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/*
* Copyright (C) 2010, 2016 Apple Inc. All rights reserved.
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2010 Mozilla Corporation. 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 "GraphicsContextGLOpenGL.h"
#if ENABLE(WEBGL)
#include "ExtensionsGL.h"
#include "ImageBuffer.h"
#include "MediaPlayerPrivate.h"
#include "PixelBuffer.h"
#include <wtf/UniqueArray.h>
#if USE(AVFOUNDATION)
#include "GraphicsContextGLCV.h"
#endif
#include <memory>
namespace WebCore {
void GraphicsContextGLOpenGL::resetBuffersToAutoClear()
{
GCGLuint buffers = GraphicsContextGL::COLOR_BUFFER_BIT;
// The GraphicsContextGL's attributes (as opposed to
// WebGLRenderingContext's) indicate whether there is an
// implicitly-allocated stencil buffer, for example.
auto attrs = contextAttributes();
if (attrs.depth)
buffers |= GraphicsContextGL::DEPTH_BUFFER_BIT;
if (attrs.stencil)
buffers |= GraphicsContextGL::STENCIL_BUFFER_BIT;
setBuffersToAutoClear(buffers);
}
void GraphicsContextGLOpenGL::setBuffersToAutoClear(GCGLbitfield buffers)
{
auto attrs = contextAttributes();
if (!attrs.preserveDrawingBuffer)
m_buffersToAutoClear = buffers;
else
ASSERT(!m_buffersToAutoClear);
}
GCGLbitfield GraphicsContextGLOpenGL::getBuffersToAutoClear() const
{
return m_buffersToAutoClear;
}
void GraphicsContextGLOpenGL::enablePreserveDrawingBuffer()
{
GraphicsContextGL::enablePreserveDrawingBuffer();
// After dynamically transitioning to preserveDrawingBuffer:true
// for canvas capture, clear out any buffer auto-clearing state.
m_buffersToAutoClear = 0;
}
#if !USE(ANGLE)
bool GraphicsContextGLOpenGL::texImage2DResourceSafe(GCGLenum target, GCGLint level, GCGLenum internalformat, GCGLsizei width, GCGLsizei height, GCGLint border, GCGLenum format, GCGLenum type, GCGLint unpackAlignment)
{
ASSERT(unpackAlignment == 1 || unpackAlignment == 2 || unpackAlignment == 4 || unpackAlignment == 8);
UniqueArray<unsigned char> zero;
unsigned size = 0;
if (width > 0 && height > 0) {
PixelStoreParams params;
params.alignment = unpackAlignment;
GCGLenum error = computeImageSizeInBytes(format, type, width, height, 1, params, &size, nullptr, nullptr);
if (error != GraphicsContextGL::NO_ERROR) {
synthesizeGLError(error);
return false;
}
zero = makeUniqueArray<unsigned char>(size);
if (!zero) {
synthesizeGLError(GraphicsContextGL::INVALID_VALUE);
return false;
}
memset(zero.get(), 0, size);
}
texImage2D(target, level, internalformat, width, height, border, format, type, makeGCGLSpan(zero.get(), size));
return true;
}
#endif
#if !PLATFORM(COCOA)
void GraphicsContextGLOpenGL::setContextVisibility(bool)
{
}
void GraphicsContextGLOpenGL::simulateEventForTesting(SimulatedEventForTesting event)
{
if (event == SimulatedEventForTesting::GPUStatusFailure)
m_failNextStatusCheck = true;
}
void GraphicsContextGLOpenGL::prepareForDisplay()
{
}
#endif
void GraphicsContextGLOpenGL::paintRenderingResultsToCanvas(ImageBuffer& imageBuffer)
{
if (!makeContextCurrent())
return;
if (getInternalFramebufferSize().isEmpty())
return;
auto pixelBuffer = readRenderingResults();
if (!pixelBuffer)
return;
paintToCanvas(contextAttributes(), WTFMove(*pixelBuffer), imageBuffer.backendSize(), imageBuffer.context());
}
void GraphicsContextGLOpenGL::paintCompositedResultsToCanvas(ImageBuffer& imageBuffer)
{
if (!makeContextCurrent())
return;
if (getInternalFramebufferSize().isEmpty())
return;
auto pixelBuffer = readCompositedResults();
if (!pixelBuffer)
return;
paintToCanvas(contextAttributes(), WTFMove(*pixelBuffer), imageBuffer.backendSize(), imageBuffer.context());
}
std::optional<PixelBuffer> GraphicsContextGLOpenGL::paintRenderingResultsToPixelBuffer()
{
// Reading premultiplied alpha would involve unpremultiplying, which is lossy.
if (contextAttributes().premultipliedAlpha)
return std::nullopt;
auto results = readRenderingResultsForPainting();
if (results && !results->size().isEmpty()) {
ASSERT(results->format().pixelFormat == PixelFormat::RGBA8 || results->format().pixelFormat == PixelFormat::BGRA8);
// FIXME: Make PixelBufferConversions support negative rowBytes and in-place conversions.
const auto size = results->size();
const size_t rowStride = size.width() * 4;
uint8_t* top = results->data().data();
uint8_t* bottom = top + (size.height() - 1) * rowStride;
std::unique_ptr<uint8_t[]> temp(new uint8_t[rowStride]);
for (; top < bottom; top += rowStride, bottom -= rowStride) {
memcpy(temp.get(), bottom, rowStride);
memcpy(bottom, top, rowStride);
memcpy(top, temp.get(), rowStride);
}
}
return results;
}
std::optional<PixelBuffer> GraphicsContextGLOpenGL::readRenderingResultsForPainting()
{
if (!makeContextCurrent())
return std::nullopt;
if (getInternalFramebufferSize().isEmpty())
return std::nullopt;
return readRenderingResults();
}
std::optional<PixelBuffer> GraphicsContextGLOpenGL::readCompositedResultsForPainting()
{
if (!makeContextCurrent())
return std::nullopt;
if (getInternalFramebufferSize().isEmpty())
return std::nullopt;
return readCompositedResults();
}
#if !PLATFORM(COCOA)
std::optional<PixelBuffer> GraphicsContextGLOpenGL::readCompositedResults()
{
return readRenderingResults();
}
#endif
#if ENABLE(VIDEO)
bool GraphicsContextGLOpenGL::copyTextureFromMedia(MediaPlayer& player, PlatformGLObject outputTexture, GCGLenum outputTarget, GCGLint level, GCGLenum internalFormat, GCGLenum format, GCGLenum type, bool premultiplyAlpha, bool flipY)
{
#if USE(AVFOUNDATION)
auto pixelBuffer = player.pixelBufferForCurrentTime();
if (!pixelBuffer)
return false;
auto contextCV = asCV();
if (!contextCV)
return false;
UNUSED_VARIABLE(premultiplyAlpha);
ASSERT_UNUSED(outputTarget, outputTarget == GraphicsContextGL::TEXTURE_2D);
return contextCV->copyPixelBufferToTexture(pixelBuffer.get(), outputTexture, level, internalFormat, format, type, GraphicsContextGL::FlipY(flipY));
#else
return player.copyVideoTextureToPlatformTexture(this, outputTexture, outputTarget, level, internalFormat, format, type, premultiplyAlpha, flipY);
#endif
}
#endif
} // namespace WebCore
#endif // ENABLE(WEBGL)
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