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comparison: gfx/skia/trunk/src/image/SkImage.cpp
gfx/skia/trunk/src/image/SkImage.cpp
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| 1 /* | |
| 2 * Copyright 2012 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 "SkBitmap.h" | |
| 9 #include "SkCanvas.h" | |
| 10 #include "SkImagePriv.h" | |
| 11 #include "SkImage_Base.h" | |
| 12 | |
| 13 static SkImage_Base* as_IB(SkImage* image) { | |
| 14 return static_cast<SkImage_Base*>(image); | |
| 15 } | |
| 16 | |
| 17 static const SkImage_Base* as_IB(const SkImage* image) { | |
| 18 return static_cast<const SkImage_Base*>(image); | |
| 19 } | |
| 20 | |
| 21 uint32_t SkImage::NextUniqueID() { | |
| 22 static int32_t gUniqueID; | |
| 23 | |
| 24 // never return 0; | |
| 25 uint32_t id; | |
| 26 do { | |
| 27 id = sk_atomic_inc(&gUniqueID) + 1; | |
| 28 } while (0 == id); | |
| 29 return id; | |
| 30 } | |
| 31 | |
| 32 void SkImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y, | |
| 33 const SkPaint* paint) { | |
| 34 as_IB(this)->onDraw(canvas, x, y, paint); | |
| 35 } | |
| 36 | |
| 37 void SkImage::draw(SkCanvas* canvas, const SkRect* src, const SkRect& dst, | |
| 38 const SkPaint* paint) { | |
| 39 as_IB(this)->onDrawRectToRect(canvas, src, dst, paint); | |
| 40 } | |
| 41 | |
| 42 const void* SkImage::peekPixels(SkImageInfo* info, size_t* rowBytes) const { | |
| 43 SkImageInfo infoStorage; | |
| 44 size_t rowBytesStorage; | |
| 45 if (NULL == info) { | |
| 46 info = &infoStorage; | |
| 47 } | |
| 48 if (NULL == rowBytes) { | |
| 49 rowBytes = &rowBytesStorage; | |
| 50 } | |
| 51 return as_IB(this)->onPeekPixels(info, rowBytes); | |
| 52 } | |
| 53 | |
| 54 bool SkImage::readPixels(SkBitmap* bitmap, const SkIRect* subset) const { | |
| 55 if (NULL == bitmap) { | |
| 56 return false; | |
| 57 } | |
| 58 | |
| 59 SkIRect bounds = SkIRect::MakeWH(this->width(), this->height()); | |
| 60 | |
| 61 // trim against the bitmap, if its already been allocated | |
| 62 if (bitmap->pixelRef()) { | |
| 63 bounds.fRight = SkMin32(bounds.fRight, bitmap->width()); | |
| 64 bounds.fBottom = SkMin32(bounds.fBottom, bitmap->height()); | |
| 65 if (bounds.isEmpty()) { | |
| 66 return false; | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 if (subset && !bounds.intersect(*subset)) { | |
| 71 // perhaps we could return true + empty-bitmap? | |
| 72 return false; | |
| 73 } | |
| 74 return as_IB(this)->onReadPixels(bitmap, bounds); | |
| 75 } | |
| 76 | |
| 77 GrTexture* SkImage::getTexture() { | |
| 78 return as_IB(this)->onGetTexture(); | |
| 79 } | |
| 80 | |
| 81 SkData* SkImage::encode(SkImageEncoder::Type type, int quality) const { | |
| 82 SkBitmap bm; | |
| 83 if (as_IB(this)->getROPixels(&bm)) { | |
| 84 return SkImageEncoder::EncodeData(bm, type, quality); | |
| 85 } | |
| 86 return NULL; | |
| 87 } | |
| 88 | |
| 89 /////////////////////////////////////////////////////////////////////////////// | |
| 90 | |
| 91 static bool raster_canvas_supports(const SkImageInfo& info) { | |
| 92 switch (info.fColorType) { | |
| 93 case kPMColor_SkColorType: | |
| 94 return kUnpremul_SkAlphaType != info.fAlphaType; | |
| 95 case kRGB_565_SkColorType: | |
| 96 return true; | |
| 97 case kAlpha_8_SkColorType: | |
| 98 return true; | |
| 99 default: | |
| 100 break; | |
| 101 } | |
| 102 return false; | |
| 103 } | |
| 104 | |
| 105 bool SkImage_Base::onReadPixels(SkBitmap* bitmap, const SkIRect& subset) const { | |
| 106 SkImageInfo info; | |
| 107 | |
| 108 if (bitmap->pixelRef()) { | |
| 109 if (!bitmap->asImageInfo(&info)) { | |
| 110 return false; | |
| 111 } | |
| 112 if (!raster_canvas_supports(info)) { | |
| 113 return false; | |
| 114 } | |
| 115 } else { | |
| 116 SkImageInfo info = SkImageInfo::MakeN32Premul(subset.width(), | |
| 117 subset.height()); | |
| 118 SkBitmap tmp; | |
| 119 if (!tmp.allocPixels(info)) { | |
| 120 return false; | |
| 121 } | |
| 122 *bitmap = tmp; | |
| 123 } | |
| 124 | |
| 125 SkRect srcR, dstR; | |
| 126 srcR.set(subset); | |
| 127 dstR = srcR; | |
| 128 dstR.offset(-dstR.left(), -dstR.top()); | |
| 129 | |
| 130 SkCanvas canvas(*bitmap); | |
| 131 | |
| 132 SkPaint paint; | |
| 133 paint.setXfermodeMode(SkXfermode::kClear_Mode); | |
| 134 canvas.drawRect(dstR, paint); | |
| 135 | |
| 136 const_cast<SkImage_Base*>(this)->onDrawRectToRect(&canvas, &srcR, dstR, NULL); | |
| 137 return true; | |
| 138 } |
