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comparison: image/decoders/nsPNGDecoder.h
image/decoders/nsPNGDecoder.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef nsPNGDecoder_h__ | |
| 8 #define nsPNGDecoder_h__ | |
| 9 | |
| 10 #include "Decoder.h" | |
| 11 | |
| 12 #include "gfxTypes.h" | |
| 13 | |
| 14 #include "nsCOMPtr.h" | |
| 15 | |
| 16 #include "png.h" | |
| 17 | |
| 18 #include "qcms.h" | |
| 19 | |
| 20 namespace mozilla { | |
| 21 namespace image { | |
| 22 class RasterImage; | |
| 23 | |
| 24 class nsPNGDecoder : public Decoder | |
| 25 { | |
| 26 public: | |
| 27 nsPNGDecoder(RasterImage &aImage); | |
| 28 virtual ~nsPNGDecoder(); | |
| 29 | |
| 30 virtual void InitInternal(); | |
| 31 virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy); | |
| 32 virtual Telemetry::ID SpeedHistogram(); | |
| 33 | |
| 34 void CreateFrame(png_uint_32 x_offset, png_uint_32 y_offset, | |
| 35 int32_t width, int32_t height, | |
| 36 gfxImageFormat format); | |
| 37 void EndImageFrame(); | |
| 38 | |
| 39 // Check if PNG is valid ICO (32bpp RGBA) | |
| 40 // http://blogs.msdn.com/b/oldnewthing/archive/2010/10/22/10079192.aspx | |
| 41 bool IsValidICO() const | |
| 42 { | |
| 43 // If there are errors in the call to png_get_IHDR, the error_callback in | |
| 44 // nsPNGDecoder.cpp is called. In this error callback we do a longjmp, so | |
| 45 // we need to save the jump buffer here. Oterwise we'll end up without a | |
| 46 // proper callstack. | |
| 47 if (setjmp(png_jmpbuf(mPNG))) { | |
| 48 // We got here from a longjmp call indirectly from png_get_IHDR | |
| 49 return false; | |
| 50 } | |
| 51 | |
| 52 png_uint_32 | |
| 53 png_width, // Unused | |
| 54 png_height; // Unused | |
| 55 | |
| 56 int png_bit_depth, | |
| 57 png_color_type; | |
| 58 | |
| 59 if (png_get_IHDR(mPNG, mInfo, &png_width, &png_height, &png_bit_depth, | |
| 60 &png_color_type, nullptr, nullptr, nullptr)) { | |
| 61 | |
| 62 return ((png_color_type == PNG_COLOR_TYPE_RGB_ALPHA || | |
| 63 png_color_type == PNG_COLOR_TYPE_RGB) && | |
| 64 png_bit_depth == 8); | |
| 65 } else { | |
| 66 return false; | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 public: | |
| 71 png_structp mPNG; | |
| 72 png_infop mInfo; | |
| 73 nsIntRect mFrameRect; | |
| 74 uint8_t *mCMSLine; | |
| 75 uint8_t *interlacebuf; | |
| 76 qcms_profile *mInProfile; | |
| 77 qcms_transform *mTransform; | |
| 78 | |
| 79 gfxImageFormat format; | |
| 80 | |
| 81 // For size decodes | |
| 82 uint8_t mSizeBytes[8]; // Space for width and height, both 4 bytes | |
| 83 uint32_t mHeaderBytesRead; | |
| 84 | |
| 85 // whether CMS or premultiplied alpha are forced off | |
| 86 uint32_t mCMSMode; | |
| 87 | |
| 88 uint8_t mChannels; | |
| 89 bool mFrameHasNoAlpha; | |
| 90 bool mFrameIsHidden; | |
| 91 bool mDisablePremultipliedAlpha; | |
| 92 | |
| 93 struct AnimFrameInfo | |
| 94 { | |
| 95 AnimFrameInfo(); | |
| 96 #ifdef PNG_APNG_SUPPORTED | |
| 97 AnimFrameInfo(png_structp aPNG, png_infop aInfo); | |
| 98 #endif | |
| 99 | |
| 100 FrameBlender::FrameDisposalMethod mDispose; | |
| 101 FrameBlender::FrameBlendMethod mBlend; | |
| 102 int32_t mTimeout; | |
| 103 }; | |
| 104 | |
| 105 AnimFrameInfo mAnimInfo; | |
| 106 | |
| 107 // The number of frames we've finished. | |
| 108 uint32_t mNumFrames; | |
| 109 | |
| 110 /* | |
| 111 * libpng callbacks | |
| 112 * | |
| 113 * We put these in the class so that they can access protected members. | |
| 114 */ | |
| 115 static void PNGAPI info_callback(png_structp png_ptr, png_infop info_ptr); | |
| 116 static void PNGAPI row_callback(png_structp png_ptr, png_bytep new_row, | |
| 117 png_uint_32 row_num, int pass); | |
| 118 #ifdef PNG_APNG_SUPPORTED | |
| 119 static void PNGAPI frame_info_callback(png_structp png_ptr, | |
| 120 png_uint_32 frame_num); | |
| 121 #endif | |
| 122 static void PNGAPI end_callback(png_structp png_ptr, png_infop info_ptr); | |
| 123 static void PNGAPI error_callback(png_structp png_ptr, | |
| 124 png_const_charp error_msg); | |
| 125 static void PNGAPI warning_callback(png_structp png_ptr, | |
| 126 png_const_charp warning_msg); | |
| 127 | |
| 128 // This is defined in the PNG spec as an invariant. We use it to | |
| 129 // do manual validation without libpng. | |
| 130 static const uint8_t pngSignatureBytes[]; | |
| 131 }; | |
| 132 | |
| 133 } // namespace image | |
| 134 } // namespace mozilla | |
| 135 | |
| 136 #endif // nsPNGDecoder_h__ |
