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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 "SkConfig8888.h"
#include "SkPixmap.h"
void SkAutoPixmapUnlock::reset(const SkPixmap& pm, void (*unlock)(void*), void* ctx) {
SkASSERT(pm.addr() != NULL);
this->unlock();
fPixmap = pm;
fUnlockProc = unlock;
fUnlockContext = ctx;
fIsLocked = true;
}
/////////////////////////////////////////////////////////////////////////////////////////////////
void SkPixmap::reset() {
fPixels = NULL;
fCTable = NULL;
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::readPixels(const SkImageInfo& requestedDstInfo, void* dstPixels, size_t dstRB,
int x, int y) const {
if (kUnknown_SkColorType == requestedDstInfo.colorType()) {
return false;
}
if (NULL == 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());
}
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