoothing: {
// For the AutoSmooth case, don't do anything! Keep the default settings.
break;
}
default:
ASSERT_NOT_REACHED();
}
if (font->platformData().useGDI() && !shouldUseFontSmoothing) {
drawGDIGlyphs(graphicsContext, font, glyphBuffer, from, numGlyphs, point);
return;
}
uint32_t oldFontSmoothingStyle = wkSetFontSmoothingStyle(cgContext, shouldUseFontSmoothing);
const FontPlatformData& platformData = font->platformData();
CGContextSetFont(cgContext, platformData.cgFont());
CGAffineTransform matrix = CGAffineTransformIdentity;
matrix.b = -matrix.b;
matrix.d = -matrix.d;
if (platformData.syntheticOblique()) {
static float skew = -tanf(syntheticObliqueAngle * piFloat / 180.0f);
matrix = CGAffineTransformConcat(matrix, CGAffineTransformMake(1, 0, skew, 1, 0, 0));
}
CGContextSetTextMatrix(cgContext, matrix);
// Uniscribe gives us offsets to help refine the positioning of combining glyphs.
FloatSize translation = glyphBuffer.offsetAt(from);
CGContextSetFontSize(cgContext, platformData.size());
wkSetCGContextFontRenderingStyle(cgContext, font->isSystemFont(), false, font->platformData().useGDI());
FloatSize shadowOffset;
float shadowBlur;
Color shadowColor;
ColorSpace shadowColorSpace;
graphicsContext->getShadow(shadowOffset, shadowBlur, shadowColor, shadowColorSpace);
bool hasSimpleShadow = graphicsContext->textDrawingMode() == TextModeFill && shadowColor.isValid() && !shadowBlur && (!graphicsContext->shadowsIgnoreTransforms() || graphicsContext->getCTM().isIdentityOrTranslationOrFlipped());
if (hasSimpleShadow) {
// Paint simple shadows ourselves instead of relying on CG shadows, to avoid losing subpixel antialiasing.
graphicsContext->clearShadow();
Color fillColor = graphicsContext->fillColor();
Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255);
graphicsContext->setFillColor(shadowFillColor, ColorSpaceDeviceRGB);
float shadowTextX = point.x() + translation.width() + shadowOffset.width();
// If shadows are ignoring transforms, then we haven't applied the Y coordinate flip yet, so down is negative.
float shadowTextY = point.y() + translation.height() + shadowOffset.height() * (graphicsContext->shadowsIgnoreTransforms() ? -1 : 1);
CGContextSetTextPosition(cgContext, shadowTextX, shadowTextY);
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
if (font->syntheticBoldOffset()) {
CGContextSetTextPosition(cgContext, point.x() + translation.width() + shadowOffset.width() + font->syntheticBoldOffset(), point.y() + translation.height() + shadowOffset.height());
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
}
graphicsContext->setFillColor(fillColor, ColorSpaceDeviceRGB);
}
CGContextSetTextPosition(cgContext, point.x() + translation.width(), point.y() + translation.height());
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
if (font->syntheticBoldOffset()) {
CGContextSetTextPosition(cgContext, point.x() + translation.width() + font->syntheticBoldOffset(), point.y() + translation.height());
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
}
if (hasSimpleShadow)
graphicsContext->setShadow(shadowOffset, shadowBlur, shadowColor, ColorSpaceDeviceRGB);
wkRestoreFontSmoothingStyle(cgContext, oldFontSmoothingStyle);
}
void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
int from, int numGlyphs, const FloatPoint& point) const
{
cairo_t* cr = context->platformContext();
cairo_save(cr);
font->setFont(cr);
GlyphBufferGlyph* glyphs = (GlyphBufferGlyph*)glyphBuffer.glyphs(from);
float offset = point.x();
for (int i = 0; i < numGlyphs; i++) {
glyphs[i].x = offset;
glyphs[i].y = point.y();
offset += glyphBuffer.advanceAt(from + i);
}
Color fillColor = context->fillColor();
// Text shadow, inspired by FontMac
IntSize shadowSize;
int shadowBlur = 0;
Color shadowColor;
bool hasShadow = context->textDrawingMode() == cTextFill &&
context->getShadow(shadowSize, shadowBlur, shadowColor);
// TODO: Blur support
if (hasShadow) {
// Disable graphics context shadows (not yet implemented) and paint them manually
