/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkGr.h"
/* Fill out buffer with the compressed format Ganesh expects from a colortable
based bitmap. [palette (colortable) + indices].
At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
we could detect that the colortable.count is <= 16, and then repack the
indices as nibbles to save RAM, but it would take more time (i.e. a lot
slower than memcpy), so skipping that for now.
Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
as the colortable.count says it is.
*/
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());
SkAutoLockPixels apl(bitmap);
if (!bitmap.readyToDraw()) {
SkDEBUGFAIL("bitmap not ready to draw!");
return;
}
SkColorTable* ctable = bitmap.getColorTable();
char* dst = (char*)buffer;
memcpy(dst, ctable->lockColors(), ctable->count() * sizeof(SkPMColor));
ctable->unlockColors(false);
// always skip a full 256 number of entries, even if we memcpy'd fewer
dst += kGrColorTableSize;
if (bitmap.width() == bitmap.rowBytes()) {
memcpy(dst, bitmap.getPixels(), bitmap.getSize());
} else {
// need to trim off the extra bytes per row
size_t width = bitmap.width();
size_t rowBytes = bitmap.rowBytes();
const char* src = (const char*)bitmap.getPixels();
for (int y = 0; y < bitmap.height(); y++) {
memcpy(dst, src, width);
src += rowBytes;
dst += width;
}
}
}
////////////////////////////////////////////////////////////////////////////////
static void generate_bitmap_cache_id(const SkBitmap& bitmap, GrCacheID* id) {
// Our id includes the offset, width, and height so that bitmaps created by extractSubset()
// are unique.
uint32_t genID = bitmap.getGenerationID();
size_t offset = bitmap.pixelRefOffset();
int16_t width = static_cast<int16_t>(bitmap.width());
int16_t height = static_cast<int16_t>(bitmap.height());
GrCacheID::Key key;
memcpy(key.fData8, &genID, 4);
memcpy(key.fData8 + 4, &width, 2);
memcpy(key.fData8 + 6, &height, 2);
memcpy(key.fData8 + 8, &offset, sizeof(size_t));
static const size_t kKeyDataSize = 8 + sizeof(size_t);
memset(key.fData8 + kKeyDataSize, 0, sizeof(key) - kKeyDataSize);
GR_STATIC_ASSERT(sizeof(key) >= 8 + sizeof(size_t));
static const GrCacheID::Domain gBitmapTextureDomain = GrCacheID::GenerateDomain();
id->reset(gBitmapTextureDomain, key);
}
static void generate_bitmap_texture_desc(const SkBitmap& bitmap, GrTextureDesc* desc) {
desc->fFlags = kNone_GrTextureFlags;
desc->fWidth = bitmap.width();
desc->fHeight = bitmap.height();
desc->fConfig = SkBitmapConfig2GrPixelConfig(bitmap.config());
desc->fSampleCnt = 0;
}
static GrTexture* sk_gr_create_bitmap_texture(GrContext* ctx,
bool cache,
const GrTextureParams* params,
const SkBitmap& origBitmap) {
SkAutoLockPixels alp(origBitmap);
if (!origBitmap.readyToDraw()) {
return NULL;
}
SkBitmap tmpBitmap;
const SkBitmap* bitmap = &origBitmap;
GrTextureDesc desc;
generate_bitmap_texture_desc(*bitmap, &desc);
if (SkBitmap::kIndex8_Config == bitmap->config()) {
// build_compressed_data doesn't do npot->pot expansion
// and paletted textures can't be sub-updated
if (ctx->supportsIndex8PixelConfig(params,
bitmap->width(), bitmap->height())) {
size_t imagesize = bitmap->width() * bitmap->height() +
kGrColorTableSize;
SkAutoMalloc storage(imagesize);
build_compressed_data(storage.get(), origBitmap);
// our compressed data will be trimmed, so pass width() for its
// "rowBytes", since they are the same now.
if (cache) {
GrCacheID cacheID;
generate_bitmap_cache_id(origBitmap, &cacheID);
return ctx->createTexture(params, desc, cacheID, storage.get(), bitmap->width());
} else {
GrTexture* result = ctx->lockAndRefScratchTexture(desc,
GrContext::kExact_ScratchTexMatch);
result->writePixels(0, 0, bitmap->width(),
bitmap->height(), desc.fConfig,
storage.get());
return result;
}
} else {
origBitmap.copyTo(&tmpBitmap, SkBitmap::kARGB_8888_Config);
// now bitmap points to our temp, which has been promoted to 32bits
bitmap = &tmpBitmap;
desc.fConfig = SkBitmapConfig2GrPixelConfig(bitmap->config());
}
}
if (cache) {
// This texture is likely to be used again so leave it in the cache
GrCacheID cacheID;
generate_bitmap_cache_id(origBitmap, &cacheID);
return ctx->createTexture(params, desc, cacheID, bitmap->getPixels(), bitmap->rowBytes());
} else {
// This texture is unlikely to be used again (in its present form) so
// just use a scratch texture. This will remove the texture from the
// cache so no one else can find it. Additionally, once unlocked, the
// scratch texture will go to the end of the list for purging so will
// likely be available for this volatile bitmap the next time around.
GrTexture* result = ctx->lockAndRefScratchTexture(desc, GrContext::kExact_ScratchTexMatch);
result->writePixels(0, 0,
bitmap->width(), bitmap->height(),
desc.fConfig,
bitmap->getPixels(),
bitmap->rowBytes());
return result;
}
}
bool GrIsBitmapInCache(const GrContext* ctx,
const SkBitmap& bitmap,
const GrTextureParams* params) {
GrCacheID cacheID;
generate_bitmap_cache_id(bitmap, &cacheID);
GrTextureDesc desc;
generate_bitmap_texture_desc(bitmap, &desc);
return ctx->isTextureInCache(desc, cacheID, params);
}
GrTexture* GrLockAndRefCachedBitmapTexture(GrContext* ctx,
const SkBitmap& bitmap,
const GrTextureParams* params) {
GrTexture* result = NULL;
bool cache = !bitmap.isVolatile();
if (cache) {
// If the bitmap isn't changing try to find a cached copy first.
GrCacheID cacheID;
generate_bitmap_cache_id(bitmap, &cacheID);
GrTextureDesc desc;
generate_bitmap_texture_desc(bitmap, &desc);
result = ctx->findAndRefTexture(desc, cacheID, params);
}
if (NULL == result) {
result = sk_gr_create_bitmap_texture(ctx, cache, params, bitmap);
}
if (NULL == result) {
GrPrintf("---- failed to create texture for cache [%d %d]\n",
bitmap.width(), bitmap.height());
}
return result;
}
void GrUnlockAndUnrefCachedBitmapTexture(GrTexture* texture) {
GrAssert(NULL != texture->getContext());
texture->getContext()->unlockScratchTexture(texture);
texture->unref();
}
///////////////////////////////////////////////////////////////////////////////
GrPixelConfig SkBitmapConfig2GrPixelConfig(SkBitmap::Config config) {
switch (config) {
case SkBitmap::kA8_Config:
return kAlpha_8_GrPixelConfig;
case SkBitmap::kIndex8_Config:
return kIndex_8_GrPixelConfig;
case SkBitmap::kRGB_565_Config:
return kRGB_565_GrPixelConfig;
case SkBitmap::kARGB_4444_Config:
return kRGBA_4444_GrPixelConfig;
case SkBitmap::kARGB_8888_Config:
return kSkia8888_PM_GrPixelConfig;
default:
// kNo_Config, kA1_Config missing, and kRLE_Index8_Config
return kUnknown_GrPixelConfig;
}
}