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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.
*/
#ifndef SkPixmapPriv_DEFINED
#define SkPixmapPriv_DEFINED
#include "SkPixmap.h"
#include "SkEncodedOrigin.h"
#include "SkAutoPixmapStorage.h"
class SkPixmapPriv {
public:
// These flag are applied in this order (swap is applied last)
enum OrientFlags {
kMirrorX = 1 << 0,
kMirrorY = 1 << 1,
kSwapXY = 1 << 2,
};
static OrientFlags OriginToOrient(SkEncodedOrigin);
/**
* Copy the pixels in this pixmap into dst, applying the orientation transformations specified
* by the flags. If the inputs are invalid, this returns false and no copy is made.
*/
static bool Orient(const SkPixmap& dst, const SkPixmap& src, OrientFlags);
static bool ShouldSwapWidthHeight(SkEncodedOrigin o);
static SkImageInfo SwapWidthHeight(const SkImageInfo& info);
/**
* Decode an image and then copy into dst, applying origin.
*
* @param dst SkPixmap to write the final image, after
* applying the origin.
* @param origin SkEncodedOrigin to apply to the raw pixels.
* @param decode Function for decoding into a pixmap without
* applying the origin.
*/
static bool Orient(const SkPixmap& dst, SkEncodedOrigin origin,
std::function<bool(const SkPixmap&)> decode) {
SkAutoPixmapStorage storage;
const SkPixmap* tmp = &dst;
if (origin != kTopLeft_SkEncodedOrigin) {
auto info = dst.info();
if (ShouldSwapWidthHeight(origin)) {
info = SwapWidthHeight(info);
}
if (!storage.tryAlloc(info)) {
return false;
}
tmp = &storage;
}
if (!decode(*tmp)) {
return false;
}
if (tmp != &dst) {
return Orient(dst, *tmp, OriginToOrient(origin));
}
return true;
}
static void ResetPixmapKeepInfo(SkPixmap* pm, const void* address, size_t rowBytes) {
pm->fRowBytes = rowBytes;
pm->fPixels = address;
}
};
#endif
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