context->clearShadow();
Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255);
cairo_save(cr);
float red, green, blue, alpha;
shadowFillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
cairo_translate(cr, shadowSize.width(), shadowSize.height());
cairo_show_glyphs(cr, glyphs, numGlyphs);
cairo_restore(cr);
}
if (context->textDrawingMode() & cTextFill) {
if (context->fillGradient()) {
cairo_set_source(cr, context->fillGradient()->platformGradient());
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
} else if (context->fillPattern()) {
TransformationMatrix affine;
cairo_set_source(cr, context->fillPattern()->createPlatformPattern(affine));
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
} else {
float red, green, blue, alpha;
fillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha * context->getAlpha());
}
cairo_show_glyphs(cr, glyphs, numGlyphs);
}
if (context->textDrawingMode() & cTextStroke) {
if (context->strokeGradient()) {
cairo_set_source(cr, context->strokeGradient()->platformGradient());
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
} else if (context->strokePattern()) {
TransformationMatrix affine;
cairo_set_source(cr, context->strokePattern()->createPlatformPattern(affine));
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
} else {
Color strokeColor = context->strokeColor();
float red, green, blue, alpha;
strokeColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha * context->getAlpha());
}
cairo_glyph_path(cr, glyphs, numGlyphs);
cairo_set_line_width(cr, context->strokeThickness());
cairo_stroke(cr);
}
// Re-enable the platform shadow we disabled earlier
if (hasShadow)
context->setShadow(shadowSize, shadowBlur, shadowColor);
cairo_restore(cr);
}
void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
int from, int numGlyphs, const FloatPoint& point) const
{
cairo_t* cr = context->platformContext();
cairo_save(cr);
cairo_set_scaled_font(cr, font->platformData().scaledFont());
GlyphBufferGlyph* glyphs = (GlyphBufferGlyph*)glyphBuffer.glyphs(from);
float offset = 0.0f;
for (int i = 0; i < numGlyphs; i++) {
glyphs[i].x = offset;
glyphs[i].y = 0.0f;
offset += glyphBuffer.advanceAt(from + i);
}
Color fillColor = context->fillColor();
// Synthetic Oblique
if(font->platformData().syntheticOblique()) {
cairo_matrix_t mat = {1, 0, -tanf(SYNTHETIC_OBLIQUE_ANGLE * acosf(0) / 90), 1, point.x(), point.y()};
cairo_transform(cr, &mat);
} else {
cairo_translate(cr, point.x(), point.y());
}
// Text shadow, inspired by FontMac
FloatSize shadowOffset;
float shadowBlur = 0;
Color shadowColor;
bool hasShadow = context->textDrawingMode() & cTextFill
&& context->getShadow(shadowOffset, shadowBlur, shadowColor);
// TODO: Blur support
if (hasShadow) {
// Disable graphics context shadows (not yet implemented) and paint them manually
context->clearShadow();
Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255);
cairo_save(cr);
float red, green, blue, alpha;
shadowFillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
#if ENABLE(FILTERS)
cairo_text_extents_t extents;
cairo_scaled_font_glyph_extents(font->platformData().scaledFont(), glyphs, numGlyphs, &extents);
FloatRect rect(FloatPoint(), FloatSize(extents.width, extents.height));
IntSize shadowBufferSize;
FloatRect shadowRect;
float radius = 0;
context->calculateShadowBufferDimensions(shadowBufferSize, shadowRect, radius, rect, shadowOffset, shadowBlur);
// Draw shadow into a new ImageBuffer
OwnPtr<ImageBuffer> shadowBuffer = ImageBuffer::create(shadowBufferSize);
GraphicsContext* shadowContext = shadowBuffer->context();
cairo_t* shadowCr = shadowContext->platformContext();
cairo_translate(shadowCr, radius, extents.height + radius);
cairo_set_scaled_font(shadowCr, font->platformData().scaledFont());
cairo_show_glyphs(shadowCr, glyphs, numGlyphs);
if (font->syntheticBoldOffset()) {
cairo_save(shadowCr);
cairo_translate(shadowCr, font->syntheticBoldOffset(), 0);
cairo_show_glyphs(shadowCr, glyphs, numGlyphs);
cairo_restore(shadowCr);
