BitmapImage::BitmapImage(PassRefPtr<cairo_surface_t> nativeImage, ImageObserver* observer)
: Image(observer)
, m_size(cairoSurfaceSize(nativeImage.get()))
, m_minimumSubsamplingLevel(0)
, m_currentFrame(0)
, m_repetitionCount(cAnimationNone)
, m_repetitionCountStatus(Unknown)
, m_repetitionsComplete(0)
, m_decodedSize(m_size.width() * m_size.height() * 4)
, m_frameCount(1)
, m_isSolidColor(false)
, m_checkedForSolidColor(false)
, m_animationFinished(true)
, m_allDataReceived(true)
, m_haveSize(true)
, m_sizeAvailable(true)
, m_haveFrameCount(true)
{
m_frames.grow(1);
m_frames[0].m_hasAlpha = cairo_surface_get_content(nativeImage.get()) != CAIRO_CONTENT_COLOR;
m_frames[0].m_frame = nativeImage;
m_frames[0].m_haveMetadata = true;
checkForSolidColor();
}
void BitmapImage::checkForSolidColor()
{
m_isSolidColor = false;
m_checkedForSolidColor = true;
if (frameCount() > 1)
return;
RefPtr<cairo_surface_t> surface = frameAtIndex(m_currentFrame);
if (!surface) // If it's too early we won't have an image yet.
return;
if (cairo_surface_get_type(surface.get()) != CAIRO_SURFACE_TYPE_IMAGE)
return;
IntSize size = cairoSurfaceSize(surface.get());
if (size.width() != 1 || size.height() != 1)
return;
unsigned* pixelColor = reinterpret_cast_ptr<unsigned*>(cairo_image_surface_get_data(surface.get()));
m_solidColor = colorFromPremultipliedARGB(*pixelColor);
m_isSolidColor = true;
}
void BitmapImage::draw(GraphicsContext& context, const FloatRect& dst, const FloatRect& src, CompositeOperator op,
BlendMode blendMode, ImageOrientationDescription description)
{
if (!dst.width() || !dst.height() || !src.width() || !src.height())
return;
startAnimation();
auto surface = frameImageAtIndex(m_currentFrame);
if (!surface) // If it's too early we won't have an image yet.
return;
Color color = singlePixelSolidColor();
if (color.isValid()) {
fillWithSolidColor(context, dst, color, op);
return;
}
context.save();
// Set the compositing operation.
if (op == CompositeSourceOver && blendMode == BlendModeNormal && !frameHasAlphaAtIndex(m_currentFrame))
context.setCompositeOperation(CompositeCopy);
else
context.setCompositeOperation(op, blendMode);
#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING)
IntSize scaledSize = cairoSurfaceSize(surface.get());
FloatRect adjustedSrcRect = adjustSourceRectForDownSampling(src, scaledSize);
#else
FloatRect adjustedSrcRect(src);
#endif
ImageOrientation frameOrientation(description.imageOrientation());
if (description.respectImageOrientation() == RespectImageOrientation)
frameOrientation = frameOrientationAtIndex(m_currentFrame);
FloatRect dstRect = dst;
if (frameOrientation != DefaultImageOrientation) {
// ImageOrientation expects the origin to be at (0, 0).
context.translate(dstRect.x(), dstRect.y());
dstRect.setLocation(FloatPoint());
context.concatCTM(frameOrientation.transformFromDefault(dstRect.size()));
if (frameOrientation.usesWidthAsHeight()) {
// The destination rectangle will have it's width and height already reversed for the orientation of
// the image, as it was needed for page layout, so we need to reverse it back here.
dstRect = FloatRect(dstRect.x(), dstRect.y(), dstRect.height(), dstRect.width());
}
}
context.platformContext()->drawSurfaceToContext(surface.get(), dstRect, adjustedSrcRect, context);
context.restore();
if (imageObserver())
imageObserver()->didDraw(this);
}
static bool encodeImage(cairo_surface_t* surface, const String& mimeType, std::optional<double> quality, GUniqueOutPtr<gchar>& buffer, gsize& bufferSize)
{
// List of supported image encoding types comes from the GdkPixbuf documentation.
