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/*
* Copyright 2008 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkBitmap.h"
#include "include/core/SkData.h"
#include "include/core/SkFilterQuality.h"
#include "include/core/SkMallocPixelRef.h"
#include "include/core/SkMath.h"
#include "include/core/SkPixelRef.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkUnPreMultiply.h"
#include "include/private/SkColorData.h"
#include "include/private/SkHalf.h"
#include "include/private/SkImageInfoPriv.h"
#include "include/private/SkTemplates.h"
#include "include/private/SkTo.h"
#include "src/core/SkConvertPixels.h"
#include "src/core/SkMask.h"
#include "src/core/SkMaskFilterBase.h"
#include "src/core/SkPixelRefPriv.h"
#include "src/core/SkPixmapPriv.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
#include "src/core/SkWritePixelsRec.h"
#include <cstring>
#include <utility>
static bool reset_return_false(SkBitmap* bm) {
bm->reset();
return false;
}
SkBitmap::SkBitmap() : fFlags(0) {}
SkBitmap::SkBitmap(const SkBitmap& src)
: fPixelRef (src.fPixelRef)
, fPixmap (src.fPixmap)
, fFlags (src.fFlags)
{
SkDEBUGCODE(src.validate();)
SkDEBUGCODE(this->validate();)
}
SkBitmap::SkBitmap(SkBitmap&& other)
: fPixelRef (std::move(other.fPixelRef))
, fPixmap (std::move(other.fPixmap))
, fFlags (other.fFlags)
{
SkASSERT(!other.fPixelRef);
other.fPixmap.reset();
other.fFlags = 0;
}
SkBitmap::~SkBitmap() {}
SkBitmap& SkBitmap::operator=(const SkBitmap& src) {
if (this != &src) {
fPixelRef = src.fPixelRef;
fPixmap = src.fPixmap;
fFlags = src.fFlags;
}
SkDEBUGCODE(this->validate();)
return *this;
}
SkBitmap& SkBitmap::operator=(SkBitmap&& other) {
if (this != &other) {
fPixelRef = std::move(other.fPixelRef);
fPixmap = std::move(other.fPixmap);
fFlags = other.fFlags;
SkASSERT(!other.fPixelRef);
other.fPixmap.reset();
other.fFlags = 0;
}
return *this;
}
void SkBitmap::swap(SkBitmap& other) {
using std::swap;
swap(*this, other);
SkDEBUGCODE(this->validate();)
}
void SkBitmap::reset() {
fPixelRef = nullptr; // Free pixels.
fPixmap.reset();
fFlags = 0;
}
void SkBitmap::getBounds(SkRect* bounds) const {
SkASSERT(bounds);
*bounds = SkRect::Make(this->dimensions());
}
void SkBitmap::getBounds(SkIRect* bounds) const {
SkASSERT(bounds);
*bounds = fPixmap.bounds();
}
///////////////////////////////////////////////////////////////////////////////
bool SkBitmap::setInfo(const SkImageInfo& info, size_t rowBytes) {
SkAlphaType newAT = info.alphaType();
if (!SkColorTypeValidateAlphaType(info.colorType(), info.alphaType(), &newAT)) {
return reset_return_false(this);
}
// don't look at info.alphaType(), since newAT is the real value...
// require that rowBytes fit in 31bits
int64_t mrb = info.minRowBytes64();
if (!SkTFitsIn<int32_t>(mrb)) {
return reset_return_false(this);
}
if (!SkTFitsIn<int32_t>(rowBytes)) {
return reset_return_false(this);
}
if (info.width() < 0 || info.height() < 0) {
return reset_return_false(this);
}
if (kUnknown_SkColorType == info.colorType()) {
rowBytes = 0;
} else if (0 == rowBytes) {
rowBytes = (size_t)mrb;
} else if (!info.validRowBytes(rowBytes)) {
return reset_return_false(this);
}
fPixelRef = nullptr; // Free pixels.
