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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()) {
SkASSERT(!"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;
}
}
}
////////////////////////////////////////////////////////////////////////////////
GrContext::TextureCacheEntry sk_gr_create_bitmap_texture(GrContext* ctx,
GrContext::TextureKey key,
const GrSamplerState& sampler,
const SkBitmap& origBitmap) {
SkAutoLockPixels alp(origBitmap);
GrContext::TextureCacheEntry entry;
if (!origBitmap.readyToDraw()) {
return entry;
}
SkBitmap tmpBitmap;
const SkBitmap* bitmap = &origBitmap;
GrTextureDesc desc = {
kNone_GrTextureFlags,
kNone_GrAALevel,
bitmap->width(),
bitmap->height(),
SkGr::Bitmap2PixelConfig(*bitmap)
};
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(sampler,
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 (gUNCACHED_KEY != key) {
return ctx->createAndLockTexture(key, sampler, desc, storage.get(),
bitmap->width());
} else {
entry = ctx->lockScratchTexture(desc,
GrContext::kExact_ScratchTexMatch);
entry.texture()->writePixels(0, 0, bitmap->width(),
bitmap->height(), desc.fConfig,
storage.get(), 0);
return entry;
}
} else {
origBitmap.copyTo(&tmpBitmap, SkBitmap::kARGB_8888_Config);
// now bitmap points to our temp, which has been promoted to 32bits
bitmap = &tmpBitmap;
}
}
desc.fConfig = SkGr::Bitmap2PixelConfig(*bitmap);
if (gUNCACHED_KEY != key) {
return ctx->createAndLockTexture(key, sampler, desc,
bitmap->getPixels(),
bitmap->rowBytes());
} else {
entry = ctx->lockScratchTexture(desc,
GrContext::kExact_ScratchTexMatch);
entry.texture()->writePixels(0, 0,
bitmap->width(), bitmap->height(),
desc.fConfig,
bitmap->getPixels(),
bitmap->rowBytes());
return entry;
}
}
///////////////////////////////////////////////////////////////////////////////
void SkGrClipIterator::reset(const SkClipStack& clipStack) {
fClipStack = &clipStack;
fIter.reset(clipStack);
// Gr has no notion of replace, skip to the
// last replace in the clip stack.
int lastReplace = 0;
int curr = 0;
while (NULL != (fCurr = fIter.next())) {
if (SkRegion::kReplace_Op == fCurr->fOp) {
lastReplace = curr;
}
++curr;
}
fIter.reset(clipStack);
for (int i = 0; i < lastReplace+1; ++i) {
fCurr = fIter.next();
}
}
GrClipType SkGrClipIterator::getType() const {
GrAssert(!this->isDone());
if (NULL == fCurr->fPath) {
return kRect_ClipType;
} else {
return kPath_ClipType;
}
}
GrSetOp SkGrClipIterator::getOp() const {
// we skipped to the last "replace" op
// when this iter was reset.
// GrClip doesn't allow replace, so treat it as
// intersect.
GrSetOp skToGrOps[] = {
kDifference_SetOp, // kDifference_Op
kIntersect_SetOp, // kIntersect_Op
kUnion_SetOp, // kUnion_Op
kXor_SetOp, // kXOR_Op
kReverseDifference_SetOp, // kReverseDifference_Op
kIntersect_SetOp // kReplace_op
};
GR_STATIC_ASSERT(0 == SkRegion::kDifference_Op);
GR_STATIC_ASSERT(1 == SkRegion::kIntersect_Op);
GR_STATIC_ASSERT(2 == SkRegion::kUnion_Op);
GR_STATIC_ASSERT(3 == SkRegion::kXOR_Op);
GR_STATIC_ASSERT(4 == SkRegion::kReverseDifference_Op);
GR_STATIC_ASSERT(5 == SkRegion::kReplace_Op);
return skToGrOps[fCurr->fOp];
}
GrPathFill SkGrClipIterator::getPathFill() const {
switch (fCurr->fPath->getFillType()) {
case SkPath::kWinding_FillType:
return kWinding_PathFill;
case SkPath::kEvenOdd_FillType:
return kEvenOdd_PathFill;
case SkPath::kInverseWinding_FillType:
return kInverseWinding_PathFill;
case SkPath::kInverseEvenOdd_FillType:
return kInverseEvenOdd_PathFill;
default:
GrCrash("Unsupported path fill in clip.");
return kWinding_PathFill; // suppress warning
}
}
///////////////////////////////////////////////////////////////////////////////
GrPixelConfig SkGr::BitmapConfig2PixelConfig(SkBitmap::Config config,
bool isOpaque) {
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:
return kUnknown_GrPixelConfig;
}
}
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