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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorPriv.h"
#include "SkConfig8888.h"
#include "SkMask.h"
#include "SkPixmap.h"
#include "SkUtils.h"
void SkAutoPixmapUnlock::reset(const SkPixmap& pm, void (*unlock)(void*), void* ctx) {
SkASSERT(pm.addr() != nullptr);
this->unlock();
fPixmap = pm;
fUnlockProc = unlock;
fUnlockContext = ctx;
fIsLocked = true;
}
/////////////////////////////////////////////////////////////////////////////////////////////////
void SkPixmap::reset() {
fPixels = nullptr;
fCTable = nullptr;
fRowBytes = 0;
fInfo = SkImageInfo::MakeUnknown();
}
void SkPixmap::reset(const SkImageInfo& info, const void* addr, size_t rowBytes, SkColorTable* ct) {
if (addr) {
SkASSERT(info.validRowBytes(rowBytes));
}
fPixels = addr;
fCTable = ct;
fRowBytes = rowBytes;
fInfo = info;
}
bool SkPixmap::reset(const SkMask& src) {
if (SkMask::kA8_Format == src.fFormat) {
this->reset(SkImageInfo::MakeA8(src.fBounds.width(), src.fBounds.height()),
src.fImage, src.fRowBytes, nullptr);
return true;
}
this->reset();
return false;
}
bool SkPixmap::extractSubset(SkPixmap* result, const SkIRect& subset) const {
SkIRect srcRect, r;
srcRect.set(0, 0, 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()));
const void* pixels = nullptr;
if (fPixels) {
const size_t bpp = fInfo.bytesPerPixel();
pixels = (const uint8_t*)fPixels + r.fTop * fRowBytes + r.fLeft * bpp;
}
result->reset(fInfo.makeWH(r.width(), r.height()), pixels, fRowBytes, fCTable);
return true;
}
bool SkPixmap::readPixels(const SkImageInfo& requestedDstInfo, void* dstPixels, size_t dstRB,
int x, int y) const {
if (kUnknown_SkColorType == requestedDstInfo.colorType()) {
return false;
}
if (nullptr == dstPixels || dstRB < requestedDstInfo.minRowBytes()) {
return false;
}
if (0 == requestedDstInfo.width() || 0 == requestedDstInfo.height()) {
return false;
}
SkIRect srcR = SkIRect::MakeXYWH(x, y, requestedDstInfo.width(), requestedDstInfo.height());
if (!srcR.intersect(0, 0, this->width(), this->height())) {
return false;
}
// the intersect may have shrunk info's logical size
const SkImageInfo dstInfo = requestedDstInfo.makeWH(srcR.width(), srcR.height());
// if x or y are negative, then we have to adjust pixels
if (x > 0) {
x = 0;
}
if (y > 0) {
y = 0;
}
// here x,y are either 0 or negative
dstPixels = ((char*)dstPixels - y * dstRB - x * dstInfo.bytesPerPixel());
const SkImageInfo srcInfo = this->info().makeWH(dstInfo.width(), dstInfo.height());
const void* srcPixels = this->addr(srcR.x(), srcR.y());
return SkPixelInfo::CopyPixels(dstInfo, dstPixels, dstRB,
srcInfo, srcPixels, this->rowBytes(), this->ctable());
}
static uint16_t pack_8888_to_4444(unsigned a, unsigned r, unsigned g, unsigned b) {
unsigned pixel = (SkA32To4444(a) << SK_A4444_SHIFT) |
(SkR32To4444(r) << SK_R4444_SHIFT) |
(SkG32To4444(g) << SK_G4444_SHIFT) |
(SkB32To4444(b) << SK_B4444_SHIFT);
return SkToU16(pixel);
}
bool SkPixmap::erase(SkColor color, const SkIRect& inArea) const {
if (nullptr == fPixels) {
return false;
}
SkIRect area;
if (!area.intersect(this->bounds(), inArea)) {
return false;
}
U8CPU a = SkColorGetA(color);
U8CPU r = SkColorGetR(color);
U8CPU g = SkColorGetG(color);
U8CPU b = SkColorGetB(color);
int height = area.height();
const int width = area.width();
const int rowBytes = this->rowBytes();
switch (this->colorType()) {
case kGray_8_SkColorType: {
if (255 != a) {
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
}
int gray = SkComputeLuminance(r, g, b);
uint8_t* p = this->writable_addr8(area.fLeft, area.fTop);
while (--height >= 0) {
memset(p, gray, width);
p += rowBytes;
}
break;
}
case kAlpha_8_SkColorType: {
uint8_t* p = this->writable_addr8(area.fLeft, area.fTop);
while (--height >= 0) {
memset(p, a, width);
p += rowBytes;
}
break;
}
case kARGB_4444_SkColorType:
case kRGB_565_SkColorType: {
uint16_t* p = this->writable_addr16(area.fLeft, area.fTop);
uint16_t v;
// make rgb premultiplied
if (255 != a) {
r = SkAlphaMul(r, a);
g = SkAlphaMul(g, a);
b = SkAlphaMul(b, a);
}
if (kARGB_4444_SkColorType == this->colorType()) {
v = pack_8888_to_4444(a, r, g, b);
} else {
v = SkPackRGB16(r >> (8 - SK_R16_BITS),
g >> (8 - SK_G16_BITS),
b >> (8 - SK_B16_BITS));
}
while (--height >= 0) {
sk_memset16(p, v, width);
p = (uint16_t*)((char*)p + rowBytes);
}
break;
}
case kBGRA_8888_SkColorType:
case kRGBA_8888_SkColorType: {
uint32_t* p = this->writable_addr32(area.fLeft, area.fTop);
if (255 != a && kPremul_SkAlphaType == this->alphaType()) {
r = SkAlphaMul(r, a);
g = SkAlphaMul(g, a);
b = SkAlphaMul(b, a);
}
uint32_t v = kRGBA_8888_SkColorType == this->colorType() ?
SkPackARGB_as_RGBA(a, r, g, b) : SkPackARGB_as_BGRA(a, r, g, b);
while (--height >= 0) {
sk_memset32(p, v, width);
p = (uint32_t*)((char*)p + rowBytes);
}
break;
}
default:
return false; // no change, so don't call notifyPixelsChanged()
}
return true;
}
//////////////////////////////////////////////////////////////////////////////////////////////////
SkAutoPixmapStorage::SkAutoPixmapStorage() : fStorage(nullptr) {}
SkAutoPixmapStorage::~SkAutoPixmapStorage() {
this->freeStorage();
}
bool SkAutoPixmapStorage::tryAlloc(const SkImageInfo& info) {
this->freeStorage();
size_t rb = info.minRowBytes();
size_t size = info.getSafeSize(rb);
if (0 == size) {
return false;
}
void* pixels = sk_malloc_flags(size, 0);
if (nullptr == pixels) {
return false;
}
this->reset(info, pixels, rb);
fStorage = pixels;
return true;
}
void SkAutoPixmapStorage::alloc(const SkImageInfo& info) {
if (!this->tryAlloc(info)) {
sk_throw();
}
}
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