fPixmap.reset(info.makeAlphaType(newAT), nullptr, SkToU32(rowBytes));
SkDEBUGCODE(this->validate();)
return true;
}
bool SkBitmap::setAlphaType(SkAlphaType newAlphaType) {
if (!SkColorTypeValidateAlphaType(this->colorType(), newAlphaType, &newAlphaType)) {
return false;
}
if (this->alphaType() != newAlphaType) {
auto newInfo = fPixmap.info().makeAlphaType(newAlphaType);
fPixmap.reset(std::move(newInfo), fPixmap.addr(), fPixmap.rowBytes());
}
SkDEBUGCODE(this->validate();)
return true;
}
SkIPoint SkBitmap::pixelRefOrigin() const {
const char* addr = (const char*)fPixmap.addr();
const char* pix = (const char*)(fPixelRef ? fPixelRef->pixels() : nullptr);
size_t rb = this->rowBytes();
if (!pix || 0 == rb) {
return {0, 0};
}
SkASSERT(this->bytesPerPixel() > 0);
SkASSERT(this->bytesPerPixel() == (1 << this->shiftPerPixel()));
SkASSERT(addr >= pix);
size_t off = addr - pix;
return {SkToS32((off % rb) >> this->shiftPerPixel()), SkToS32(off / rb)};
}
void SkBitmap::setPixelRef(sk_sp<SkPixelRef> pr, int dx, int dy) {
#ifdef SK_DEBUG
if (pr) {
if (kUnknown_SkColorType != this->colorType()) {
SkASSERT(dx >= 0 && this->width() + dx <= pr->width());
SkASSERT(dy >= 0 && this->height() + dy <= pr->height());
}
}
#endif
fPixelRef = kUnknown_SkColorType != this->colorType() ? std::move(pr) : nullptr;
void* p = nullptr;
size_t rowBytes = this->rowBytes();
// ignore dx,dy if there is no pixelref
if (fPixelRef) {
rowBytes = fPixelRef->rowBytes();
// TODO(reed): Enforce that PixelRefs must have non-null pixels.
p = fPixelRef->pixels();
if (p) {
p = (char*)p + dy * rowBytes + dx * this->bytesPerPixel();
}
}
SkPixmapPriv::ResetPixmapKeepInfo(&fPixmap, p, rowBytes);
SkDEBUGCODE(this->validate();)
}
void SkBitmap::setPixels(void* p) {
if (kUnknown_SkColorType == this->colorType()) {
p = nullptr;
}
size_t rb = this->rowBytes();
SkPixmapPriv::ResetPixmapKeepInfo(&fPixmap, p, rb);
fPixelRef = p ? sk_make_sp<SkPixelRef>(this->width(), this->height(), p, rb) : nullptr;
SkDEBUGCODE(this->validate();)
}
bool SkBitmap::tryAllocPixels(Allocator* allocator) {
HeapAllocator stdalloc;
if (nullptr == allocator) {
allocator = &stdalloc;
}
return allocator->allocPixelRef(this);
}
bool SkBitmap::tryAllocN32Pixels(int width, int height, bool isOpaque) {
SkImageInfo info = SkImageInfo::MakeN32(width, height,
isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
return this->tryAllocPixels(info);
}
void SkBitmap::allocN32Pixels(int width, int height, bool isOpaque) {
SkImageInfo info = SkImageInfo::MakeN32(width, height,
isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
this->allocPixels(info);
}
void SkBitmap::allocPixels() {
this->allocPixels((Allocator*)nullptr);
}
void SkBitmap::allocPixels(Allocator* allocator) {
SkASSERT_RELEASE(this->tryAllocPixels(allocator));
}
void SkBitmap::allocPixelsFlags(const SkImageInfo& info, uint32_t flags) {
SkASSERT_RELEASE(this->tryAllocPixelsFlags(info, flags));
}
void SkBitmap::allocPixels(const SkImageInfo& info, size_t rowBytes) {
SkASSERT_RELEASE(this->tryAllocPixels(info, rowBytes));
}
void SkBitmap::allocPixels(const SkImageInfo& info) {
this->allocPixels(info, info.minRowBytes());
}
///////////////////////////////////////////////////////////////////////////////
bool SkBitmap::tryAllocPixels(const SkImageInfo& requestedInfo, size_t rowBytes) {
if (!this->setInfo(requestedInfo, rowBytes)) {
return reset_return_false(this);
}
// setInfo may have corrected info (e.g. 565 is always opaque).
