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 "SkBitmap.h"
michael@0: #include "SkCanvas.h"
michael@0: #include "SkImagePriv.h"
michael@0: #include "SkImage_Base.h"
michael@0: 
michael@0: static SkImage_Base* as_IB(SkImage* image) {
michael@0:     return static_cast<SkImage_Base*>(image);
michael@0: }
michael@0: 
michael@0: static const SkImage_Base* as_IB(const SkImage* image) {
michael@0:     return static_cast<const SkImage_Base*>(image);
michael@0: }
michael@0: 
michael@0: uint32_t SkImage::NextUniqueID() {
michael@0:     static int32_t gUniqueID;
michael@0: 
michael@0:     // never return 0;
michael@0:     uint32_t id;
michael@0:     do {
michael@0:         id = sk_atomic_inc(&gUniqueID) + 1;
michael@0:     } while (0 == id);
michael@0:     return id;
michael@0: }
michael@0: 
michael@0: void SkImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y,
michael@0:                    const SkPaint* paint) {
michael@0:     as_IB(this)->onDraw(canvas, x, y, paint);
michael@0: }
michael@0: 
michael@0: void SkImage::draw(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
michael@0:                    const SkPaint* paint) {
michael@0:     as_IB(this)->onDrawRectToRect(canvas, src, dst, paint);
michael@0: }
michael@0: 
michael@0: const void* SkImage::peekPixels(SkImageInfo* info, size_t* rowBytes) const {
michael@0:     SkImageInfo infoStorage;
michael@0:     size_t rowBytesStorage;
michael@0:     if (NULL == info) {
michael@0:         info = &infoStorage;
michael@0:     }
michael@0:     if (NULL == rowBytes) {
michael@0:         rowBytes = &rowBytesStorage;
michael@0:     }
michael@0:     return as_IB(this)->onPeekPixels(info, rowBytes);
michael@0: }
michael@0: 
michael@0: bool SkImage::readPixels(SkBitmap* bitmap, const SkIRect* subset) const {
michael@0:     if (NULL == bitmap) {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     SkIRect bounds = SkIRect::MakeWH(this->width(), this->height());
michael@0: 
michael@0:     // trim against the bitmap, if its already been allocated
michael@0:     if (bitmap->pixelRef()) {
michael@0:         bounds.fRight = SkMin32(bounds.fRight, bitmap->width());
michael@0:         bounds.fBottom = SkMin32(bounds.fBottom, bitmap->height());
michael@0:         if (bounds.isEmpty()) {
michael@0:             return false;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     if (subset && !bounds.intersect(*subset)) {
michael@0:         // perhaps we could return true + empty-bitmap?
michael@0:         return false;
michael@0:     }
michael@0:     return as_IB(this)->onReadPixels(bitmap, bounds);
michael@0: }
michael@0: 
michael@0: GrTexture* SkImage::getTexture() {
michael@0:     return as_IB(this)->onGetTexture();
michael@0: }
michael@0: 
michael@0: SkData* SkImage::encode(SkImageEncoder::Type type, int quality) const {
michael@0:     SkBitmap bm;
michael@0:     if (as_IB(this)->getROPixels(&bm)) {
michael@0:         return SkImageEncoder::EncodeData(bm, type, quality);
michael@0:     }
michael@0:     return NULL;
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: static bool raster_canvas_supports(const SkImageInfo& info) {
michael@0:     switch (info.fColorType) {
michael@0:         case kPMColor_SkColorType:
michael@0:             return kUnpremul_SkAlphaType != info.fAlphaType;
michael@0:         case kRGB_565_SkColorType:
michael@0:             return true;
michael@0:         case kAlpha_8_SkColorType:
michael@0:             return true;
michael@0:         default:
michael@0:             break;
michael@0:     }
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool SkImage_Base::onReadPixels(SkBitmap* bitmap, const SkIRect& subset) const {
michael@0:     SkImageInfo info;
michael@0: 
michael@0:     if (bitmap->pixelRef()) {
michael@0:         if (!bitmap->asImageInfo(&info)) {
michael@0:             return false;
michael@0:         }
michael@0:         if (!raster_canvas_supports(info)) {
michael@0:             return false;
michael@0:         }
michael@0:     } else {
michael@0:         SkImageInfo info = SkImageInfo::MakeN32Premul(subset.width(),
michael@0:                                                       subset.height());
michael@0:         SkBitmap tmp;
michael@0:         if (!tmp.allocPixels(info)) {
michael@0:             return false;
michael@0:         }
michael@0:         *bitmap = tmp;
michael@0:     }
michael@0: 
michael@0:     SkRect srcR, dstR;
michael@0:     srcR.set(subset);
michael@0:     dstR = srcR;
michael@0:     dstR.offset(-dstR.left(), -dstR.top());
michael@0: 
michael@0:     SkCanvas canvas(*bitmap);
michael@0: 
michael@0:     SkPaint paint;
michael@0:     paint.setXfermodeMode(SkXfermode::kClear_Mode);
michael@0:     canvas.drawRect(dstR, paint);
michael@0: 
michael@0:     const_cast<SkImage_Base*>(this)->onDrawRectToRect(&canvas, &srcR, dstR, NULL);
michael@0:     return true;
michael@0: }