// http://developer.gnome.org/gdk-pixbuf/stable/gdk-pixbuf-File-saving.html#gdk-pixbuf-save-to-bufferv
String type = mimeType.substring(sizeof "image");
if (type != "jpeg" && type != "png" && type != "tiff" && type != "ico" && type != "bmp")
return false;
GRefPtr<GdkPixbuf> pixbuf;
if (type == "jpeg") {
// JPEG doesn't support alpha channel. The <canvas> spec states that toDataURL() must encode a Porter-Duff
// composite source-over black for image types that do not support alpha.
RefPtr<cairo_surface_t> newSurface;
if (cairo_surface_get_type(surface) == CAIRO_SURFACE_TYPE_IMAGE) {
newSurface = adoptRef(cairo_image_surface_create_for_data(cairo_image_surface_get_data(surface),
CAIRO_FORMAT_RGB24,
cairo_image_surface_get_width(surface),
cairo_image_surface_get_height(surface),
cairo_image_surface_get_stride(surface)));
} else {
IntSize size = cairoSurfaceSize(surface);
newSurface = adoptRef(cairo_image_surface_create(CAIRO_FORMAT_RGB24, size.width(), size.height()));
RefPtr<cairo_t> cr = adoptRef(cairo_create(newSurface.get()));
cairo_set_source_surface(cr.get(), surface, 0, 0);
cairo_paint(cr.get());
}
pixbuf = adoptGRef(cairoSurfaceToGdkPixbuf(newSurface.get()));
} else
pixbuf = adoptGRef(cairoSurfaceToGdkPixbuf(surface));
if (!pixbuf)
return false;
GUniqueOutPtr<GError> error;
if (type == "jpeg" && quality && *quality >= 0.0 && *quality <= 1.0) {
String qualityString = String::format("%d", static_cast<int>(*quality * 100.0 + 0.5));
gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize, type.utf8().data(), &error.outPtr(), "quality", qualityString.utf8().data(), NULL);
} else
gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize, type.utf8().data(), &error.outPtr(), NULL);
return !error;
}
IntSize size(const RefPtr<cairo_surface_t>& image)
{
return cairoSurfaceSize(image.get());
}
bool GraphicsContext3D::ImageExtractor::extractImage(bool premultiplyAlpha, bool ignoreGammaAndColorProfile)
{
if (!m_image)
return false;
// We need this to stay in scope because the native image is just a shallow copy of the data.
m_decoder = new ImageSource(premultiplyAlpha ? ImageSource::AlphaPremultiplied : ImageSource::AlphaNotPremultiplied, ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied);
if (!m_decoder)
return false;
ImageSource& decoder = *m_decoder;
m_alphaOp = AlphaDoNothing;
if (m_image->data()) {
decoder.setData(m_image->data(), true);
if (!decoder.frameCount() || !decoder.frameIsCompleteAtIndex(0))
return false;
m_imageSurface = decoder.createFrameAtIndex(0);
} else {
m_imageSurface = m_image->nativeImageForCurrentFrame();
// 1. For texImage2D with HTMLVideoElment input, assume no PremultiplyAlpha had been applied and the alpha value is 0xFF for each pixel,
// which is true at present and may be changed in the future and needs adjustment accordingly.
// 2. For texImage2D with HTMLCanvasElement input in which Alpha is already Premultiplied in this port,
// do AlphaDoUnmultiply if UNPACK_PREMULTIPLY_ALPHA_WEBGL is set to false.
if (!premultiplyAlpha && m_imageHtmlDomSource != HtmlDomVideo)
m_alphaOp = AlphaDoUnmultiply;
// if m_imageSurface is not an image, extract a copy of the surface
if (m_imageSurface && cairo_surface_get_type(m_imageSurface.get()) != CAIRO_SURFACE_TYPE_IMAGE) {
RefPtr<cairo_surface_t> tmpSurface = adoptRef(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, m_imageWidth, m_imageHeight));
copyRectFromOneSurfaceToAnother(m_imageSurface.get(), tmpSurface.get(), IntSize(), IntRect(0, 0, m_imageWidth, m_imageHeight), IntSize(), CAIRO_OPERATOR_SOURCE);
m_imageSurface = tmpSurface.release();
}
}
if (!m_imageSurface)
return false;
ASSERT(cairo_surface_get_type(m_imageSurface.get()) == CAIRO_SURFACE_TYPE_IMAGE);
IntSize imageSize = cairoSurfaceSize(m_imageSurface.get());
m_imageWidth = imageSize.width();
m_imageHeight = imageSize.height();
if (!m_imageWidth || !m_imageHeight)
return false;
if (cairo_image_surface_get_format(m_imageSurface.get()) != CAIRO_FORMAT_ARGB32)
return false;
unsigned int srcUnpackAlignment = 1;
size_t bytesPerRow = cairo_image_surface_get_stride(m_imageSurface.get());
size_t bitsPerPixel = 32;
unsigned padding = bytesPerRow - bitsPerPixel / 8 * m_imageWidth;
if (padding) {
srcUnpackAlignment = padding + 1;
while (bytesPerRow % srcUnpackAlignment)
++srcUnpackAlignment;
}
m_imagePixelData = cairo_image_surface_get_data(m_imageSurface.get());
m_imageSourceFormat = DataFormatBGRA8;
m_imageSourceUnpackAlignment = srcUnpackAlignment;
return true;
}
void PlatformContextCairo::drawSurfaceToContext(cairo_surface_t* surface, const FloatRect& destRect, const FloatRect& originalSrcRect, GraphicsContext& context)
{
// Avoid invalid cairo matrix with small values.