const SkImageInfo& correctedInfo = this->info();
if (kUnknown_SkColorType == correctedInfo.colorType()) {
return true;
}
// setInfo may have computed a valid rowbytes if 0 were passed in
rowBytes = this->rowBytes();
sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeAllocate(correctedInfo, rowBytes);
if (!pr) {
return reset_return_false(this);
}
this->setPixelRef(std::move(pr), 0, 0);
if (nullptr == this->getPixels()) {
return reset_return_false(this);
}
SkDEBUGCODE(this->validate();)
return true;
}
bool SkBitmap::tryAllocPixelsFlags(const SkImageInfo& requestedInfo, uint32_t allocFlags) {
if (!this->setInfo(requestedInfo)) {
return reset_return_false(this);
}
// setInfo may have corrected info (e.g. 565 is always opaque).
const SkImageInfo& correctedInfo = this->info();
sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeAllocate(correctedInfo,
correctedInfo.minRowBytes());
if (!pr) {
return reset_return_false(this);
}
this->setPixelRef(std::move(pr), 0, 0);
if (nullptr == this->getPixels()) {
return reset_return_false(this);
}
SkDEBUGCODE(this->validate();)
return true;
}
static void invoke_release_proc(void (*proc)(void* pixels, void* ctx), void* pixels, void* ctx) {
if (proc) {
proc(pixels, ctx);
}
}
bool SkBitmap::installPixels(const SkImageInfo& requestedInfo, void* pixels, size_t rb,
void (*releaseProc)(void* addr, void* context), void* context) {
if (!this->setInfo(requestedInfo, rb)) {
invoke_release_proc(releaseProc, pixels, context);
this->reset();
return false;
}
if (nullptr == pixels) {
invoke_release_proc(releaseProc, pixels, context);
return true; // we behaved as if they called setInfo()
}
// setInfo may have corrected info (e.g. 565 is always opaque).
const SkImageInfo& correctedInfo = this->info();
this->setPixelRef(
SkMakePixelRefWithProc(correctedInfo.width(), correctedInfo.height(),
rb, pixels, releaseProc, context), 0, 0);
SkDEBUGCODE(this->validate();)
return true;
}
bool SkBitmap::installPixels(const SkPixmap& pixmap) {
return this->installPixels(pixmap.info(), pixmap.writable_addr(), pixmap.rowBytes(),
nullptr, nullptr);
}
bool SkBitmap::installMaskPixels(const SkMask& mask) {
if (SkMask::kA8_Format != mask.fFormat) {
this->reset();
return false;
}
return this->installPixels(SkImageInfo::MakeA8(mask.fBounds.width(),
mask.fBounds.height()),
mask.fImage, mask.fRowBytes);
}
///////////////////////////////////////////////////////////////////////////////
uint32_t SkBitmap::getGenerationID() const {
return fPixelRef ? fPixelRef->getGenerationID() : 0;
}
void SkBitmap::notifyPixelsChanged() const {
SkASSERT(!this->isImmutable());
if (fPixelRef) {
fPixelRef->notifyPixelsChanged();
}
}
///////////////////////////////////////////////////////////////////////////////
/** We explicitly use the same allocator for our pixels that SkMask does,
so that we can freely assign memory allocated by one class to the other.
*/
bool SkBitmap::HeapAllocator::allocPixelRef(SkBitmap* dst) {
const SkImageInfo info = dst->info();
if (kUnknown_SkColorType == info.colorType()) {
// SkDebugf("unsupported config for info %d\n", dst->config());
return false;
}
sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeAllocate(info, dst->rowBytes());
if (!pr) {
return false;
}
dst->setPixelRef(std::move(pr), 0, 0);
SkDEBUGCODE(dst->validate();)
return true;
}
///////////////////////////////////////////////////////////////////////////////
bool SkBitmap::isImmutable() const {
return fPixelRef ? fPixelRef->isImmutable() : false;
}
void SkBitmap::setImmutable() {
if (fPixelRef) {
fPixelRef->setImmutable();
}
}
bool SkBitmap::isVolatile() const {
return (fFlags & kImageIsVolatile_Flag) != 0;
}
void SkBitmap::setIsVolatile(bool isVolatile) {
if (isVolatile) {
fFlags |= kImageIsVolatile_Flag;
} else {
fFlags &= ~kImageIsVolatile_Flag;
}
}
void* SkBitmap::getAddr(int x, int y) const {
SkASSERT((unsigned)x < (unsigned)this->width());
SkASSERT((unsigned)y < (unsigned)this->height());
char* base = (char*)this->getPixels();
if (base) {
base += (y * this->rowBytes()) + (x << this->shiftPerPixel());
}
return base;
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
void SkBitmap::erase(SkColor c, const SkIRect& area) const {
SkDEBUGCODE(this->validate();)
if (kUnknown_SkColorType == this->colorType()) {
// TODO: can we ASSERT that we never get here?
