2005-09-01 02:15:33 +04:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is PNG Encoding code
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*
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* The Initial Developer of the Original Code is
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* Google Inc.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brett Wilson <brettw@gmail.com>
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* Stuart Parmenter <pavlov@pavlov.net>
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2007-04-25 09:56:53 +04:00
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* Justin Dolske <dolske@mozilla.com>
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2005-09-01 02:15:33 +04:00
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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2007-04-25 09:56:53 +04:00
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#include "nsCRT.h"
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2005-09-01 02:15:33 +04:00
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#include "nsPNGEncoder.h"
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#include "prmem.h"
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2007-04-25 09:56:53 +04:00
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#include "prprf.h"
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2005-09-01 02:15:33 +04:00
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#include "nsString.h"
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2006-01-02 05:30:32 +03:00
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#include "nsStreamUtils.h"
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2005-09-01 02:15:33 +04:00
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2007-03-23 02:01:14 +03:00
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// Bug 308126 - AIX defines jmpbuf in sys/context.h which conflicts with the
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// definition of jmpbuf in the png.h header file.
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#ifdef jmpbuf
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#undef jmpbuf
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#endif
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2006-01-02 05:30:32 +03:00
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// Input streams that do not implement nsIAsyncInputStream should be threadsafe
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// so that they may be used with nsIInputStreamPump and nsIInputStreamChannel,
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// which read such a stream on a background thread.
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NS_IMPL_THREADSAFE_ISUPPORTS2(nsPNGEncoder, imgIEncoder, nsIInputStream)
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2005-09-01 02:15:33 +04:00
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2007-04-25 09:56:53 +04:00
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nsPNGEncoder::nsPNGEncoder() : mPNG(nsnull), mPNGinfo(nsnull),
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mIsAnimation(PR_FALSE),
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mImageBuffer(nsnull), mImageBufferSize(0),
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mImageBufferUsed(0), mImageBufferReadPoint(0)
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2005-09-01 02:15:33 +04:00
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{
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}
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nsPNGEncoder::~nsPNGEncoder()
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{
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if (mImageBuffer) {
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PR_Free(mImageBuffer);
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mImageBuffer = nsnull;
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}
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2007-10-20 08:29:58 +04:00
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// don't leak if EndImageEncode wasn't called
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if (mPNG)
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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2005-09-01 02:15:33 +04:00
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}
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// nsPNGEncoder::InitFromData
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//
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// One output option is supported: "transparency=none" means that the
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// output PNG will not have an alpha channel, even if the input does.
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//
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// Based partially on gfx/cairo/cairo/src/cairo-png.c
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// See also modules/libimg/png/libpng.txt
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NS_IMETHODIMP nsPNGEncoder::InitFromData(const PRUint8* aData,
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PRUint32 aLength, // (unused, req'd by JS)
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PRUint32 aWidth,
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PRUint32 aHeight,
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PRUint32 aStride,
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PRUint32 aInputFormat,
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const nsAString& aOutputOptions)
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{
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2007-04-25 09:56:53 +04:00
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nsresult rv;
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rv = StartImageEncode(aWidth, aHeight, aInputFormat, aOutputOptions);
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if (!NS_SUCCEEDED(rv))
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return rv;
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rv = AddImageFrame(aData, aLength, aWidth, aHeight, aStride, aInputFormat, aOutputOptions);
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if (!NS_SUCCEEDED(rv))
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return rv;
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rv = EndImageEncode();
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return rv;
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}
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// nsPNGEncoder::StartImageEncode
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//
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//
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// See ::InitFromData for other info.
