michael@0: /*
michael@0:  * Copyright 2012 The Android Open Source Project
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 "SkBitmapSource.h"
michael@0: #include "SkDevice.h"
michael@0: #include "SkCanvas.h"
michael@0: #include "SkReadBuffer.h"
michael@0: #include "SkWriteBuffer.h"
michael@0: #include "SkValidationUtils.h"
michael@0: 
michael@0: SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap)
michael@0:   : INHERITED(0, 0),
michael@0:     fBitmap(bitmap),
michael@0:     fSrcRect(SkRect::MakeWH(SkIntToScalar(bitmap.width()),
michael@0:                             SkIntToScalar(bitmap.height()))),
michael@0:     fDstRect(fSrcRect) {
michael@0: }
michael@0: 
michael@0: SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap, const SkRect& srcRect, const SkRect& dstRect)
michael@0:   : INHERITED(0, 0),
michael@0:     fBitmap(bitmap),
michael@0:     fSrcRect(srcRect),
michael@0:     fDstRect(dstRect) {
michael@0: }
michael@0: 
michael@0: SkBitmapSource::SkBitmapSource(SkReadBuffer& buffer)
michael@0:   : INHERITED(0, buffer) {
michael@0:     fBitmap.unflatten(buffer);
michael@0:     buffer.readRect(&fSrcRect);
michael@0:     buffer.readRect(&fDstRect);
michael@0:     buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
michael@0: }
michael@0: 
michael@0: void SkBitmapSource::flatten(SkWriteBuffer& buffer) const {
michael@0:     this->INHERITED::flatten(buffer);
michael@0:     fBitmap.flatten(buffer);
michael@0:     buffer.writeRect(fSrcRect);
michael@0:     buffer.writeRect(fDstRect);
michael@0: }
michael@0: 
michael@0: bool SkBitmapSource::onFilterImage(Proxy* proxy, const SkBitmap&, const Context& ctx,
michael@0:                                    SkBitmap* result, SkIPoint* offset) const {
michael@0:     SkRect bounds, dstRect;
michael@0:     fBitmap.getBounds(&bounds);
michael@0:     ctx.ctm().mapRect(&dstRect, fDstRect);
michael@0:     if (fSrcRect == bounds && dstRect == bounds) {
michael@0:         // No regions cropped out or resized; return entire bitmap.
michael@0:         *result = fBitmap;
michael@0:         offset->fX = offset->fY = 0;
michael@0:         return true;
michael@0:     }
michael@0:     SkIRect dstIRect;
michael@0:     dstRect.roundOut(&dstIRect);
michael@0: 
michael@0:     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstIRect.width(), dstIRect.height()));
michael@0:     if (NULL == device.get()) {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     SkCanvas canvas(device.get());
michael@0:     SkPaint paint;
michael@0: 
michael@0:     // Subtract off the integer component of the translation (will be applied in loc, below).
michael@0:     dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
michael@0:     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
michael@0:     // FIXME: this probably shouldn't be necessary, but drawBitmapRectToRect asserts
michael@0:     // None filtering when it's translate-only
michael@0:     paint.setFilterLevel(
michael@0:         fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
michael@0:         SkPaint::kNone_FilterLevel : SkPaint::kHigh_FilterLevel);
michael@0:     canvas.drawBitmapRectToRect(fBitmap, &fSrcRect, dstRect, &paint);
michael@0: 
michael@0:     *result = device.get()->accessBitmap(false);
michael@0:     offset->fX = dstIRect.fLeft;
michael@0:     offset->fY = dstIRect.fTop;
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: void SkBitmapSource::computeFastBounds(const SkRect&, SkRect* dst) const {
michael@0:     *dst = fDstRect;
michael@0: }
michael@0: 
michael@0: bool SkBitmapSource::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
michael@0:                                     SkIRect* dst) const {
michael@0:     *dst = src;
michael@0:     return true;
michael@0: }