michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "SkImagePriv.h"
michael@0: #include "SkCanvas.h"
michael@0: #include "SkPicture.h"
michael@0: 
michael@0: SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType colorType) {
michael@0:     switch (colorType) {
michael@0:         case kAlpha_8_SkColorType:
michael@0:             return SkBitmap::kA8_Config;
michael@0: 
michael@0:         case kARGB_4444_SkColorType:
michael@0:             return SkBitmap::kARGB_4444_Config;
michael@0: 
michael@0:         case kRGB_565_SkColorType:
michael@0:             return SkBitmap::kRGB_565_Config;
michael@0: 
michael@0:         case kPMColor_SkColorType:
michael@0:             return SkBitmap::kARGB_8888_Config;
michael@0: 
michael@0:         case kIndex_8_SkColorType:
michael@0:             return SkBitmap::kIndex8_Config;
michael@0: 
michael@0:         default:
michael@0:             // break for unsupported colortypes
michael@0:             break;
michael@0:     }
michael@0:     return SkBitmap::kNo_Config;
michael@0: }
michael@0: 
michael@0: SkBitmap::Config SkImageInfoToBitmapConfig(const SkImageInfo& info) {
michael@0:     return SkColorTypeToBitmapConfig(info.fColorType);
michael@0: }
michael@0: 
michael@0: SkColorType SkBitmapConfigToColorType(SkBitmap::Config config) {
michael@0:     static const SkColorType gCT[] = {
michael@0:         kUnknown_SkColorType,   // kNo_Config
michael@0:         kAlpha_8_SkColorType,   // kA8_Config
michael@0:         kIndex_8_SkColorType,   // kIndex8_Config
michael@0:         kRGB_565_SkColorType,   // kRGB_565_Config
michael@0:         kARGB_4444_SkColorType, // kARGB_4444_Config
michael@0:         kPMColor_SkColorType,   // kARGB_8888_Config
michael@0:     };
michael@0:     SkASSERT((unsigned)config < SK_ARRAY_COUNT(gCT));
michael@0:     return gCT[config];
michael@0: }
michael@0: 
michael@0: SkImage* SkNewImageFromBitmap(const SkBitmap& bm, bool canSharePixelRef) {
michael@0:     SkImageInfo info;
michael@0:     if (!bm.asImageInfo(&info)) {
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     SkImage* image = NULL;
michael@0:     if (canSharePixelRef || bm.isImmutable()) {
michael@0:         image = SkNewImageFromPixelRef(info, bm.pixelRef(), bm.rowBytes());
michael@0:     } else {
michael@0:         bm.lockPixels();
michael@0:         if (bm.getPixels()) {
michael@0:             image = SkImage::NewRasterCopy(info, bm.getPixels(), bm.rowBytes());
michael@0:         }
michael@0:         bm.unlockPixels();
michael@0:     }
michael@0:     return image;
michael@0: }
michael@0: 
michael@0: static bool needs_layer(const SkPaint& paint) {
michael@0:     return  0xFF != paint.getAlpha() ||
michael@0:     paint.getColorFilter() ||
michael@0:     paint.getImageFilter() ||
michael@0:     SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode);
michael@0: }
michael@0: 
michael@0: void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
michael@0:                             SkScalar x, SkScalar y, const SkPaint* paint) {
michael@0:     int saveCount = canvas->getSaveCount();
michael@0: 
michael@0:     if (paint && needs_layer(*paint)) {
michael@0:         SkRect bounds;
michael@0:         bounds.set(x, y,
michael@0:                    x + SkIntToScalar(picture->width()),
michael@0:                    y + SkIntToScalar(picture->height()));
michael@0:         canvas->saveLayer(&bounds, paint);
michael@0:         canvas->translate(x, y);
michael@0:     } else if (x || y) {
michael@0:         canvas->save();
michael@0:         canvas->translate(x, y);
michael@0:     }
michael@0: 
michael@0:     canvas->drawPicture(*picture);
michael@0:     canvas->restoreToCount(saveCount);
michael@0: }
michael@0: 
michael@0: void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
michael@0:                             const SkRect* src,  const SkRect& dst, const SkPaint* paint) {
michael@0:     int saveCount = canvas->getSaveCount();
michael@0: 
michael@0:     SkMatrix matrix;
michael@0:     SkRect   tmpSrc;
michael@0: 
michael@0:     if (NULL != src) {
michael@0:         tmpSrc = *src;
michael@0:     } else {
michael@0:         tmpSrc.set(0, 0,
michael@0:                    SkIntToScalar(picture->width()),
michael@0:                    SkIntToScalar(picture->height()));
michael@0:     }
michael@0: 
michael@0:     matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);
michael@0:     if (paint && needs_layer(*paint)) {
michael@0:         canvas->saveLayer(&dst, paint);
michael@0:     } else {
michael@0:         canvas->save();
michael@0:     }
michael@0:     canvas->concat(matrix);
michael@0:     if (!paint || !needs_layer(*paint)) {
michael@0:         canvas->clipRect(tmpSrc);
michael@0:     }
michael@0: 
michael@0:     canvas->drawPicture(*picture);
michael@0:     canvas->restoreToCount(saveCount);
michael@0: }