reed@google.com | f6627b7 | 2012-07-27 18:02:50 +0000 | [diff] [blame] | 1 | #include "SkImage.h" |
| 2 | |
| 3 | #include "SkBitmap.h" |
| 4 | |
| 5 | /////////////////////////////////////////////////////////////////////////////// |
| 6 | |
| 7 | class SkImage_Base : public SkImage { |
| 8 | public: |
| 9 | SkImage_Base(int width, int height) : INHERITED(width, height) {} |
| 10 | |
| 11 | virtual const SkBitmap* asABitmap() { return NULL; } |
| 12 | |
| 13 | private: |
| 14 | typedef SkImage INHERITED; |
| 15 | }; |
| 16 | |
| 17 | static SkImage_Base* asIB(SkImage* image) { |
| 18 | return static_cast<SkImage_Base*>(image); |
| 19 | } |
| 20 | |
| 21 | /////////////////////////////////////////////////////////////////////////////// |
| 22 | |
| 23 | static SkBitmap::Config InfoToConfig(const SkImage::Info& info, bool* isOpaque) { |
| 24 | switch (info.fColorType) { |
| 25 | case SkImage::kAlpha_8_ColorType: |
| 26 | switch (info.fAlphaType) { |
| 27 | case SkImage::kIgnore_AlphaType: |
| 28 | // makes no sense |
| 29 | return SkBitmap::kNo_Config; |
| 30 | |
| 31 | case SkImage::kOpaque_AlphaType: |
| 32 | *isOpaque = true; |
| 33 | return SkBitmap::kA8_Config; |
| 34 | |
| 35 | case SkImage::kPremul_AlphaType: |
| 36 | case SkImage::kUnpremul_AlphaType: |
| 37 | *isOpaque = false; |
| 38 | return SkBitmap::kA8_Config; |
| 39 | } |
| 40 | break; |
| 41 | |
| 42 | case SkImage::kRGB_565_ColorType: |
| 43 | // we ignore fAlpahType, though some would not make sense |
| 44 | *isOpaque = true; |
| 45 | return SkBitmap::kRGB_565_Config; |
| 46 | |
| 47 | case SkImage::kRGBA_8888_ColorType: |
| 48 | case SkImage::kBGRA_8888_ColorType: |
| 49 | // not supported yet |
| 50 | return SkBitmap::kNo_Config; |
| 51 | |
| 52 | case SkImage::kPMColor_ColorType: |
| 53 | switch (info.fAlphaType) { |
| 54 | case SkImage::kIgnore_AlphaType: |
| 55 | case SkImage::kUnpremul_AlphaType: |
| 56 | // not supported yet |
| 57 | return SkBitmap::kNo_Config; |
| 58 | case SkImage::kOpaque_AlphaType: |
| 59 | *isOpaque = true; |
| 60 | return SkBitmap::kARGB_8888_Config; |
| 61 | case SkImage::kPremul_AlphaType: |
| 62 | *isOpaque = false; |
| 63 | return SkBitmap::kARGB_8888_Config; |
| 64 | } |
| 65 | break; |
| 66 | } |
| 67 | SkASSERT(!"how did we get here"); |
| 68 | return SkBitmap::kNo_Config; |
| 69 | } |
| 70 | |
| 71 | static int BytesPerPixel(SkImage::ColorType ct) { |
| 72 | static const uint8_t gColorTypeBytesPerPixel[] = { |
| 73 | 1, // kAlpha_8_ColorType |
| 74 | 2, // kRGB_565_ColorType |
| 75 | 4, // kRGBA_8888_ColorType |
| 76 | 4, // kBGRA_8888_ColorType |
| 77 | 4, // kPMColor_ColorType |
| 78 | }; |
| 79 | |
| 80 | SkASSERT((size_t)ct < SK_ARRAY_COUNT(gColorTypeBytesPerPixel)); |
| 81 | return gColorTypeBytesPerPixel[ct]; |
| 82 | } |
| 83 | |
| 84 | static size_t ComputeMinRowBytes(const SkImage::Info& info) { |
| 85 | return info.fWidth * BytesPerPixel(info.fColorType); |
| 86 | } |
| 87 | |
| 88 | class SkImage_Raster : public SkImage_Base { |
| 89 | public: |
| 90 | static bool ValidArgs(const Info& info, SkColorSpace* cs, size_t rowBytes) { |
| 91 | const int maxDimension = SK_MaxS32 >> 2; |
| 92 | const size_t kMaxPixelByteSize = SK_MaxS32; |
| 93 | |
| 94 | if (info.fWidth < 0 || info.fHeight < 0) { |
| 95 | return false; |
| 96 | } |
| 97 | if (info.fWidth > maxDimension || info.fHeight > maxDimension) { |
| 98 | return false; |
| 99 | } |
| 100 | if ((unsigned)info.fColorType > (unsigned)kLastEnum_ColorType) { |
| 101 | return false; |
| 102 | } |
| 103 | if ((unsigned)info.fAlphaType > (unsigned)kLastEnum_AlphaType) { |
| 104 | return false; |
| 105 | } |
| 106 | |
| 107 | bool isOpaque; |
| 108 | if (InfoToConfig(info, &isOpaque) == SkBitmap::kNo_Config) { |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | // TODO: check colorspace |
| 113 | |
| 114 | if (rowBytes < ComputeMinRowBytes(info)) { |
| 115 | return false; |
| 116 | } |
| 117 | |
| 118 | int64_t size = (int64_t)info.fHeight * rowBytes; |