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NS_IMETHODIMP nsPNGEncoder::StartImageEncode(PRUint32 aWidth,
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PRUint32 aHeight,
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PRUint32 aInputFormat,
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const nsAString& aOutputOptions)
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{
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PRBool useTransparency = PR_TRUE, skipFirstFrame = PR_FALSE;
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PRUint32 numFrames = 1;
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PRUint32 numPlays = 0; // For animations, 0 == forever
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// can't initialize more than once
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if (mImageBuffer != nsnull)
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return NS_ERROR_ALREADY_INITIALIZED;
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2005-09-01 02:15:33 +04:00
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// validate input format
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if (aInputFormat != INPUT_FORMAT_RGB &&
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aInputFormat != INPUT_FORMAT_RGBA &&
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aInputFormat != INPUT_FORMAT_HOSTARGB)
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return NS_ERROR_INVALID_ARG;
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2007-04-25 09:56:53 +04:00
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// parse and check any provided output options
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nsresult rv = ParseOptions(aOutputOptions, &useTransparency, &skipFirstFrame,
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&numFrames, &numPlays, nsnull, nsnull,
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nsnull, nsnull, nsnull);
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if (rv != NS_OK) { return rv; }
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2005-09-01 02:15:33 +04:00
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2007-04-25 09:56:53 +04:00
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if (numFrames > 1) {
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mIsAnimation = PR_TRUE;
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2005-09-01 02:15:33 +04:00
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}
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// initialize
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2007-04-25 09:56:53 +04:00
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mPNG = png_create_write_struct(PNG_LIBPNG_VER_STRING,
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png_voidp_NULL,
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ErrorCallback,
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ErrorCallback);
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if (! mPNG)
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2005-09-01 02:15:33 +04:00
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return NS_ERROR_OUT_OF_MEMORY;
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2007-04-25 09:56:53 +04:00
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mPNGinfo = png_create_info_struct(mPNG);
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if (! mPNGinfo) {
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png_destroy_write_struct(&mPNG, nsnull);
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2005-09-01 02:15:33 +04:00
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return NS_ERROR_FAILURE;
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}
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2007-04-25 09:56:53 +04:00
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// libpng's error handler jumps back here upon an error.
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// Note: It's important that all png_* callers do this, or errors
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// will result in a corrupt time-warped stack.
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if (setjmp(png_jmpbuf(mPNG))) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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return NS_ERROR_FAILURE;
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2005-09-01 02:15:33 +04:00
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}
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// Set up to read the data into our image buffer, start out with an 8K
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// estimated size. Note: we don't have to worry about freeing this data
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// in this function. It will be freed on object destruction.
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mImageBufferSize = 8192;
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mImageBuffer = (PRUint8*)PR_Malloc(mImageBufferSize);
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if (!mImageBuffer) {
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2007-04-25 09:56:53 +04:00
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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2005-09-01 02:15:33 +04:00
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mImageBufferUsed = 0;
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// set our callback for libpng to give us the data
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2007-04-25 09:56:53 +04:00
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png_set_write_fn(mPNG, this, WriteCallback, NULL);
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2005-09-01 02:15:33 +04:00
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// include alpha?
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int colorType;
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if ((aInputFormat == INPUT_FORMAT_HOSTARGB ||
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aInputFormat == INPUT_FORMAT_RGBA) && useTransparency)
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colorType = PNG_COLOR_TYPE_RGB_ALPHA;
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else
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colorType = PNG_COLOR_TYPE_RGB;
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2007-04-25 09:56:53 +04:00
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png_set_IHDR(mPNG, mPNGinfo, aWidth, aHeight, 8, colorType,
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2005-09-01 02:15:33 +04:00
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
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PNG_FILTER_TYPE_DEFAULT);
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2007-04-25 09:56:53 +04:00
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if (mIsAnimation) {
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png_set_first_frame_is_hidden(mPNG, mPNGinfo, skipFirstFrame);
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png_set_acTL(mPNG, mPNGinfo, numFrames, numPlays);
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}
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// XXX: support PLTE, gAMA, tRNS, bKGD?
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png_write_info(mPNG, mPNGinfo);
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return NS_OK;
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}
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NS_IMETHODIMP nsPNGEncoder::AddImageFrame(const PRUint8* aData,
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PRUint32 aLength, // (unused, req'd by JS)
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PRUint32 aWidth,
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PRUint32 aHeight,
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PRUint32 aStride,
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PRUint32 aInputFormat,
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const nsAString& aFrameOptions)
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{
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PRBool useTransparency= PR_TRUE;
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PRUint32 delay_ms = 500;
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PRUint32 dispose_op = PNG_DISPOSE_OP_NONE;
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PRUint32 blend_op = PNG_BLEND_OP_SOURCE;
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PRUint32 x_offset = 0, y_offset = 0;
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// must be initialized
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if (mImageBuffer == nsnull)
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return NS_ERROR_NOT_INITIALIZED;
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2007-10-20 08:29:58 +04:00
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// EndImageEncode was done, or some error occurred earlier
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if (!mPNG)
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return NS_BASE_STREAM_CLOSED;
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2007-04-25 09:56:53 +04:00
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// validate input format
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if (aInputFormat != INPUT_FORMAT_RGB &&
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aInputFormat != INPUT_FORMAT_RGBA &&
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aInputFormat != INPUT_FORMAT_HOSTARGB)
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return NS_ERROR_INVALID_ARG;
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// libpng's error handler jumps back here upon an error.
