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 "SkReadBuffer.h"
12 #include "SkWriteBuffer.h"
13 #include "SkValidationUtils.h"
14
SkBitmapSource(const SkBitmap & bitmap)15 SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap)
16 : INHERITED(0, 0),
17 fBitmap(bitmap),
18 fSrcRect(SkRect::MakeWH(SkIntToScalar(bitmap.width()),
19 SkIntToScalar(bitmap.height()))),
20 fDstRect(fSrcRect) {
21 }
22
SkBitmapSource(const SkBitmap & bitmap,const SkRect & srcRect,const SkRect & dstRect)23 SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap, const SkRect& srcRect, const SkRect& dstRect)
24 : INHERITED(0, 0)
25 , fBitmap(bitmap)
26 , fSrcRect(srcRect)
27 , fDstRect(dstRect) {}
28
SkBitmapSource(SkReadBuffer & buffer)29 SkBitmapSource::SkBitmapSource(SkReadBuffer& buffer) : INHERITED(0, buffer) {
30 if (buffer.isVersionLT(SkReadBuffer::kNoMoreBitmapFlatten_Version)) {
31 fBitmap.legacyUnflatten(buffer);
32 } else {
33 buffer.readBitmap(&fBitmap);
34 }
35 buffer.readRect(&fSrcRect);
36 buffer.readRect(&fDstRect);
37 buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
38 }
39
flatten(SkWriteBuffer & buffer) const40 void SkBitmapSource::flatten(SkWriteBuffer& buffer) const {
41 this->INHERITED::flatten(buffer);
42 buffer.writeBitmap(fBitmap);
43 buffer.writeRect(fSrcRect);
44 buffer.writeRect(fDstRect);
45 }
46
onFilterImage(Proxy * proxy,const SkBitmap &,const Context & ctx,SkBitmap * result,SkIPoint * offset) const47 bool SkBitmapSource::onFilterImage(Proxy* proxy, const SkBitmap&, const Context& ctx,
48 SkBitmap* result, SkIPoint* offset) const {
49 SkRect bounds, dstRect;
50 fBitmap.getBounds(&bounds);
51 ctx.ctm().mapRect(&dstRect, fDstRect);
52 if (fSrcRect == bounds && dstRect == bounds) {
53 // No regions cropped out or resized; return entire bitmap.
54 *result = fBitmap;
55 offset->fX = offset->fY = 0;
56 return true;
57 }
58 SkIRect dstIRect;
59 dstRect.roundOut(&dstIRect);
60
61 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstIRect.width(), dstIRect.height()));
62 if (NULL == device.get()) {
63 return false;
64 }
65
66 SkCanvas canvas(device.get());
67 SkPaint paint;
68
69 // Subtract off the integer component of the translation (will be applied in loc, below).
70 dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
71 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
72 // FIXME: this probably shouldn't be necessary, but drawBitmapRectToRect asserts
73 // None filtering when it's translate-only
74 paint.setFilterLevel(
75 fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
76 SkPaint::kNone_FilterLevel : SkPaint::kHigh_FilterLevel);
77 canvas.drawBitmapRectToRect(fBitmap, &fSrcRect, dstRect, &paint);
78
79 *result = device.get()->accessBitmap(false);
80 offset->fX = dstIRect.fLeft;
81 offset->fY = dstIRect.fTop;
82 return true;
83 }
84
computeFastBounds(const SkRect &,SkRect * dst) const85 void SkBitmapSource::computeFastBounds(const SkRect&, SkRect* dst) const {
86 *dst = fDstRect;
87 }
88
onFilterBounds(const SkIRect & src,const SkMatrix & ctm,SkIRect * dst) const89 bool SkBitmapSource::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
90 SkIRect* dst) const {
91 *dst = src;
92 return true;
93 }
94