return; // can't erase. Should we bzero so the memory is not uninitialized?
}
SkPixmap result;
if (!this->peekPixels(&result)) {
return;
}
if (result.erase(c, area)) {
this->notifyPixelsChanged();
}
}
void SkBitmap::eraseColor(SkColor c) const {
this->erase(c, SkIRect::MakeWH(this->width(), this->height()));
}
//////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////
bool SkBitmap::extractSubset(SkBitmap* result, const SkIRect& subset) const {
SkDEBUGCODE(this->validate();)
if (nullptr == result || !fPixelRef) {
return false; // no src pixels
}
SkIRect srcRect, r;
srcRect.setWH(this->width(), this->height());
if (!r.intersect(srcRect, subset)) {
return false; // r is empty (i.e. no intersection)
}
// If the upper left of the rectangle was outside the bounds of this SkBitmap, we should have
// exited above.
SkASSERT(static_cast<unsigned>(r.fLeft) < static_cast<unsigned>(this->width()));
SkASSERT(static_cast<unsigned>(r.fTop) < static_cast<unsigned>(this->height()));
SkBitmap dst;
dst.setInfo(this->info().makeDimensions(r.size()), this->rowBytes());
dst.setIsVolatile(this->isVolatile());
if (fPixelRef) {
SkIPoint origin = this->pixelRefOrigin();
// share the pixelref with a custom offset
dst.setPixelRef(fPixelRef, origin.x() + r.fLeft, origin.y() + r.fTop);
}
SkDEBUGCODE(dst.validate();)
// we know we're good, so commit to result
result->swap(dst);
return true;
}
///////////////////////////////////////////////////////////////////////////////
bool SkBitmap::readPixels(const SkImageInfo& requestedDstInfo, void* dstPixels, size_t dstRB,
int x, int y) const {
SkPixmap src;
if (!this->peekPixels(&src)) {
return false;
}
return src.readPixels(requestedDstInfo, dstPixels, dstRB, x, y);
}
bool SkBitmap::readPixels(const SkPixmap& dst, int srcX, int srcY) const {
return this->readPixels(dst.info(), dst.writable_addr(), dst.rowBytes(), srcX, srcY);
}
bool SkBitmap::writePixels(const SkPixmap& src, int dstX, int dstY) {
if (!SkImageInfoValidConversion(this->info(), src.info())) {
return false;
}
SkWritePixelsRec rec(src.info(), src.addr(), src.rowBytes(), dstX, dstY);
if (!rec.trim(this->width(), this->height())) {
return false;
}
void* dstPixels = this->getAddr(rec.fX, rec.fY);
const SkImageInfo dstInfo = this->info().makeDimensions(rec.fInfo.dimensions());
SkConvertPixels(dstInfo, dstPixels, this->rowBytes(), rec.fInfo, rec.fPixels, rec.fRowBytes);
this->notifyPixelsChanged();
return true;
}
///////////////////////////////////////////////////////////////////////////////
static bool GetBitmapAlpha(const SkBitmap& src, uint8_t* SK_RESTRICT alpha, int alphaRowBytes) {
SkASSERT(alpha != nullptr);
SkASSERT(alphaRowBytes >= src.width());
SkPixmap pmap;
if (!src.peekPixels(&pmap)) {
for (int y = 0; y < src.height(); ++y) {
memset(alpha, 0, src.width());
alpha += alphaRowBytes;
}
return false;
}
SkConvertPixels(SkImageInfo::MakeA8(pmap.width(), pmap.height()), alpha, alphaRowBytes,
pmap.info(), pmap.addr(), pmap.rowBytes());
return true;
}