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if (setjmp(png_jmpbuf(mPNG))) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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return NS_ERROR_FAILURE;
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}
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// parse and check any provided output options
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nsresult rv = ParseOptions(aFrameOptions, &useTransparency, nsnull,
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nsnull, nsnull, &dispose_op, &blend_op,
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&delay_ms, &x_offset, &y_offset);
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if (rv != NS_OK) { return rv; }
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if (mIsAnimation) {
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// XXX the row pointers arg (#3) is unused, can it be removed?
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png_write_frame_head(mPNG, mPNGinfo, nsnull,
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aWidth, aHeight, x_offset, y_offset,
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delay_ms, 1000, dispose_op, blend_op);
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}
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// Stride is the padded width of each row, so it better be longer (I'm afraid
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// people will not understand what stride means, so check it well)
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if ((aInputFormat == INPUT_FORMAT_RGB &&
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aStride < aWidth * 3) ||
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((aInputFormat == INPUT_FORMAT_RGBA || aInputFormat == INPUT_FORMAT_HOSTARGB) &&
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aStride < aWidth * 4)) {
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NS_WARNING("Invalid stride for InitFromData/AddImageFrame");
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return NS_ERROR_INVALID_ARG;
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}
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2005-09-01 02:15:33 +04:00
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// write each row: if we add more input formats, we may want to
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// generalize the conversions
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if (aInputFormat == INPUT_FORMAT_HOSTARGB) {
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// PNG requires RGBA with post-multiplied alpha, so we need to convert
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PRUint8* row = new PRUint8[aWidth * 4];
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for (PRUint32 y = 0; y < aHeight; y ++) {
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ConvertHostARGBRow(&aData[y * aStride], row, aWidth, useTransparency);
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2007-04-25 09:56:53 +04:00
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png_write_row(mPNG, row);
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2005-09-01 02:15:33 +04:00
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}
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delete[] row;
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} else if (aInputFormat == INPUT_FORMAT_RGBA && ! useTransparency) {
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// RBGA, but we need to strip the alpha
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PRUint8* row = new PRUint8[aWidth * 4];
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for (PRUint32 y = 0; y < aHeight; y ++) {
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StripAlpha(&aData[y * aStride], row, aWidth);
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2007-04-25 09:56:53 +04:00
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png_write_row(mPNG, row);
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2005-09-01 02:15:33 +04:00
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}
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delete[] row;
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} else if (aInputFormat == INPUT_FORMAT_RGB ||
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aInputFormat == INPUT_FORMAT_RGBA) {
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// simple RBG(A), no conversion needed
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for (PRUint32 y = 0; y < aHeight; y ++) {
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2007-04-25 09:56:53 +04:00
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png_write_row(mPNG, (PRUint8*)&aData[y * aStride]);
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2005-09-01 02:15:33 +04:00
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}
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} else {
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NS_NOTREACHED("Bad format type");
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2007-04-25 09:56:53 +04:00
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return NS_ERROR_INVALID_ARG;
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}
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if (mIsAnimation) {
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png_write_frame_tail(mPNG, mPNGinfo);
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2007-04-25 09:56:54 +04:00
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}
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2007-04-25 09:56:53 +04:00
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return NS_OK;
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}
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NS_IMETHODIMP nsPNGEncoder::EndImageEncode()
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{
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// must be initialized
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if (mImageBuffer == nsnull)
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return NS_ERROR_NOT_INITIALIZED;
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2007-10-20 08:29:58 +04:00
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// EndImageEncode has already been called, or some error occurred earlier
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if (!mPNG)
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return NS_BASE_STREAM_CLOSED;
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2007-04-25 09:56:53 +04:00
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// libpng's error handler jumps back here upon an error.
