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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