}
cairo_translate(cr, 0.0, -extents.height);
context->applyPlatformShadow(shadowBuffer.release(), shadowColor, shadowRect, radius);
#else
cairo_translate(cr, shadowOffset.width(), shadowOffset.height());
cairo_show_glyphs(cr, glyphs, numGlyphs);
if (font->syntheticBoldOffset()) {
cairo_save(cr);
cairo_translate(cr, font->syntheticBoldOffset(), 0);
cairo_show_glyphs(cr, glyphs, numGlyphs);
cairo_restore(cr);
}
#endif
cairo_restore(cr);
}
if (context->textDrawingMode() & cTextFill) {
if (context->fillGradient()) {
cairo_set_source(cr, context->fillGradient()->platformGradient());
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
} else if (context->fillPattern()) {
AffineTransform affine;
cairo_pattern_t* pattern = context->fillPattern()->createPlatformPattern(affine);
cairo_set_source(cr, pattern);
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
cairo_pattern_destroy(pattern);
} else {
float red, green, blue, alpha;
fillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha * context->getAlpha());
}
cairo_show_glyphs(cr, glyphs, numGlyphs);
if (font->syntheticBoldOffset()) {
cairo_save(cr);
cairo_translate(cr, font->syntheticBoldOffset(), 0);
cairo_show_glyphs(cr, glyphs, numGlyphs);
cairo_restore(cr);
}
}
// Prevent running into a long computation within cairo. If the stroke width is
// twice the size of the width of the text we will not ask cairo to stroke
// the text as even one single stroke would cover the full wdth of the text.
// See https://bugs.webkit.org/show_bug.cgi?id=33759.
if (context->textDrawingMode() & cTextStroke && context->strokeThickness() < 2 * offset) {
if (context->strokeGradient()) {
cairo_set_source(cr, context->strokeGradient()->platformGradient());
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
} else if (context->strokePattern()) {
AffineTransform affine;
cairo_pattern_t* pattern = context->strokePattern()->createPlatformPattern(affine);
cairo_set_source(cr, pattern);
if (context->getAlpha() < 1.0f) {
cairo_push_group(cr);
cairo_paint_with_alpha(cr, context->getAlpha());
cairo_pop_group_to_source(cr);
}
cairo_pattern_destroy(pattern);
} else {
Color strokeColor = context->strokeColor();
float red, green, blue, alpha;
strokeColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha * context->getAlpha());
}
cairo_glyph_path(cr, glyphs, numGlyphs);
cairo_set_line_width(cr, context->strokeThickness());
cairo_stroke(cr);
}
// Re-enable the platform shadow we disabled earlier
if (hasShadow)
context->setShadow(shadowOffset, shadowBlur, shadowColor, DeviceColorSpace);
cairo_restore(cr);
}
void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
cairo_t* cr = context->platformContext();
cairo_save(cr);
cairo_translate(cr, point.x(), point.y());
PangoLayout* layout = pango_cairo_create_layout(cr);
setPangoAttributes(this, run, layout);
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
pango_layout_set_text(layout, utf8, -1);
// Our layouts are single line
PangoLayoutLine* layoutLine = pango_layout_get_line_readonly(layout, 0);
GdkRegion* partialRegion = NULL;
if (to - from != run.length()) {
// Clip the region of the run to be rendered
char* start = g_utf8_offset_to_pointer(utf8, from);
char* end = g_utf8_offset_to_pointer(start, to - from);
int ranges[] = {start - utf8, end - utf8};
partialRegion = gdk_pango_layout_line_get_clip_region(layoutLine, 0, 0, ranges, 1);
gdk_region_shrink(partialRegion, 0, -pixelSize());
}
Color fillColor = context->fillColor();
float red, green, blue, alpha;
// Text shadow, inspired by FontMac
IntSize shadowSize;
int shadowBlur = 0;
Color shadowColor;
bool hasShadow = context->textDrawingMode() == cTextFill &&
context->getShadow(shadowSize, shadowBlur, shadowColor);
// TODO: Blur support
if (hasShadow) {
// Disable graphics context shadows (not yet implemented) and paint them manually
context->clearShadow();
Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255);
cairo_save(cr);
shadowFillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