#include "include/core/SkMaskFilter.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
bool SkBitmap::extractAlpha(SkBitmap* dst, const SkPaint* paint,
Allocator *allocator, SkIPoint* offset) const {
SkDEBUGCODE(this->validate();)
SkBitmap tmpBitmap;
SkMatrix identity;
SkMask srcM, dstM;
if (this->width() == 0 || this->height() == 0) {
return false;
}
srcM.fBounds.setWH(this->width(), this->height());
srcM.fRowBytes = SkAlign4(this->width());
srcM.fFormat = SkMask::kA8_Format;
SkMaskFilter* filter = paint ? paint->getMaskFilter() : nullptr;
// compute our (larger?) dst bounds if we have a filter
if (filter) {
identity.reset();
if (!as_MFB(filter)->filterMask(&dstM, srcM, identity, nullptr)) {
goto NO_FILTER_CASE;
}
dstM.fRowBytes = SkAlign4(dstM.fBounds.width());
} else {
NO_FILTER_CASE:
tmpBitmap.setInfo(SkImageInfo::MakeA8(this->width(), this->height()), srcM.fRowBytes);
if (!tmpBitmap.tryAllocPixels(allocator)) {
// Allocation of pixels for alpha bitmap failed.
SkDebugf("extractAlpha failed to allocate (%d,%d) alpha bitmap\n",
tmpBitmap.width(), tmpBitmap.height());
return false;
}
GetBitmapAlpha(*this, tmpBitmap.getAddr8(0, 0), srcM.fRowBytes);
if (offset) {
offset->set(0, 0);
}
tmpBitmap.swap(*dst);
return true;
}
srcM.fImage = SkMask::AllocImage(srcM.computeImageSize());
SkAutoMaskFreeImage srcCleanup(srcM.fImage);
GetBitmapAlpha(*this, srcM.fImage, srcM.fRowBytes);
if (!as_MFB(filter)->filterMask(&dstM, srcM, identity, nullptr)) {
goto NO_FILTER_CASE;
}
SkAutoMaskFreeImage dstCleanup(dstM.fImage);
tmpBitmap.setInfo(SkImageInfo::MakeA8(dstM.fBounds.width(), dstM.fBounds.height()),
dstM.fRowBytes);
if (!tmpBitmap.tryAllocPixels(allocator)) {
// Allocation of pixels for alpha bitmap failed.
SkDebugf("extractAlpha failed to allocate (%d,%d) alpha bitmap\n",
tmpBitmap.width(), tmpBitmap.height());
return false;
}
memcpy(tmpBitmap.getPixels(), dstM.fImage, dstM.computeImageSize());
if (offset) {
offset->set(dstM.fBounds.fLeft, dstM.fBounds.fTop);
}
SkDEBUGCODE(tmpBitmap.validate();)
tmpBitmap.swap(*dst);
return true;
}
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_DEBUG
void SkBitmap::validate() const {
this->info().validate();
SkASSERT(this->info().validRowBytes(this->rowBytes()));
uint8_t allFlags = kImageIsVolatile_Flag;
SkASSERT((~allFlags & fFlags) == 0);
if (fPixelRef && fPixelRef->pixels()) {
SkASSERT(this->getPixels());
} else {
SkASSERT(!this->getPixels());
}
if (this->getPixels()) {
SkASSERT(fPixelRef);
SkASSERT(fPixelRef->rowBytes() == this->rowBytes());
SkIPoint origin = this->pixelRefOrigin();
SkASSERT(origin.fX >= 0);
SkASSERT(origin.fY >= 0);
SkASSERT(fPixelRef->width() >= (int)this->width() + origin.fX);
SkASSERT(fPixelRef->height() >= (int)this->height() + origin.fY);
SkASSERT(fPixelRef->rowBytes() >= this->info().minRowBytes());
}
}
#endif
///////////////////////////////////////////////////////////////////////////////
bool SkBitmap::peekPixels(SkPixmap* pmap) const {
if (this->getPixels()) {
if (pmap) {
*pmap = fPixmap;
}
return true;
}
return false;
}