reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 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 "SkSurface_Base.h" |
| 9 | #include "SkImagePriv.h" |
| 10 | #include "SkCanvas.h" |
reed@google.com | 97af1a6 | 2012-08-28 12:19:02 +0000 | [diff] [blame^] | 11 | #include "SkDevice.h" |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 12 | #include "SkMallocPixelRef.h" |
| 13 | |
| 14 | static const size_t kIgnoreRowBytesValue = (size_t)~0; |
| 15 | |
| 16 | class SkSurface_Raster : public SkSurface_Base { |
| 17 | public: |
| 18 | static bool Valid(const SkImage::Info&, SkColorSpace*, size_t rb = kIgnoreRowBytesValue); |
| 19 | |
| 20 | SkSurface_Raster(const SkImage::Info&, SkColorSpace*, void*, size_t rb); |
| 21 | SkSurface_Raster(const SkImage::Info&, SkColorSpace*, SkPixelRef*, size_t rb); |
| 22 | |
| 23 | virtual SkCanvas* onNewCanvas() SK_OVERRIDE; |
| 24 | virtual SkSurface* onNewSurface(const SkImage::Info&, SkColorSpace*) SK_OVERRIDE; |
| 25 | virtual SkImage* onNewImageShapshot() SK_OVERRIDE; |
| 26 | virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, |
| 27 | const SkPaint*) SK_OVERRIDE; |
reed@google.com | 97af1a6 | 2012-08-28 12:19:02 +0000 | [diff] [blame^] | 28 | virtual void onCopyOnWrite(SkImage*, SkCanvas*) SK_OVERRIDE; |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 29 | |
| 30 | private: |
| 31 | SkBitmap fBitmap; |
| 32 | bool fWeOwnThePixels; |
| 33 | |
| 34 | typedef SkSurface_Base INHERITED; |
| 35 | }; |
| 36 | |
| 37 | /////////////////////////////////////////////////////////////////////////////// |
| 38 | |
| 39 | bool SkSurface_Raster::Valid(const SkImage::Info& info, SkColorSpace* cs, |
| 40 | size_t rowBytes) { |
| 41 | static const size_t kMaxTotalSize = SK_MaxS32; |
| 42 | |
| 43 | bool isOpaque; |
| 44 | SkBitmap::Config config = SkImageInfoToBitmapConfig(info, &isOpaque); |
| 45 | |
| 46 | int shift = 0; |
| 47 | switch (config) { |
| 48 | case SkBitmap::kA8_Config: |
| 49 | shift = 0; |
| 50 | break; |
| 51 | case SkBitmap::kRGB_565_Config: |
| 52 | shift = 1; |
| 53 | break; |
| 54 | case SkBitmap::kARGB_8888_Config: |
| 55 | shift = 2; |
| 56 | break; |
| 57 | default: |
| 58 | return false; |
| 59 | } |
| 60 | |
| 61 | // TODO: examine colorspace |
| 62 | |
| 63 | if (kIgnoreRowBytesValue == rowBytes) { |
| 64 | return true; |
| 65 | } |
| 66 | |
| 67 | uint64_t minRB = (uint64_t)info.fWidth << shift; |
| 68 | if (minRB > rowBytes) { |
| 69 | return false; |
| 70 | } |
| 71 | |
| 72 | size_t alignedRowBytes = rowBytes >> shift << shift; |
| 73 | if (alignedRowBytes != rowBytes) { |
| 74 | return false; |
| 75 | } |
| 76 | |
| 77 | uint64_t size = (uint64_t)info.fHeight * rowBytes; |
| 78 | if (size > kMaxTotalSize) { |
| 79 | return false; |
| 80 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 81 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 82 | return true; |
| 83 | } |
| 84 | |
| 85 | SkSurface_Raster::SkSurface_Raster(const SkImage::Info& info, SkColorSpace* cs, |
| 86 | void* pixels, size_t rb) |
| 87 | : INHERITED(info.fWidth, info.fHeight) { |
| 88 | bool isOpaque; |
| 89 | SkBitmap::Config config = SkImageInfoToBitmapConfig(info, &isOpaque); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 90 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 91 | fBitmap.setConfig(config, info.fWidth, info.fHeight, rb); |
| 92 | fBitmap.setPixels(pixels); |
| 93 | fBitmap.setIsOpaque(isOpaque); |
reed@google.com | 97af1a6 | 2012-08-28 12:19:02 +0000 | [diff] [blame^] | 94 | fWeOwnThePixels = false; // We are "Direct" |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | SkSurface_Raster::SkSurface_Raster(const SkImage::Info& info, SkColorSpace* cs, |
