ImageBufferGtk.cpp [plain text]
#include "config.h"
#include "ImageBuffer.h"
#include "CairoUtilities.h"
#include "GdkCairoUtilities.h"
#include "GRefPtrGtk.h"
#include "MIMETypeRegistry.h"
#include <cairo.h>
#include <gtk/gtk.h>
#include <wtf/gobject/GUniquePtr.h>
#include <wtf/text/Base64.h>
#include <wtf/text/CString.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
static bool encodeImage(cairo_surface_t* surface, const String& mimeType, const double* quality, GUniqueOutPtr<gchar>& buffer, gsize& bufferSize)
{
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") {
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;
}
String ImageBuffer::toDataURL(const String& mimeType, const double* quality, CoordinateSystem) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
GUniqueOutPtr<gchar> buffer;
gsize bufferSize;
if (!encodeImage(m_data.m_surface.get(), mimeType, quality, buffer, bufferSize))
return "data:,";
Vector<char> base64Data;
base64Encode(buffer.get(), bufferSize, base64Data);
return "data:" + mimeType + ";base64," + base64Data;
}
}