if (std::fabs(destRect.width()) < 0.5f || std::fabs(destRect.height()) < 0.5f)
return;
FloatRect srcRect = originalSrcRect;
// We need to account for negative source dimensions by flipping the rectangle.
if (originalSrcRect.width() < 0) {
srcRect.setX(originalSrcRect.x() + originalSrcRect.width());
srcRect.setWidth(std::fabs(originalSrcRect.width()));
}
if (originalSrcRect.height() < 0) {
srcRect.setY(originalSrcRect.y() + originalSrcRect.height());
srcRect.setHeight(std::fabs(originalSrcRect.height()));
}
RefPtr<cairo_surface_t> patternSurface = surface;
float leftPadding = 0;
float topPadding = 0;
if (srcRect.x() || srcRect.y() || srcRect.size() != cairoSurfaceSize(surface)) {
// Cairo subsurfaces don't support floating point boundaries well, so we expand the rectangle.
IntRect expandedSrcRect(enclosingIntRect(srcRect));
// We use a subsurface here so that we don't end up sampling outside the originalSrcRect rectangle.
// See https://bugs.webkit.org/show_bug.cgi?id=58309
patternSurface = adoptRef(cairo_surface_create_for_rectangle(surface, expandedSrcRect.x(),
expandedSrcRect.y(), expandedSrcRect.width(), expandedSrcRect.height()));
leftPadding = static_cast<float>(expandedSrcRect.x()) - floorf(srcRect.x());
topPadding = static_cast<float>(expandedSrcRect.y()) - floorf(srcRect.y());
}
RefPtr<cairo_pattern_t> pattern = adoptRef(cairo_pattern_create_for_surface(patternSurface.get()));
ASSERT(m_state);
switch (m_state->m_imageInterpolationQuality) {
case InterpolationNone:
case InterpolationLow:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_FAST);
break;
case InterpolationMedium:
case InterpolationDefault:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_GOOD);
break;
case InterpolationHigh:
cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_BEST);
break;
}
cairo_pattern_set_extend(pattern.get(), CAIRO_EXTEND_PAD);
// The pattern transformation properly scales the pattern for when the source rectangle is a
// different size than the destination rectangle. We also account for any offset we introduced
// by expanding floating point source rectangle sizes. It's important to take the absolute value
// of the scale since the original width and height might be negative.
float scaleX = std::fabs(srcRect.width() / destRect.width());
float scaleY = std::fabs(srcRect.height() / destRect.height());
cairo_matrix_t matrix = { scaleX, 0, 0, scaleY, leftPadding, topPadding };
cairo_pattern_set_matrix(pattern.get(), &matrix);
ShadowBlur& shadow = context.platformContext()->shadowBlur();
if (shadow.type() != ShadowBlur::NoShadow) {
if (GraphicsContext* shadowContext = shadow.beginShadowLayer(context, destRect)) {
drawPatternToCairoContext(shadowContext->platformContext()->cr(), pattern.get(), destRect, 1);
shadow.endShadowLayer(context);
}
}
cairo_save(m_cr.get());
drawPatternToCairoContext(m_cr.get(), pattern.get(), destRect, globalAlpha());
cairo_restore(m_cr.get());
}
IntSize nativeImageSize(const NativeImagePtr& image)
{
return image ? cairoSurfaceSize(image.get()) : IntSize();
}
