#include "config.h"
#include "ImageBuffer.h"
#include "GraphicsContext.h"
#include "IntRect.h"
#include <wtf/MathExtras.h>
namespace WebCore {
static const float MaxClampedLength = 4096;
static const float MaxClampedArea = MaxClampedLength * MaxClampedLength;
bool ImageBuffer::sizeNeedsClamping(const FloatSize& size)
{
if (size.isEmpty())
return false;
return floorf(size.height()) * floorf(size.width()) > MaxClampedArea;
}
bool ImageBuffer::sizeNeedsClamping(const FloatSize& size, FloatSize& scale)
{
FloatSize scaledSize(size);
scaledSize.scale(scale.width(), scale.height());
if (!sizeNeedsClamping(scaledSize))
return false;
scale.scale(sqrtf(MaxClampedArea / (scaledSize.width() * scaledSize.height())));
ASSERT(!sizeNeedsClamping(size, scale));
return true;
}
FloatSize ImageBuffer::clampedSize(const FloatSize& size)
{
return size.shrunkTo(FloatSize(MaxClampedLength, MaxClampedLength));
}
FloatSize ImageBuffer::clampedSize(const FloatSize& size, FloatSize& scale)
{
if (size.isEmpty())
return size;
FloatSize clampedSize = ImageBuffer::clampedSize(size);
scale = FloatSize(clampedSize.width() / size.width(), clampedSize.height() / size.height());
ASSERT(!sizeNeedsClamping(clampedSize));
ASSERT(!sizeNeedsClamping(size, scale));
return clampedSize;
}
FloatRect ImageBuffer::clampedRect(const FloatRect& rect)
{
return FloatRect(rect.location(), clampedSize(rect.size()));
}
#if !USE(CG)
void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace)
{
DEPRECATED_DEFINE_STATIC_LOCAL(Vector<int>, deviceRgbLUT, ());
DEPRECATED_DEFINE_STATIC_LOCAL(Vector<int>, linearRgbLUT, ());
if (srcColorSpace == dstColorSpace)
return;
if ((srcColorSpace != ColorSpaceLinearRGB && srcColorSpace != ColorSpaceDeviceRGB)
|| (dstColorSpace != ColorSpaceLinearRGB && dstColorSpace != ColorSpaceDeviceRGB))
return;
if (dstColorSpace == ColorSpaceLinearRGB) {
if (linearRgbLUT.isEmpty()) {
for (unsigned i = 0; i < 256; i++) {
float color = i / 255.0f;
color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) / 1.055f, 2.4f));
color = std::max(0.0f, color);
color = std::min(1.0f, color);
linearRgbLUT.append(static_cast<int>(round(color * 255)));
}
}
platformTransformColorSpace(linearRgbLUT);
} else if (dstColorSpace == ColorSpaceDeviceRGB) {
if (deviceRgbLUT.isEmpty()) {
for (unsigned i = 0; i < 256; i++) {
float color = i / 255.0f;
color = (powf(color, 1.0f / 2.4f) * 1.055f) - 0.055f;
color = std::max(0.0f, color);
color = std::min(1.0f, color);
deviceRgbLUT.append(static_cast<int>(round(color * 255)));
}
}
platformTransformColorSpace(deviceRgbLUT);
}
}
#endif // USE(CG)
inline void ImageBuffer::genericConvertToLuminanceMask()
{
IntRect luminanceRect(IntPoint(), internalSize());
RefPtr<Uint8ClampedArray> srcPixelArray = getUnmultipliedImageData(luminanceRect);
unsigned pixelArrayLength = srcPixelArray->length();
for (unsigned pixelOffset = 0; pixelOffset < pixelArrayLength; pixelOffset += 4) {
unsigned char a = srcPixelArray->item(pixelOffset + 3);
if (!a)
continue;
unsigned char r = srcPixelArray->item(pixelOffset);
unsigned char g = srcPixelArray->item(pixelOffset + 1);
unsigned char b = srcPixelArray->item(pixelOffset + 2);
double luma = (r * 0.2125 + g * 0.7154 + b * 0.0721) * ((double)a / 255.0);
srcPixelArray->set(pixelOffset + 3, luma);
}
putByteArray(Unmultiplied, srcPixelArray.get(), luminanceRect.size(), luminanceRect, IntPoint());
}
void ImageBuffer::convertToLuminanceMask()
{
genericConvertToLuminanceMask();
}
#if !USE(CAIRO)
PlatformLayer* ImageBuffer::platformLayer() const
{
return 0;
}
#endif
bool ImageBuffer::copyToPlatformTexture(GraphicsContext3D&, Platform3DObject, GC3Denum, bool, bool)
{
return false;
}
std::unique_ptr<ImageBuffer> ImageBuffer::createCompatibleBuffer(const FloatSize& size, float resolutionScale, ColorSpace colorSpace, const GraphicsContext* context, bool)
{
return create(size, resolutionScale, colorSpace, context->isAcceleratedContext() ? Accelerated : Unaccelerated);
}
}