blob: 863cc11b1d8f189368c10524fed583bda0014be7 [file] [log] [blame]
/*
* 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 "SkBitmap.h"
#include "SkBitmapCache.h"
#include "SkImageCacherator.h"
#include "SkMallocPixelRef.h"
#include "SkNextID.h"
#include "SkPixelRef.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrGpuResourcePriv.h"
#include "GrResourceKey.h"
#include "GrTextureAccess.h"
#include "SkGr.h"
#include "SkGrPriv.h"
#endif
SkImageCacherator* SkImageCacherator::NewFromGenerator(SkImageGenerator* gen,
const SkIRect* subset) {
if (!gen) {
return nullptr;
}
const SkImageInfo& info = gen->getInfo();
if (info.isEmpty()) {
return nullptr;
}
uint32_t uniqueID = gen->uniqueID();
const SkIRect bounds = SkIRect::MakeWH(info.width(), info.height());
if (subset) {
if (!bounds.contains(*subset)) {
return nullptr;
}
if (*subset != bounds) {
// we need a different uniqueID since we really are a subset of the raw generator
uniqueID = SkNextID::ImageID();
}
} else {
subset = &bounds;
}
return SkNEW_ARGS(SkImageCacherator, (gen,
gen->getInfo().makeWH(subset->width(), subset->height()),
SkIPoint::Make(subset->x(), subset->y()),
uniqueID));
}
SkImageCacherator::SkImageCacherator(SkImageGenerator* gen, const SkImageInfo& info,
const SkIPoint& origin, uint32_t uniqueID)
: fGenerator(gen)
, fInfo(info)
, fOrigin(origin)
, fUniqueID(uniqueID)
{}
SkImageCacherator::~SkImageCacherator() {
SkDELETE(fGenerator);
}
static bool check_output_bitmap(const SkBitmap& bitmap, uint32_t expectedID) {
SkASSERT(bitmap.getGenerationID() == expectedID);
SkASSERT(bitmap.isImmutable());
SkASSERT(bitmap.getPixels());
return true;
}
static bool generate_bitmap(SkBitmap* bitmap, const SkImageInfo& info, const SkIPoint& origin,
SkImageGenerator* generator) {
const size_t rowBytes = info.minRowBytes();
if (!bitmap->tryAllocPixels(info, rowBytes)) {
return false;
}
SkASSERT(bitmap->rowBytes() == rowBytes);
const SkImageInfo& genInfo = generator->getInfo();
if (info.dimensions() == genInfo.dimensions()) {
SkASSERT(origin.x() == 0 && origin.y() == 0);
// fast-case, no copy needed
if (!generator->getPixels(bitmap->info(), bitmap->getPixels(), rowBytes)) {
bitmap->reset();
return false;
}
} else {
// need to handle subsetting
SkBitmap full;
if (!full.tryAllocPixels(genInfo)) {
return false;
}
if (!generator->getPixels(full.info(), full.getPixels(), full.rowBytes())) {
bitmap->reset();
return false;
}
full.readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(),
origin.x(), origin.y());
}
return true;
}
//////////////////////////////////////////////////////////////////////////////////////////////////
bool SkImageCacherator::tryLockAsBitmap(SkBitmap* bitmap) {
if (SkBitmapCache::Find(fUniqueID, bitmap)) {
return check_output_bitmap(*bitmap, fUniqueID);
}
if (!generate_bitmap(bitmap, fInfo, fOrigin, fGenerator)) {
return false;
}
bitmap->pixelRef()->setImmutableWithID(fUniqueID);
SkBitmapCache::Add(fUniqueID, *bitmap);
return true;
}
bool SkImageCacherator::lockAsBitmap(SkBitmap* bitmap) {
if (this->tryLockAsBitmap(bitmap)) {
return check_output_bitmap(*bitmap, fUniqueID);
}
#if SK_SUPPORT_GPU
// Try to get a texture and read it back to raster (and then cache that with our ID)
SkIRect subset = SkIRect::MakeXYWH(fOrigin.x(), fOrigin.y(), fInfo.width(), fInfo.height());
SkAutoTUnref<GrTexture> tex(fGenerator->generateTexture(nullptr, kUntiled_SkImageUsageType,
&subset));
if (!tex) {
bitmap->reset();
return false;
}
if (!bitmap->tryAllocPixels(fInfo)) {
bitmap->reset();
return false;
}
const uint32_t pixelOpsFlags = 0;
if (!tex->readPixels(0, 0, bitmap->width(), bitmap->height(), SkImageInfo2GrPixelConfig(fInfo),
bitmap->getPixels(), bitmap->rowBytes(), pixelOpsFlags)) {
bitmap->reset();
return false;
}
bitmap->pixelRef()->setImmutableWithID(fUniqueID);
SkBitmapCache::Add(fUniqueID, *bitmap);
return check_output_bitmap(*bitmap, fUniqueID);
#else
return false;
#endif
}
//////////////////////////////////////////////////////////////////////////////////////////////////
GrTexture* SkImageCacherator::tryLockAsTexture(GrContext* ctx, SkImageUsageType usage) {
#if SK_SUPPORT_GPU
GrUniqueKey key;
GrMakeKeyFromImageID(&key, fUniqueID, fInfo.width(), fInfo.height(), SkIPoint::Make(0, 0),
*ctx->caps(), usage);
GrTexture* tex = ctx->textureProvider()->findAndRefTextureByUniqueKey(key);
if (tex) {
return tex; // we got a cache hit!
}
SkIRect subset = SkIRect::MakeXYWH(fOrigin.x(), fOrigin.y(), fInfo.width(), fInfo.height());
tex = fGenerator->generateTexture(ctx, usage, &subset);
if (tex) {
tex->resourcePriv().setUniqueKey(key);
}
return tex;
#else
return nullptr;
#endif
}
GrTexture* SkImageCacherator::lockAsTexture(GrContext* ctx, SkImageUsageType usage) {
#if SK_SUPPORT_GPU
if (!ctx) {
return nullptr;
}
if (GrTexture* tex = this->tryLockAsTexture(ctx, usage)) {
return tex;
}
// Try to get a bitmap and then upload/cache it as a texture
SkBitmap bitmap;
if (!generate_bitmap(&bitmap, fInfo, fOrigin, fGenerator)) {
return nullptr;
}
return GrRefCachedBitmapTexture(ctx, bitmap, usage);
#else
return nullptr;
#endif
}