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/*
* 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 GrTexture* sk_gr_create_bitmap_texture(GrContext* ctx,
uint64_t key,
const GrTextureParams* params,
const SkBitmap& origBitmap) {
SkAutoLockPixels alp(origBitmap);
if (!origBitmap.readyToDraw()) {
return NULL;
}
SkBitmap tmpBitmap;
const SkBitmap* bitmap = &origBitmap;
GrTextureDesc desc;
desc.fWidth = bitmap->width();
desc.fHeight = bitmap->height();
desc.fConfig = SkBitmapConfig2GrPixelConfig(bitmap->config());
GrCacheData cacheData(key);
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 (GrCacheData::kScratch_CacheID != key) {
return ctx->createTexture(params, desc, cacheData,
storage.get(),
bitmap->width());
} else {
GrTexture* result = ctx->lockScratchTexture(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 (GrCacheData::kScratch_CacheID != key) {
// This texture is likely to be used again so leave it in the cache
// but locked.
return ctx->createTexture(params, desc, cacheData,
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->lockScratchTexture(desc,
GrContext::kExact_ScratchTexMatch);
result->writePixels(0, 0,
bitmap->width(), bitmap->height(),
desc.fConfig,
bitmap->getPixels(),
bitmap->rowBytes());
return result;
}
}
///////////////////////////////////////////////////////////////////////////////
GrTexture* GrLockCachedBitmapTexture(GrContext* ctx,
const SkBitmap& bitmap,
const GrTextureParams* params) {
GrTexture* result = NULL;
if (!bitmap.isVolatile()) {
// If the bitmap isn't changing try to find a cached copy first
uint64_t key = bitmap.getGenerationID();
key |= ((uint64_t) bitmap.pixelRefOffset()) << 32;
GrTextureDesc desc;
desc.fWidth = bitmap.width();
desc.fHeight = bitmap.height();
desc.fConfig = SkBitmapConfig2GrPixelConfig(bitmap.config());
GrCacheData cacheData(key);
result = ctx->findTexture(desc, cacheData, params);
if (NULL == result) {
// didn't find a cached copy so create one
result = sk_gr_create_bitmap_texture(ctx, key, params, bitmap);
}
} else {
result = sk_gr_create_bitmap_texture(ctx, GrCacheData::kScratch_CacheID, params, bitmap);
}
if (NULL == result) {
GrPrintf("---- failed to create texture for cache [%d %d]\n",
bitmap.width(), bitmap.height());
}
return result;
}
void GrUnlockCachedBitmapTexture(GrTexture* texture) {
GrAssert(NULL != texture->getContext());
texture->getContext()->unlockScratchTexture(texture);
}
///////////////////////////////////////////////////////////////////////////////
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;
}
}
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