cairo_translate(cr, shadowSize.width(), shadowSize.height());
if (partialRegion) {
gdk_cairo_region(cr, partialRegion);
cairo_clip(cr);
}
pango_cairo_show_layout_line(cr, layoutLine);
cairo_restore(cr);
}
fillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
if (partialRegion) {
gdk_cairo_region(cr, partialRegion);
cairo_clip(cr);
}
pango_cairo_show_layout_line(cr, layoutLine);
if (context->textDrawingMode() & cTextStroke) {
Color strokeColor = context->strokeColor();
strokeColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
pango_cairo_layout_line_path(cr, layoutLine);
cairo_set_line_width(cr, context->strokeThickness());
cairo_stroke(cr);
}
// Re-enable the platform shadow we disabled earlier
if (hasShadow)
context->setShadow(shadowSize, shadowBlur, shadowColor);
// Pango sometimes leaves behind paths we don't want
cairo_new_path(cr);
if (partialRegion)
gdk_region_destroy(partialRegion);
g_free(utf8);
g_object_unref(layout);
cairo_restore(cr);
}
void Font::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
int from, int numGlyphs, const FloatPoint& point) const
{
CGContextRef cgContext = graphicsContext->platformContext();
bool shouldUseFontSmoothing = WebCoreShouldUseFontSmoothing();
if (font->platformData().useGDI()) {
static bool canUsePlatformNativeGlyphs = wkCanUsePlatformNativeGlyphs();
if (!canUsePlatformNativeGlyphs || !shouldUseFontSmoothing || (graphicsContext->textDrawingMode() & cTextStroke)) {
drawGDIGlyphs(graphicsContext, font, glyphBuffer, from, numGlyphs, point);
return;
}
}
uint32_t oldFontSmoothingStyle = wkSetFontSmoothingStyle(cgContext, shouldUseFontSmoothing);
const FontPlatformData& platformData = font->platformData();
CGContextSetFont(cgContext, platformData.cgFont());
CGAffineTransform matrix = CGAffineTransformIdentity;
matrix.b = -matrix.b;
matrix.d = -matrix.d;
if (platformData.syntheticOblique()) {
static float skew = -tanf(syntheticObliqueAngle * piFloat / 180.0f);
matrix = CGAffineTransformConcat(matrix, CGAffineTransformMake(1, 0, skew, 1, 0, 0));
}
CGContextSetTextMatrix(cgContext, matrix);
// Uniscribe gives us offsets to help refine the positioning of combining glyphs.
FloatSize translation = glyphBuffer.offsetAt(from);
CGContextSetFontSize(cgContext, platformData.size());
wkSetCGContextFontRenderingStyle(cgContext, font->isSystemFont(), false, font->platformData().useGDI());
IntSize shadowSize;
int shadowBlur;
Color shadowColor;
graphicsContext->getShadow(shadowSize, shadowBlur, shadowColor);
bool hasSimpleShadow = graphicsContext->textDrawingMode() == cTextFill && shadowColor.isValid() && !shadowBlur;
if (hasSimpleShadow) {
// Paint simple shadows ourselves instead of relying on CG shadows, to avoid losing subpixel antialiasing.
graphicsContext->clearShadow();
Color fillColor = graphicsContext->fillColor();
Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255);
graphicsContext->setFillColor(shadowFillColor);
CGContextSetTextPosition(cgContext, point.x() + translation.width() + shadowSize.width(), point.y() + translation.height() + shadowSize.height());
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
if (font->m_syntheticBoldOffset) {
CGContextSetTextPosition(cgContext, point.x() + translation.width() + shadowSize.width() + font->m_syntheticBoldOffset, point.y() + translation.height() + shadowSize.height());
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
}
graphicsContext->setFillColor(fillColor);
}
CGContextSetTextPosition(cgContext, point.x() + translation.width(), point.y() + translation.height());
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
if (font->m_syntheticBoldOffset) {
CGContextSetTextPosition(cgContext, point.x() + translation.width() + font->m_syntheticBoldOffset, point.y() + translation.height());
CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);
}
if (hasSimpleShadow)
graphicsContext->setShadow(shadowSize, shadowBlur, shadowColor);
wkRestoreFontSmoothingStyle(cgContext, oldFontSmoothingStyle);
}