| 98 | SkPixelRef* pr, size_t rb) |
| 99 | : INHERITED(info.fWidth, info.fHeight) { |
| 100 | bool isOpaque; |
| 101 | SkBitmap::Config config = SkImageInfoToBitmapConfig(info, &isOpaque); |
| 102 | |
| 103 | fBitmap.setConfig(config, info.fWidth, info.fHeight, rb); |
| 104 | fBitmap.setPixelRef(pr); |
| 105 | fBitmap.setIsOpaque(isOpaque); |
| 106 | fWeOwnThePixels = true; |
| 107 | |
| 108 | if (!isOpaque) { |
| 109 | fBitmap.eraseColor(0); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | SkCanvas* SkSurface_Raster::onNewCanvas() { |
| 114 | return SkNEW_ARGS(SkCanvas, (fBitmap)); |
| 115 | } |
| 116 | |
| 117 | SkSurface* SkSurface_Raster::onNewSurface(const SkImage::Info& info, |
| 118 | SkColorSpace* cs) { |
| 119 | return SkSurface::NewRaster(info, cs); |
| 120 | } |
| 121 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 122 | void SkSurface_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, |
| 123 | const SkPaint* paint) { |
| 124 | canvas->drawBitmap(fBitmap, x, y, paint); |
| 125 | } |
| 126 | |
reed@google.com | 97af1a6 | 2012-08-28 12:19:02 +0000 | [diff] [blame^] | 127 | SkImage* SkSurface_Raster::onNewImageShapshot() { |
| 128 | return SkNewImageFromBitmap(fBitmap, fWeOwnThePixels); |
| 129 | } |
| 130 | |
| 131 | void SkSurface_Raster::onCopyOnWrite(SkImage* image, SkCanvas* canvas) { |
| 132 | // are we sharing pixelrefs with the image? |
| 133 | if (SkBitmapImageGetPixelRef(image) == fBitmap.pixelRef()) { |
| 134 | SkASSERT(fWeOwnThePixels); |
| 135 | SkBitmap prev(fBitmap); |
| 136 | prev.deepCopyTo(&fBitmap, prev.config()); |
| 137 | // Now fBitmap is a deep copy of itself (and therefore different from |
| 138 | // what is being used by the image. Next we update the canvas to use |
| 139 | // this as its backend, so we can't modify the image's pixels anymore. |
| 140 | canvas->getDevice()->replaceBitmapBackendForRasterSurface(fBitmap); |
| 141 | } |
| 142 | } |
| 143 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 144 | /////////////////////////////////////////////////////////////////////////////// |
| 145 | |
| 146 | SkSurface* SkSurface::NewRasterDirect(const SkImage::Info& info, |
| 147 | SkColorSpace* cs, |
| 148 | void* pixels, size_t rowBytes) { |
| 149 | if (!SkSurface_Raster::Valid(info, cs, rowBytes)) { |
| 150 | return NULL; |
| 151 | } |
| 152 | if (NULL == pixels) { |
| 153 | return NULL; |
| 154 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 155 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 156 | return SkNEW_ARGS(SkSurface_Raster, (info, cs, pixels, rowBytes)); |
| 157 | } |
| 158 | |
| 159 | SkSurface* SkSurface::NewRaster(const SkImage::Info& info, SkColorSpace* cs) { |
| 160 | if (!SkSurface_Raster::Valid(info, cs)) { |
| 161 | return NULL; |
| 162 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 163 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 164 | static const size_t kMaxTotalSize = SK_MaxS32; |
| 165 | size_t rowBytes = SkImageMinRowBytes(info); |
| 166 | uint64_t size64 = (uint64_t)info.fHeight * rowBytes; |
| 167 | if (size64 > kMaxTotalSize) { |
| 168 | return NULL; |
| 169 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 170 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 171 | size_t size = (size_t)size64; |
| 172 | void* pixels = sk_malloc_throw(size); |
| 173 | if (NULL == pixels) { |
| 174 | return NULL; |
| 175 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 176 | |
reed@google.com | c906204 | 2012-07-30 18:06:00 +0000 | [diff] [blame] | 177 | SkAutoTUnref<SkPixelRef> pr(SkNEW_ARGS(SkMallocPixelRef, (pixels, size, NULL, true))); |
| 178 | return SkNEW_ARGS(SkSurface_Raster, (info, cs, pr, rowBytes)); |
| 179 | } |
| 180 | |