bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height, size_t rowBytes,
GrPixelConfig srcConfig, DrawPreference* drawPreference,
WritePixelTempDrawInfo* tempDrawInfo) {
SkASSERT(drawPreference);
SkASSERT(tempDrawInfo);
SkASSERT(kGpuPrefersDraw_DrawPreference != *drawPreference);
if (GrPixelConfigIsCompressed(dstSurface->desc().fConfig) &&
dstSurface->desc().fConfig != srcConfig) {
return false;
}
if (this->caps()->useDrawInsteadOfPartialRenderTargetWrite() &&
SkToBool(dstSurface->asRenderTarget()) &&
(width < dstSurface->width() || height < dstSurface->height())) {
ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
}
if (!this->onGetWritePixelsInfo(dstSurface, width, height, rowBytes, srcConfig, drawPreference,
tempDrawInfo)) {
return false;
}
// Check to see if we're going to request that the caller draw when drawing is not possible.
if (!dstSurface->asRenderTarget() ||
!this->caps()->isConfigTexturable(tempDrawInfo->fTempSurfaceDesc.fConfig)) {
// If we don't have a fallback to a straight upload then fail.
if (kRequireDraw_DrawPreference == *drawPreference ||
!this->caps()->isConfigTexturable(srcConfig)) {
return false;
}
*drawPreference = kNoDraw_DrawPreference;
}
return true;
}
bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, GrSurfaceOrigin dstOrigin, int width,
int height, GrColorType srcColorType,
GrSRGBConversion srgbConversion, DrawPreference* drawPreference,
WritePixelTempDrawInfo* tempDrawInfo) {
SkASSERT(drawPreference);
SkASSERT(tempDrawInfo);
SkASSERT(dstSurface);
SkASSERT(kGpuPrefersDraw_DrawPreference != *drawPreference);
GrPixelConfig tempSurfaceConfig = kUnknown_GrPixelConfig;
// GrGpu::writePixels doesn't do any sRGB conversions, so we must draw if there is one.
switch (srgbConversion) {
case GrSRGBConversion::kNone:
// We support writing just A to a RGBA. In that case there is no sRGB version of the
// src format but we still want to succeed.
if (GrColorTypeIsAlphaOnly(srcColorType)) {
tempSurfaceConfig = GrColorTypeToPixelConfig(srcColorType, GrSRGBEncoded::kNo);
} else {
tempSurfaceConfig = GrColorTypeToPixelConfig(
srcColorType, GrPixelConfigIsSRGBEncoded(dstSurface->config()));
}
break;
case GrSRGBConversion::kLinearToSRGB:
SkASSERT(this->caps()->srgbSupport());
// This assert goes away when we start referring to CPU data using color type.
tempSurfaceConfig = GrColorTypeToPixelConfig(srcColorType, GrSRGBEncoded::kNo);
// We don't currently support storing sRGB encoded data in a surface unless it is
// an SRGB-encoded config. That is likely to change when we need to store sRGB encoded
// data in 101010102 and F16 textures. We'll have to provoke the caller to do the
// conversion in a shader.
if (!GrPixelConfigIsSRGB(dstSurface->config())) {
return false;
}
ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
break;
case GrSRGBConversion::kSRGBToLinear:
SkASSERT(this->caps()->srgbSupport());
tempSurfaceConfig = GrColorTypeToPixelConfig(srcColorType, GrSRGBEncoded::kYes);
// Currently we don't expect to make a SRGB encoded surface and then succeed at
// treating it as though it were linear and then convert to sRGB.
if (GrSRGBEncoded::kYes == GrPixelConfigIsSRGBEncoded(dstSurface->config())) {
return false;
}
ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
break;
}
if (kUnknown_GrPixelConfig == tempSurfaceConfig) {
return false;
}
// Default values for intermediate draws. The intermediate texture config matches the dst's
// config, is approx sized to the write rect, no swizzling or sppofing of the src config.
tempDrawInfo->fTempSurfaceDesc.fFlags = kNone_GrSurfaceFlags;
tempDrawInfo->fTempSurfaceDesc.fConfig = tempSurfaceConfig;
tempDrawInfo->fTempSurfaceDesc.fWidth = width;
tempDrawInfo->fTempSurfaceDesc.fHeight = height;
tempDrawInfo->fTempSurfaceDesc.fSampleCnt = 1;
tempDrawInfo->fSwizzle = GrSwizzle::RGBA();
tempDrawInfo->fWriteColorType = srcColorType;
if (!this->onGetWritePixelsInfo(dstSurface, dstOrigin, width, height, srcColorType,
drawPreference, tempDrawInfo)) {
return false;
}
// Check to see if we're going to request that the caller draw when drawing is not possible.
