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gfx/skia/trunk/src/image/SkImage_Raster.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/image/SkImage_Raster.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0 1 /*
michael@0 2 * Copyright 2012 Google Inc.
michael@0 3 *
michael@0 4 * Use of this source code is governed by a BSD-style license that can be
michael@0 5 * found in the LICENSE file.
michael@0 6 */
michael@0 7
michael@0 8 #include "SkImage_Base.h"
michael@0 9 #include "SkImagePriv.h"
michael@0 10 #include "SkBitmap.h"
michael@0 11 #include "SkCanvas.h"
michael@0 12 #include "SkData.h"
michael@0 13 #include "SkMallocPixelRef.h"
michael@0 14
michael@0 15 class SkImage_Raster : public SkImage_Base {
michael@0 16 public:
michael@0 17 static bool ValidArgs(const Info& info, size_t rowBytes) {
michael@0 18 const int maxDimension = SK_MaxS32 >> 2;
michael@0 19 const size_t kMaxPixelByteSize = SK_MaxS32;
michael@0 20
michael@0 21 if (info.fWidth < 0 || info.fHeight < 0) {
michael@0 22 return false;
michael@0 23 }
michael@0 24 if (info.fWidth > maxDimension || info.fHeight > maxDimension) {
michael@0 25 return false;
michael@0 26 }
michael@0 27 if ((unsigned)info.fColorType > (unsigned)kLastEnum_SkColorType) {
michael@0 28 return false;
michael@0 29 }
michael@0 30 if ((unsigned)info.fAlphaType > (unsigned)kLastEnum_SkAlphaType) {
michael@0 31 return false;
michael@0 32 }
michael@0 33
michael@0 34 if (SkImageInfoToBitmapConfig(info) == SkBitmap::kNo_Config) {
michael@0 35 return false;
michael@0 36 }
michael@0 37
michael@0 38 // TODO: check colorspace
michael@0 39
michael@0 40 if (rowBytes < SkImageMinRowBytes(info)) {
michael@0 41 return false;
michael@0 42 }
michael@0 43
michael@0 44 int64_t size = (int64_t)info.fHeight * rowBytes;
michael@0 45 if (size > (int64_t)kMaxPixelByteSize) {
michael@0 46 return false;
michael@0 47 }
michael@0 48 return true;
michael@0 49 }
michael@0 50
michael@0 51 static SkImage* NewEmpty();
michael@0 52
michael@0 53 SkImage_Raster(const SkImageInfo&, SkData*, size_t rb);
michael@0 54 virtual ~SkImage_Raster();
michael@0 55
michael@0 56 virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
michael@0 57 virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) SK_OVERRIDE;
michael@0 58 virtual bool onReadPixels(SkBitmap*, const SkIRect&) const SK_OVERRIDE;
michael@0 59 virtual const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const SK_OVERRIDE;
michael@0 60 virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE;
michael@0 61
michael@0 62 // exposed for SkSurface_Raster via SkNewImageFromPixelRef
michael@0 63 SkImage_Raster(const SkImageInfo&, SkPixelRef*, size_t rowBytes);
michael@0 64
michael@0 65 SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
michael@0 66
michael@0 67 private:
michael@0 68 SkImage_Raster() : INHERITED(0, 0) {}
michael@0 69
michael@0 70 SkBitmap fBitmap;
michael@0 71
michael@0 72 typedef SkImage_Base INHERITED;
michael@0 73 };
michael@0 74
michael@0 75 ///////////////////////////////////////////////////////////////////////////////
michael@0 76
michael@0 77 SkImage* SkImage_Raster::NewEmpty() {
michael@0 78 // Returns lazily created singleton
michael@0 79 static SkImage* gEmpty;
michael@0 80 if (NULL == gEmpty) {
michael@0 81 gEmpty = SkNEW(SkImage_Raster);
michael@0 82 }
michael@0 83 gEmpty->ref();
michael@0 84 return gEmpty;
michael@0 85 }
michael@0 86
michael@0 87 static void release_data(void* addr, void* context) {
michael@0 88 SkData* data = static_cast<SkData*>(context);
michael@0 89 data->unref();
michael@0 90 }
michael@0 91
michael@0 92 SkImage_Raster::SkImage_Raster(const Info& info, SkData* data, size_t rowBytes)
michael@0 93 : INHERITED(info.fWidth, info.fHeight)
michael@0 94 {
michael@0 95 data->ref();
michael@0 96 void* addr = const_cast<void*>(data->data());
michael@0 97
michael@0 98 fBitmap.installPixels(info, addr, rowBytes, release_data, data);
michael@0 99 fBitmap.setImmutable();
