/image/decoders/nsPNGDecoder.h
http://github.com/zpao/v8monkey · C Header · 147 lines · 73 code · 24 blank · 50 comment · 4 complexity · 2cd5683da5714f44632d86034c9324fd MD5 · raw file
- /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
- *
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 2001
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Stuart Parmenter <pavlov@netscape.com>
- * Bobby Holley <bobbyholley@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef nsPNGDecoder_h__
- #define nsPNGDecoder_h__
- #include "Decoder.h"
- #include "imgIDecoderObserver.h"
- #include "gfxASurface.h"
- #include "nsCOMPtr.h"
- #include "png.h"
- #include "qcms.h"
- namespace mozilla {
- namespace image {
- class RasterImage;
- class nsPNGDecoder : public Decoder
- {
- public:
- nsPNGDecoder(RasterImage &aImage, imgIDecoderObserver* aObserver);
- virtual ~nsPNGDecoder();
- virtual void InitInternal();
- virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
- virtual Telemetry::ID SpeedHistogram();
- void CreateFrame(png_uint_32 x_offset, png_uint_32 y_offset,
- PRInt32 width, PRInt32 height,
- gfxASurface::gfxImageFormat format);
- void SetAnimFrameInfo();
- void EndImageFrame();
- // Check if PNG is valid ICO (32bpp RGBA)
- // http://blogs.msdn.com/b/oldnewthing/archive/2010/10/22/10079192.aspx
- bool IsValidICO() const
- {
- png_uint_32
- png_width, // Unused
- png_height; // Unused
- int png_bit_depth,
- png_color_type;
- if (png_get_IHDR(mPNG, mInfo, &png_width, &png_height, &png_bit_depth,
- &png_color_type, NULL, NULL, NULL)) {
- return (png_color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
- png_bit_depth == 8);
- } else {
- return false;
- }
- }
- public:
- png_structp mPNG;
- png_infop mInfo;
- nsIntRect mFrameRect;
- PRUint8 *mCMSLine;
- PRUint8 *interlacebuf;
- PRUint8 *mImageData;
- qcms_profile *mInProfile;
- qcms_transform *mTransform;
- gfxASurface::gfxImageFormat format;
- // For size decodes
- PRUint8 *mHeaderBuf;
- PRUint32 mHeaderBytesRead;
- PRUint8 mChannels;
- bool mFrameHasNoAlpha;
- bool mFrameIsHidden;
- // whether CMS or premultiplied alpha are forced off
- PRUint32 mCMSMode;
- bool mDisablePremultipliedAlpha;
-
- /*
- * libpng callbacks
- *
- * We put these in the class so that they can access protected members.
- */
- static void PNGAPI info_callback(png_structp png_ptr, png_infop info_ptr);
- static void PNGAPI row_callback(png_structp png_ptr, png_bytep new_row,
- png_uint_32 row_num, int pass);
- #ifdef PNG_APNG_SUPPORTED
- static void PNGAPI frame_info_callback(png_structp png_ptr,
- png_uint_32 frame_num);
- #endif
- static void PNGAPI end_callback(png_structp png_ptr, png_infop info_ptr);
- static void PNGAPI error_callback(png_structp png_ptr,
- png_const_charp error_msg);
- static void PNGAPI warning_callback(png_structp png_ptr,
- png_const_charp warning_msg);
- // This is defined in the PNG spec as an invariant. We use it to
- // do manual validation without libpng.
- static const PRUint8 pngSignatureBytes[];
- };
- } // namespace image
- } // namespace mozilla
- #endif // nsPNGDecoder_h__