if (!dstSurface->asRenderTarget() ||
!this->caps()->isConfigTexturable(tempDrawInfo->fTempSurfaceDesc.fConfig)) {
// If we don't have a fallback to a straight upload then fail.
if (kRequireDraw_DrawPreference == *drawPreference /*TODO ||
!this->caps()->isConfigTexturable(srcConfig)*/) {
return false;
}
*drawPreference = kNoDraw_DrawPreference;
}
return true;
}
bool GrGpu::getReadPixelsInfo(GrSurface* srcSurface, GrSurfaceOrigin srcOrigin, int width,
int height, size_t rowBytes, GrColorType dstColorType,
GrSRGBConversion srgbConversion, DrawPreference* drawPreference,
ReadPixelTempDrawInfo* tempDrawInfo) {
SkASSERT(drawPreference);
SkASSERT(tempDrawInfo);
SkASSERT(srcSurface);
SkASSERT(kGpuPrefersDraw_DrawPreference != *drawPreference);
// We currently do not support reading into the packed formats 565 or 4444 as they are not
// required to have read back support on all devices and backends.
if (GrColorType::kRGB_565 == dstColorType || GrColorType::kABGR_4444 == dstColorType) {
return false;
}
GrPixelConfig tempSurfaceConfig = kUnknown_GrPixelConfig;
// GrGpu::readPixels doesn't do any sRGB conversions, so we must draw if there is one.
switch (srgbConversion) {
case GrSRGBConversion::kNone:
// We support reading from RGBA to just A. In that case there is no sRGB version of the
// dst format but we still want to succeed.
if (GrColorTypeIsAlphaOnly(dstColorType)) {
tempSurfaceConfig = GrColorTypeToPixelConfig(dstColorType, GrSRGBEncoded::kNo);
} else {
tempSurfaceConfig = GrColorTypeToPixelConfig(
dstColorType, GrPixelConfigIsSRGBEncoded(srcSurface->config()));
}
break;
case GrSRGBConversion::kLinearToSRGB:
SkASSERT(this->caps()->srgbSupport());
tempSurfaceConfig = GrColorTypeToPixelConfig(dstColorType, GrSRGBEncoded::kYes);
// Currently we don't expect to make a SRGB encoded surface and then read data from it
// such that we treat it as though it were linear and is then converted to sRGB.
if (GrPixelConfigIsSRGB(srcSurface->config())) {
return false;
}
ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
break;
case GrSRGBConversion::kSRGBToLinear:
SkASSERT(this->caps()->srgbSupport());
tempSurfaceConfig = GrColorTypeToPixelConfig(dstColorType, GrSRGBEncoded::kNo);
// We don't currently support reading sRGB encoded data into linear from a surface
// unless it is an sRGB-encoded config. That is likely to change when we need to store
// sRGB encoded data in 101010102 and F16 textures. We'll have to provoke the caller to
// do the conversion in a shader.
if (GrSRGBEncoded::kNo == GrPixelConfigIsSRGBEncoded(srcSurface->config())) {
return false;
}
ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
break;
}
if (kUnknown_GrPixelConfig == tempSurfaceConfig) {
return false;
}
// Default values for intermediate draws. The intermediate texture config matches the dst's
// config, is approx sized to the read rect, no swizzling or spoofing of the dst config.
tempDrawInfo->fTempSurfaceDesc.fFlags = kRenderTarget_GrSurfaceFlag;
tempDrawInfo->fTempSurfaceDesc.fWidth = width;
tempDrawInfo->fTempSurfaceDesc.fHeight = height;
tempDrawInfo->fTempSurfaceDesc.fSampleCnt = 1;
tempDrawInfo->fTempSurfaceDesc.fConfig = tempSurfaceConfig;
tempDrawInfo->fTempSurfaceFit = SkBackingFit::kApprox;
tempDrawInfo->fSwizzle = GrSwizzle::RGBA();
tempDrawInfo->fReadColorType = dstColorType;
if (!this->onGetReadPixelsInfo(srcSurface, srcOrigin, width, height, rowBytes, dstColorType,
drawPreference, tempDrawInfo)) {
return false;
}
// Check to see if we're going to request that the caller draw when drawing is not possible.
if (!srcSurface->asTexture() ||
!this->caps()->isConfigRenderable(tempDrawInfo->fTempSurfaceDesc.fConfig)) {
// If we don't have a fallback to a straight read then fail.
if (kRequireDraw_DrawPreference == *drawPreference) {
return false;
}
*drawPreference = kNoDraw_DrawPreference;
}
return true;
}