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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrTextureParamsAdjuster.h"
#include "GrCaps.h"
#include "GrContext.h"
#include "GrDrawContext.h"
#include "GrGpu.h"
#include "GrTexture.h"
#include "GrTextureParams.h"
#include "GrTextureProvider.h"
#include "SkCanvas.h"
#include "SkGr.h"
#include "SkGrPriv.h"
typedef GrTextureParamsAdjuster::CopyParams CopyParams;
static GrTexture* copy_on_gpu(GrTexture* inputTexture, const CopyParams& copyParams) {
GrContext* context = inputTexture->getContext();
SkASSERT(context);
const GrCaps* caps = context->caps();
// Either it's a cache miss or the original wasn't cached to begin with.
GrSurfaceDesc rtDesc = inputTexture->desc();
rtDesc.fFlags = rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
rtDesc.fWidth = copyParams.fWidth;
rtDesc.fHeight = copyParams.fHeight;
rtDesc.fConfig = GrMakePixelConfigUncompressed(rtDesc.fConfig);
// If the config isn't renderable try converting to either A8 or an 32 bit config. Otherwise,
// fail.
if (!caps->isConfigRenderable(rtDesc.fConfig, false)) {
if (GrPixelConfigIsAlphaOnly(rtDesc.fConfig)) {
if (caps->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
rtDesc.fConfig = kAlpha_8_GrPixelConfig;
} else if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
rtDesc.fConfig = kSkia8888_GrPixelConfig;
} else {
return nullptr;
}
} else if (kRGB_GrColorComponentFlags ==
(kRGB_GrColorComponentFlags & GrPixelConfigComponentMask(rtDesc.fConfig))) {
if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
rtDesc.fConfig = kSkia8888_GrPixelConfig;
} else {
return nullptr;
}
} else {
return nullptr;
}
}
SkAutoTUnref<GrTexture> copy(context->textureProvider()->createTexture(rtDesc, true));
if (!copy) {
return nullptr;
}
GrPaint paint;
// If filtering is not desired then we want to ensure all texels in the resampled image are
// copies of texels from the original.
GrTextureParams params(SkShader::kClamp_TileMode, copyParams.fFilter);
paint.addColorTextureProcessor(inputTexture, SkMatrix::I(), params);
SkRect rect = SkRect::MakeWH(SkIntToScalar(rtDesc.fWidth), SkIntToScalar(rtDesc.fHeight));
SkRect localRect = SkRect::MakeWH(1.f, 1.f);
SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(copy->asRenderTarget()));
if (!drawContext) {
return nullptr;
}
drawContext->drawNonAARectToRect(GrClip::WideOpen(), paint, SkMatrix::I(), rect, localRect);
return copy.detach();
}
static SkBitmap copy_on_cpu(const SkBitmap& bmp, const CopyParams& copyParams) {
SkBitmap stretched;
stretched.allocN32Pixels(copyParams.fWidth, copyParams.fHeight);
SkCanvas canvas(stretched);
SkPaint paint;
switch (copyParams.fFilter) {
case GrTextureParams::kNone_FilterMode:
paint.setFilterQuality(kNone_SkFilterQuality);
break;
case GrTextureParams::kBilerp_FilterMode:
paint.setFilterQuality(kLow_SkFilterQuality);
break;
case GrTextureParams::kMipMap_FilterMode:
paint.setFilterQuality(kMedium_SkFilterQuality);
break;
}
SkRect dstRect = SkRect::MakeWH(SkIntToScalar(copyParams.fWidth),
SkIntToScalar(copyParams.fHeight));
canvas.drawBitmapRect(bmp, dstRect, &paint);
return stretched;
}
GrTexture* GrTextureParamsAdjuster::refTextureForParams(GrContext* ctx,
const GrTextureParams& params) {
CopyParams copyParams;
if (!ctx->getGpu()->makeCopyForTextureParams(this->width(), this->height(), params,
©Params)) {
return this->refOriginalTexture(ctx);
}
GrUniqueKey copyKey;
this->makeCopyKey(copyParams, ©Key);
if (copyKey.isValid()) {
GrTexture* result = ctx->textureProvider()->findAndRefTextureByUniqueKey(copyKey);
if (result) {
return result;
}
}
GrTexture* result = this->generateTextureForParams(ctx, copyParams);
if (!result) {
return nullptr;
}
if (copyKey.isValid()) {
ctx->textureProvider()->assignUniqueKeyToTexture(copyKey, result);
this->didCacheCopy(copyKey);
}
return result;
}
GrTexture* GrTextureParamsAdjuster::generateTextureForParams(GrContext* ctx,
const CopyParams& copyParams) {
if (this->width() < ctx->caps()->minTextureSize() ||
this->height() < ctx->caps()->minTextureSize())
{
// we can't trust our ability to use HW to perform the stretch, so we request
// a raster instead, and perform the stretch on the CPU.
SkBitmap bitmap;
if (!this->getROBitmap(&bitmap)) {
return nullptr;
}
SkBitmap stretchedBmp = copy_on_cpu(bitmap, copyParams);
return GrUploadBitmapToTexture(ctx, bitmap);
} else {
SkAutoTUnref<GrTexture> original(this->refOriginalTexture(ctx));
if (!original) {
return nullptr;
}
return copy_on_gpu(original, copyParams);
}
}
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