| 119 | if (size > kMaxPixelByteSize) { |
| 120 | return false; |
| 121 | } |
| 122 | return true; |
| 123 | } |
| 124 | |
| 125 | static SkImage* NewEmpty(); |
| 126 | |
| 127 | SkImage_Raster(const SkImage::Info&, SkColorSpace*, SkData*, size_t rb); |
| 128 | virtual ~SkImage_Raster(); |
| 129 | |
| 130 | virtual const SkBitmap* asABitmap() SK_OVERRIDE; |
| 131 | |
| 132 | private: |
| 133 | SkImage_Raster() : INHERITED(0, 0) {} |
| 134 | |
| 135 | SkBitmap fBitmap; |
| 136 | |
| 137 | typedef SkImage_Base INHERITED; |
| 138 | }; |
| 139 | |
| 140 | /////////////////////////////////////////////////////////////////////////////// |
| 141 | |
| 142 | #include "SkData.h" |
| 143 | #include "SkDataPixelRef.h" |
| 144 | |
| 145 | SkImage* SkImage_Raster::NewEmpty() { |
| 146 | // Returns lazily created singleton |
| 147 | static SkImage* gEmpty; |
| 148 | if (NULL == gEmpty) { |
| 149 | gEmpty = SkNEW(SkImage_Raster); |
| 150 | } |
| 151 | gEmpty->ref(); |
| 152 | return gEmpty; |
| 153 | } |
| 154 | |
| 155 | SkImage_Raster::SkImage_Raster(const Info& info, SkColorSpace* cs, |
| 156 | SkData* data, size_t rowBytes) |
| 157 | : INHERITED(info.fWidth, info.fHeight) { |
| 158 | bool isOpaque; |
| 159 | SkBitmap::Config config = InfoToConfig(info, &isOpaque); |
| 160 | |
| 161 | fBitmap.setConfig(config, info.fWidth, info.fHeight, rowBytes); |
| 162 | fBitmap.setPixelRef(SkNEW_ARGS(SkDataPixelRef, (data)))->unref(); |
| 163 | fBitmap.setIsOpaque(isOpaque); |
| 164 | fBitmap.setImmutable(); // Yea baby! |
| 165 | } |
| 166 | |
| 167 | SkImage_Raster::~SkImage_Raster() {} |
| 168 | |
| 169 | const SkBitmap* SkImage_Raster::asABitmap() { |
| 170 | return &fBitmap; |
| 171 | } |
| 172 | |
| 173 | /////////////////////////////////////////////////////////////////////////////// |
| 174 | |
| 175 | SkImage* SkImage::NewRasterCopy(const SkImage::Info& info, SkColorSpace* cs, |
| 176 | const void* pixels, size_t rowBytes) { |
| 177 | if (!SkImage_Raster::ValidArgs(info, cs, rowBytes)) { |
| 178 | return NULL; |
| 179 | } |
| 180 | if (0 == info.fWidth && 0 == info.fHeight) { |
| 181 | return SkImage_Raster::NewEmpty(); |
| 182 | } |
| 183 | // check this after empty-check |
| 184 | if (NULL == pixels) { |
| 185 | return NULL; |
| 186 | } |
| 187 | |
| 188 | // Here we actually make a copy of the caller's pixel data |
| 189 | SkAutoDataUnref data(SkData::NewWithCopy(pixels, info.fHeight * rowBytes)); |
| 190 | return SkNEW_ARGS(SkImage_Raster, (info, cs, data, rowBytes)); |
| 191 | } |
| 192 | |
| 193 | |
| 194 | SkImage* SkImage::NewRasterData(const SkImage::Info& info, SkColorSpace* cs, |
| 195 | SkData* pixelData, size_t rowBytes) { |
| 196 | if (!SkImage_Raster::ValidArgs(info, cs, rowBytes)) { |
| 197 | return NULL; |
| 198 | } |
| 199 | if (0 == info.fWidth && 0 == info.fHeight) { |
| 200 | return SkImage_Raster::NewEmpty(); |
| 201 | } |
| 202 | // check this after empty-check |
| 203 | if (NULL == pixelData) { |
| 204 | return NULL; |
| 205 | } |
| 206 | |
| 207 | // did they give us enough data? |
| 208 | size_t size = info.fHeight * rowBytes; |
| 209 | if (pixelData->size() < size) { |
| 210 | return NULL; |
| 211 | } |
| 212 | |
| 213 | SkAutoDataUnref data(pixelData); |
| 214 | return SkNEW_ARGS(SkImage_Raster, (info, cs, data, rowBytes)); |
| 215 | } |
| 216 | |
| 217 | /////////////////////////////////////////////////////////////////////////////// |
| 218 | |
| 219 | #include "SkCanvas.h" |
| 220 | |
| 221 | uint32_t SkImage::NextUniqueID() { |
| 222 | static int32_t gUniqueID; |
| 223 | |
| 224 | // never return 0; |
| 225 | uint32_t id; |
| 226 | do { |
| 227 | id = sk_atomic_inc(&gUniqueID) + 1; |
| 228 | } while (0 == id); |
| 229 | return id; |
| 230 | } |
| 231 | |
| 232 | void SkImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y, |
| 233 | const SkPaint* paint) { |
| 234 | const SkBitmap* bitmap = asIB(this)->asABitmap(); |
| 235 | if (bitmap) { |
| 236 | canvas->drawBitmap(*bitmap, x, y, paint); |
| 237 | } |
| 238 | } |
| 239 | |