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