1 /*
2 * Copyright 2012 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkBitmapSource.h"
9 #include "SkDevice.h"
10 #include "SkCanvas.h"
11 #include "SkFlattenableBuffers.h"
12 #include "SkValidationUtils.h"
13
SkBitmapSource(const SkBitmap & bitmap)14 SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap)
15 : INHERITED(0, 0),
16 fBitmap(bitmap),
17 fSrcRect(SkRect::MakeWH(SkIntToScalar(bitmap.width()),
18 SkIntToScalar(bitmap.height()))),
19 fDstRect(fSrcRect) {
20 }
21
SkBitmapSource(const SkBitmap & bitmap,const SkRect & srcRect,const SkRect & dstRect)22 SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap, const SkRect& srcRect, const SkRect& dstRect)
23 : INHERITED(0, 0),
24 fBitmap(bitmap),
25 fSrcRect(srcRect),
26 fDstRect(dstRect) {
27 }
28
SkBitmapSource(SkFlattenableReadBuffer & buffer)29 SkBitmapSource::SkBitmapSource(SkFlattenableReadBuffer& buffer)
30 : INHERITED(0, buffer) {
31 fBitmap.unflatten(buffer);
32 buffer.readRect(&fSrcRect);
33 buffer.readRect(&fDstRect);
34 buffer.validate(SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
35 }
36
flatten(SkFlattenableWriteBuffer & buffer) const37 void SkBitmapSource::flatten(SkFlattenableWriteBuffer& buffer) const {
38 this->INHERITED::flatten(buffer);
39 fBitmap.flatten(buffer);
40 buffer.writeRect(fSrcRect);
41 buffer.writeRect(fDstRect);
42 }
43
onFilterImage(Proxy * proxy,const SkBitmap &,const SkMatrix & matrix,SkBitmap * result,SkIPoint * offset)44 bool SkBitmapSource::onFilterImage(Proxy* proxy, const SkBitmap&, const SkMatrix& matrix,
45 SkBitmap* result, SkIPoint* offset) {
46 SkRect bounds, dstRect;
47 fBitmap.getBounds(&bounds);
48 matrix.mapRect(&dstRect, fDstRect);
49 if (fSrcRect == bounds && dstRect == bounds) {
50 // No regions cropped out or resized; return entire bitmap.
51 *result = fBitmap;
52 return true;
53 }
54 SkIRect dstIRect;
55 dstRect.roundOut(&dstIRect);
56
57 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstIRect.width(), dstIRect.height()));
58 if (NULL == device.get()) {
59 return false;
60 }
61
62 SkCanvas canvas(device.get());
63 SkPaint paint;
64
65 // Subtract off the integer component of the translation (will be applied in loc, below).
66 dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
67 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
68 // FIXME: this probably shouldn't be necessary, but drawBitmapRectToRect asserts
69 // None filtering when it's translate-only
70 paint.setFilterLevel(
71 fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
72 SkPaint::kNone_FilterLevel : SkPaint::kMedium_FilterLevel);
73 canvas.drawBitmapRectToRect(fBitmap, &fSrcRect, dstRect, &paint);
74
75 *result = device.get()->accessBitmap(false);
76 offset->fX += dstIRect.fLeft;
77 offset->fY += dstIRect.fTop;
78 return true;
79 }
80