michael@0 100 fBitmap.lockPixels();
michael@0 101 }
michael@0 102
michael@0 103 SkImage_Raster::SkImage_Raster(const Info& info, SkPixelRef* pr, size_t rowBytes)
michael@0 104 : INHERITED(info.fWidth, info.fHeight)
michael@0 105 {
michael@0 106 fBitmap.setConfig(info, rowBytes);
michael@0 107 fBitmap.setPixelRef(pr);
michael@0 108 fBitmap.lockPixels();
michael@0 109 }
michael@0 110
michael@0 111 SkImage_Raster::~SkImage_Raster() {}
michael@0 112
michael@0 113 void SkImage_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
michael@0 114 canvas->drawBitmap(fBitmap, x, y, paint);
michael@0 115 }
michael@0 116
michael@0 117 void SkImage_Raster::onDrawRectToRect(SkCanvas* canvas, const SkRect* src,
michael@0 118 const SkRect& dst, const SkPaint* paint) {
michael@0 119 canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
michael@0 120 }
michael@0 121
michael@0 122 bool SkImage_Raster::onReadPixels(SkBitmap* dst, const SkIRect& subset) const {
michael@0 123 if (dst->pixelRef()) {
michael@0 124 return this->INHERITED::onReadPixels(dst, subset);
michael@0 125 } else {
michael@0 126 SkBitmap src;
michael@0 127 if (!fBitmap.extractSubset(&src, subset)) {
michael@0 128 return false;
michael@0 129 }
michael@0 130 return src.copyTo(dst, src.colorType());
michael@0 131 }
michael@0 132 }
michael@0 133
michael@0 134 const void* SkImage_Raster::onPeekPixels(SkImageInfo* infoPtr,
michael@0 135 size_t* rowBytesPtr) const {
michael@0 136 SkImageInfo info;
michael@0 137 if (!fBitmap.asImageInfo(&info) || !fBitmap.getPixels()) {
michael@0 138 return NULL;
michael@0 139 }
michael@0 140 *infoPtr = info;
michael@0 141 *rowBytesPtr = fBitmap.rowBytes();
michael@0 142 return fBitmap.getPixels();
michael@0 143 }
michael@0 144
michael@0 145 bool SkImage_Raster::getROPixels(SkBitmap* dst) const {
michael@0 146 *dst = fBitmap;
michael@0 147 return true;
michael@0 148 }
michael@0 149
michael@0 150 ///////////////////////////////////////////////////////////////////////////////
michael@0 151
michael@0 152 SkImage* SkImage::NewRasterCopy(const SkImageInfo& info, const void* pixels, size_t rowBytes) {
michael@0 153 if (!SkImage_Raster::ValidArgs(info, rowBytes)) {
michael@0 154 return NULL;
michael@0 155 }
michael@0 156 if (0 == info.fWidth && 0 == info.fHeight) {
michael@0 157 return SkImage_Raster::NewEmpty();
michael@0 158 }
michael@0 159 // check this after empty-check
michael@0 160 if (NULL == pixels) {
michael@0 161 return NULL;
michael@0 162 }
michael@0 163
michael@0 164 // Here we actually make a copy of the caller's pixel data
michael@0 165 SkAutoDataUnref data(SkData::NewWithCopy(pixels, info.fHeight * rowBytes));
michael@0 166 return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes));
michael@0 167 }
michael@0 168
michael@0 169
michael@0 170 SkImage* SkImage::NewRasterData(const SkImageInfo& info, SkData* data, size_t rowBytes) {
michael@0 171 if (!SkImage_Raster::ValidArgs(info, rowBytes)) {
michael@0 172 return NULL;
michael@0 173 }
michael@0 174 if (0 == info.fWidth && 0 == info.fHeight) {
michael@0 175 return SkImage_Raster::NewEmpty();
michael@0 176 }
michael@0 177 // check this after empty-check
michael@0 178 if (NULL == data) {
michael@0 179 return NULL;
michael@0 180 }
michael@0 181
michael@0 182 // did they give us enough data?
michael@0 183 size_t size = info.fHeight * rowBytes;
michael@0 184 if (data->size() < size) {
michael@0 185 return NULL;
michael@0 186 }
michael@0 187
michael@0 188 return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes));
michael@0 189 }
michael@0 190
michael@0 191 SkImage* SkNewImageFromPixelRef(const SkImageInfo& info, SkPixelRef* pr,
michael@0 192 size_t rowBytes) {
michael@0 193 return SkNEW_ARGS(SkImage_Raster, (info, pr, rowBytes));
michael@0 194 }
michael@0 195
michael@0 196 SkPixelRef* SkBitmapImageGetPixelRef(SkImage* image) {
michael@0 197 return ((SkImage_Raster*)image)->getPixelRef();
michael@0 198 }

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