1 /*
2 * Copyright 2015 Google Inc.
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 "SkImageSource.h"
9
10 #include "SkCanvas.h"
11 #include "SkDevice.h"
12 #include "SkImage.h"
13 #include "SkReadBuffer.h"
14 #include "SkWriteBuffer.h"
15 #include "SkString.h"
16
Create(const SkImage * image)17 SkImageFilter* SkImageSource::Create(const SkImage* image) {
18 return image ? new SkImageSource(image) : nullptr;
19 }
20
Create(const SkImage * image,const SkRect & srcRect,const SkRect & dstRect,SkFilterQuality filterQuality)21 SkImageFilter* SkImageSource::Create(const SkImage* image,
22 const SkRect& srcRect,
23 const SkRect& dstRect,
24 SkFilterQuality filterQuality) {
25 return image ? new SkImageSource(image, srcRect, dstRect, filterQuality) : nullptr;
26 }
27
SkImageSource(const SkImage * image)28 SkImageSource::SkImageSource(const SkImage* image)
29 : INHERITED(0, nullptr)
30 , fImage(SkRef(image))
31 , fSrcRect(SkRect::MakeIWH(image->width(), image->height()))
32 , fDstRect(fSrcRect)
33 , fFilterQuality(kHigh_SkFilterQuality) { }
34
SkImageSource(const SkImage * image,const SkRect & srcRect,const SkRect & dstRect,SkFilterQuality filterQuality)35 SkImageSource::SkImageSource(const SkImage* image,
36 const SkRect& srcRect,
37 const SkRect& dstRect,
38 SkFilterQuality filterQuality)
39 : INHERITED(0, nullptr)
40 , fImage(SkRef(image))
41 , fSrcRect(srcRect)
42 , fDstRect(dstRect)
43 , fFilterQuality(filterQuality) { }
44
CreateProc(SkReadBuffer & buffer)45 SkFlattenable* SkImageSource::CreateProc(SkReadBuffer& buffer) {
46 SkFilterQuality filterQuality = (SkFilterQuality)buffer.readInt();
47
48 SkRect src, dst;
49 buffer.readRect(&src);
50 buffer.readRect(&dst);
51
52 SkAutoTUnref<SkImage> image(buffer.readImage());
53 if (!image) {
54 return nullptr;
55 }
56
57 return SkImageSource::Create(image, src, dst, filterQuality);
58 }
59
flatten(SkWriteBuffer & buffer) const60 void SkImageSource::flatten(SkWriteBuffer& buffer) const {
61 buffer.writeInt(fFilterQuality);
62 buffer.writeRect(fSrcRect);
63 buffer.writeRect(fDstRect);
64 buffer.writeImage(fImage);
65 }
66
onFilterImageDeprecated(Proxy * proxy,const SkBitmap & src,const Context & ctx,SkBitmap * result,SkIPoint * offset) const67 bool SkImageSource::onFilterImageDeprecated(Proxy* proxy, const SkBitmap& src, const Context& ctx,
68 SkBitmap* result, SkIPoint* offset) const {
69 SkRect dstRect;
70 ctx.ctm().mapRect(&dstRect, fDstRect);
71 SkRect bounds = SkRect::MakeIWH(fImage->width(), fImage->height());
72 if (fSrcRect == bounds && dstRect == bounds) {
73 // No regions cropped out or resized; return entire image.
74 offset->fX = offset->fY = 0;
75 return fImage->asLegacyBitmap(result, SkImage::kRO_LegacyBitmapMode);
76 }
77
78 const SkIRect dstIRect = dstRect.roundOut();
79 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstIRect.width(), dstIRect.height()));
80 if (nullptr == device.get()) {
81 return false;
82 }
83
84 SkCanvas canvas(device.get());
85 SkPaint paint;
86
87 // Subtract off the integer component of the translation (will be applied in loc, below).
88 dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
89 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
90 // FIXME: this probably shouldn't be necessary, but drawImageRect asserts
91 // None filtering when it's translate-only
92 paint.setFilterQuality(
93 fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
94 kNone_SkFilterQuality : fFilterQuality);
95 canvas.drawImageRect(fImage, fSrcRect, dstRect, &paint, SkCanvas::kStrict_SrcRectConstraint);
96
97 *result = device.get()->accessBitmap(false);
98 offset->fX = dstIRect.fLeft;
99 offset->fY = dstIRect.fTop;
100
101 return true;
102 }
103
computeFastBounds(const SkRect & src,SkRect * dst) const104 void SkImageSource::computeFastBounds(const SkRect& src, SkRect* dst) const {
105 *dst = fDstRect;
106 }
107
108 #ifndef SK_IGNORE_TO_STRING
toString(SkString * str) const109 void SkImageSource::toString(SkString* str) const {
110 str->appendf("SkImageSource: (");
111 str->appendf("src: (%f,%f,%f,%f) dst: (%f,%f,%f,%f) ",
112 fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom,
113 fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom);
114 str->appendf("image: (%d,%d)",
115 fImage->width(), fImage->height());
116 str->append(")");
117 }
118 #endif
119