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/*
* Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2007 Holger Hans Peter Freyther <zecke@selfish.org>
* Copyright (C) 2008, 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
* Copyright (C) 2010 Igalia S.L.
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ImageBufferUtilitiesCairo.h"
#if USE(CAIRO)
#include "CairoUtilities.h"
#include "MIMETypeRegistry.h"
#include "RefPtrCairo.h"
#include <cairo.h>
#include <wtf/text/Base64.h>
#include <wtf/text/CString.h>
#include <wtf/text/WTFString.h>
#if PLATFORM(GTK)
#include "GRefPtrGtk.h"
#include "GdkCairoUtilities.h"
#include <gtk/gtk.h>
#include <wtf/glib/GUniquePtr.h>
#endif
namespace WebCore {
#if !PLATFORM(GTK)
static cairo_status_t writeFunction(void* output, const unsigned char* data, unsigned length)
{
if (!reinterpret_cast<Vector<uint8_t>*>(output)->tryAppend(data, length))
return CAIRO_STATUS_WRITE_ERROR;
return CAIRO_STATUS_SUCCESS;
}
static bool encodeImage(cairo_surface_t* image, const String& mimeType, Vector<uint8_t>* output)
{
ASSERT_UNUSED(mimeType, mimeType == "image/png"); // Only PNG output is supported for now.
return cairo_surface_write_to_png_stream(image, writeFunction, output) == CAIRO_STATUS_SUCCESS;
}
Vector<uint8_t> data(cairo_surface_t* image, const String& mimeType, std::optional<double>)
{
Vector<uint8_t> encodedImage;
if (!image || !encodeImage(image, mimeType, &encodedImage))
return { };
return encodedImage;
}
#else
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::number(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;
}
Vector<uint8_t> data(cairo_surface_t* image, const String& mimeType, std::optional<double> quality)
{
GUniqueOutPtr<gchar> buffer;
gsize bufferSize;
if (!encodeImage(image, mimeType, quality, buffer, bufferSize))
return { };
return { reinterpret_cast<const uint8_t*>(buffer.get()), bufferSize };
}
#endif // !PLATFORM(GTK)
} // namespace WebCore
#endif // USE(CAIRO)
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