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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkFlipPixelRef.h"
#include "SkFlattenable.h"
#include "SkRegion.h"
SkFlipPixelRef::SkFlipPixelRef(SkBitmap::Config config, int width, int height)
: fFlipper(width, height) {
fConfig = config;
fSize = SkBitmap::ComputeSize(config, width, height);
fStorage = sk_malloc_throw(fSize << 1);
fPage0 = fStorage;
fPage1 = (char*)fStorage + fSize;
}
SkFlipPixelRef::~SkFlipPixelRef() {
sk_free(fStorage);
}
const SkRegion& SkFlipPixelRef::beginUpdate(SkBitmap* device) {
void* writeAddr;
const void* readAddr;
this->getFrontBack(&readAddr, &writeAddr);
device->setConfig(fConfig, fFlipper.width(), fFlipper.height());
device->setPixels(writeAddr);
SkRegion copyBits;
const SkRegion& dirty = fFlipper.update(©Bits);
SkFlipPixelRef::CopyBitsFromAddr(*device, copyBits, readAddr);
return dirty;
}
void SkFlipPixelRef::endUpdate() {
this->swapPages();
}
///////////////////////////////////////////////////////////////////////////////
void* SkFlipPixelRef::onLockPixels(SkColorTable** ct) {
fMutex.acquire();
*ct = NULL;
return fPage0;
}
void SkFlipPixelRef::onUnlockPixels() {
fMutex.release();
}
void SkFlipPixelRef::swapPages() {
fMutex.acquire();
SkTSwap<void*>(fPage0, fPage1);
this->notifyPixelsChanged();
fMutex.release();
}
void SkFlipPixelRef::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.write32(fSize);
// only need to write page0
buffer.writePad(fPage0, fSize);
}
SkFlipPixelRef::SkFlipPixelRef(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer, NULL) {
fSize = buffer.readU32();
fStorage = sk_malloc_throw(fSize << 1);
fPage0 = fStorage;
fPage1 = (char*)fStorage + fSize;
buffer.read(fPage0, fSize);
}
SK_DEFINE_FLATTENABLE_REGISTRAR(SkFlipPixelRef)
///////////////////////////////////////////////////////////////////////////////
static void copyRect(const SkBitmap& dst, const SkIRect& rect,
const void* srcAddr, int shift) {
const size_t offset = rect.fTop * dst.rowBytes() + (rect.fLeft << shift);
char* dstP = static_cast<char*>(dst.getPixels()) + offset;
const char* srcP = static_cast<const char*>(srcAddr) + offset;
const size_t rb = dst.rowBytes();
const size_t bytes = rect.width() << shift;
int height = rect.height();
while (--height >= 0) {
memcpy(dstP, srcP, bytes);
dstP += rb;
srcP += rb;
}
}
static int getShift(SkBitmap::Config config) {
switch (config) {
case SkBitmap::kARGB_8888_Config:
return 2;
case SkBitmap::kRGB_565_Config:
case SkBitmap::kARGB_4444_Config:
return 1;
case SkBitmap::kIndex8_Config:
case SkBitmap::kA8_Config:
return 0;
default:
return -1; // signal not supported
}
}
void SkFlipPixelRef::CopyBitsFromAddr(const SkBitmap& dst, const SkRegion& clip,
const void* srcAddr) {
const int shift = getShift(dst.config());
if (shift < 0) {
return;
}
const SkIRect bounds = {0, 0, dst.width(), dst.height()};
SkRegion::Cliperator iter(clip, bounds);
while (!iter.done()) {
copyRect(dst, iter.rect(), srcAddr, shift);
iter.next();
}
}
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