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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImagePriv.h"
#include "SkCanvas.h"
#include "SkPicture.h"
SkBitmap::Config SkImageInfoToBitmapConfig(const SkImage::Info& info,
bool* isOpaque) {
switch (info.fColorType) {
case SkImage::kAlpha_8_ColorType:
switch (info.fAlphaType) {
case kIgnore_SkAlphaType:
// makes no sense
return SkBitmap::kNo_Config;
case kOpaque_SkAlphaType:
*isOpaque = true;
return SkBitmap::kA8_Config;
case kPremul_SkAlphaType:
case kUnpremul_SkAlphaType:
*isOpaque = false;
return SkBitmap::kA8_Config;
}
break;
case SkImage::kRGB_565_ColorType:
// we ignore fAlpahType, though some would not make sense
*isOpaque = true;
return SkBitmap::kRGB_565_Config;
case SkImage::kPMColor_ColorType:
switch (info.fAlphaType) {
case kIgnore_SkAlphaType:
case kUnpremul_SkAlphaType:
// not supported yet
return SkBitmap::kNo_Config;
case kOpaque_SkAlphaType:
*isOpaque = true;
return SkBitmap::kARGB_8888_Config;
case kPremul_SkAlphaType:
*isOpaque = false;
return SkBitmap::kARGB_8888_Config;
}
break;
default:
// break for unsupported colortypes
break;
}
return SkBitmap::kNo_Config;
}
int SkImageBytesPerPixel(SkImage::ColorType ct) {
static const uint8_t gColorTypeBytesPerPixel[] = {
1, // kAlpha_8_ColorType
2, // kRGB_565_ColorType
4, // kRGBA_8888_ColorType
4, // kBGRA_8888_ColorType
4, // kPMColor_ColorType
};
SkASSERT((size_t)ct < SK_ARRAY_COUNT(gColorTypeBytesPerPixel));
return gColorTypeBytesPerPixel[ct];
}
bool SkBitmapToImageInfo(const SkBitmap& bm, SkImage::Info* info) {
switch (bm.config()) {
case SkBitmap::kA8_Config:
info->fColorType = SkImage::kAlpha_8_ColorType;
break;
case SkBitmap::kRGB_565_Config:
info->fColorType = SkImage::kRGB_565_ColorType;
break;
case SkBitmap::kARGB_8888_Config:
info->fColorType = SkImage::kPMColor_ColorType;
break;
default:
return false;
}
info->fWidth = bm.width();
info->fHeight = bm.height();
info->fAlphaType = bm.isOpaque() ? kOpaque_SkAlphaType :
kPremul_SkAlphaType;
return true;
}
SkImage* SkNewImageFromBitmap(const SkBitmap& bm, bool canSharePixelRef) {
SkImage::Info info;
if (!SkBitmapToImageInfo(bm, &info)) {
return NULL;
}
SkImage* image = NULL;
if (canSharePixelRef || bm.isImmutable()) {
image = SkNewImageFromPixelRef(info, bm.pixelRef(), bm.rowBytes());
} else {
bm.lockPixels();
if (bm.getPixels()) {
image = SkImage::NewRasterCopy(info, bm.getPixels(), bm.rowBytes());
}
bm.unlockPixels();
}
return image;
}
static bool needs_layer(const SkPaint& paint) {
return 0xFF != paint.getAlpha() ||
paint.getColorFilter() ||
paint.getImageFilter() ||
SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode);
}
void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
SkScalar x, SkScalar y, const SkPaint* paint) {
int saveCount = canvas->getSaveCount();
if (paint && needs_layer(*paint)) {
SkRect bounds;
bounds.set(x, y,
x + SkIntToScalar(picture->width()),
y + SkIntToScalar(picture->height()));
canvas->saveLayer(&bounds, paint);
canvas->translate(x, y);
} else if (x || y) {
canvas->save();
canvas->translate(x, y);
}
canvas->drawPicture(*picture);
canvas->restoreToCount(saveCount);
}
void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
const SkRect* src, const SkRect& dst, const SkPaint* paint) {
int saveCount = canvas->getSaveCount();
SkMatrix matrix;
SkRect tmpSrc;
if (NULL != src) {
tmpSrc = *src;
} else {
tmpSrc.set(0, 0,
SkIntToScalar(picture->width()),
SkIntToScalar(picture->height()));
}
matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);
if (paint && needs_layer(*paint)) {
canvas->saveLayer(&dst, paint);
} else {
canvas->save();
}
canvas->concat(matrix);
if (!paint || !needs_layer(*paint)) {
canvas->clipRect(tmpSrc);
}
canvas->drawPicture(*picture);
canvas->restoreToCount(saveCount);
}
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