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if (setjmp(png_jmpbuf(mPNG))) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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return NS_ERROR_FAILURE;
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}
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png_write_end(mPNG, mPNGinfo);
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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2005-09-01 02:15:33 +04:00
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// if output callback can't get enough memory, it will free our buffer
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2006-01-02 05:30:32 +03:00
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if (!mImageBuffer)
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2005-09-01 02:15:33 +04:00
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|
|
return NS_ERROR_OUT_OF_MEMORY;
|
2006-01-02 05:30:32 +03:00
|
|
|
|
|
|
|
return NS_OK;
|
2005-09-01 02:15:33 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-04-25 09:56:53 +04:00
|
|
|
nsresult
|
|
|
|
nsPNGEncoder::ParseOptions(const nsAString& aOptions,
|
|
|
|
PRBool* useTransparency,
|
|
|
|
PRBool* skipFirstFrame,
|
|
|
|
PRUint32* numFrames,
|
|
|
|
PRUint32* numPlays,
|
|
|
|
PRUint32* frameDispose,
|
|
|
|
PRUint32* frameBlend,
|
|
|
|
PRUint32* frameDelay,
|
|
|
|
PRUint32* offsetX,
|
|
|
|
PRUint32* offsetY)
|
|
|
|
{
|
|
|
|
char* token;
|
|
|
|
char* options = nsCRT::strdup(PromiseFlatCString(NS_ConvertUTF16toUTF8(aOptions)).get());
|
|
|
|
|
|
|
|
while ((token = nsCRT::strtok(options, ";", &options))) {
|
|
|
|
// If there's an '=' character, split the token around it.
|
|
|
|
char* equals = token, *value = nsnull;
|
|
|
|
while(*equals != '=' && *equals) { ++equals; }
|
|
|
|
if (*equals == '=') { value = equals + 1; }
|
|
|
|
|
|
|
|
if (value) { *equals = '\0'; } // temporary null
|
|
|
|
|
|
|
|
// transparency=[yes|no|none]
|
|
|
|
if (nsCRT::strcmp(token, "transparency") == 0 && useTransparency) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (nsCRT::strcmp(value, "none") == 0 || nsCRT::strcmp(value, "no") == 0) {
|
|
|
|
*useTransparency = PR_FALSE;
|
|
|
|
} else if (nsCRT::strcmp(value, "yes") == 0) {
|
|
|
|
*useTransparency = PR_TRUE;
|
|
|
|
} else {
|
|
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
}
|
|
|
|
|
|
|
|
// skipfirstframe=[yes|no]
|
|
|
|
} else if (nsCRT::strcmp(token, "skipfirstframe") == 0 && skipFirstFrame) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (nsCRT::strcmp(value, "no") == 0) {
|
|
|
|
*skipFirstFrame = PR_FALSE;
|
|
|
|
} else if (nsCRT::strcmp(value, "yes") == 0) {
|
|
|
|
*skipFirstFrame = PR_TRUE;
|
|
|
|
} else {
|
|
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
}
|
|
|
|
|
|
|
|
// frames=#
|
|
|
|
} else if (nsCRT::strcmp(token, "frames") == 0 && numFrames) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (PR_sscanf(value, "%u", numFrames) != 1) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
// frames=0 is nonsense.
|
|
|
|
if (*numFrames == 0) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
// plays=#
|
|
|
|
} else if (nsCRT::strcmp(token, "plays") == 0 && numPlays) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
// plays=0 to loop forever, otherwise play sequence specified number of times
|
|
|
|
if (PR_sscanf(value, "%u", numPlays) != 1) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
// dispose=[none|background|previous]
|
|
|
|
} else if (nsCRT::strcmp(token, "dispose") == 0 && frameDispose) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (nsCRT::strcmp(value, "none") == 0) {
|
|
|
|
*frameDispose = PNG_DISPOSE_OP_NONE;
|
|
|
|
} else if (nsCRT::strcmp(value, "background") == 0) {
|
|
|
|
*frameDispose = PNG_DISPOSE_OP_BACKGROUND;
|
|
|
|
} else if (nsCRT::strcmp(value, "previous") == 0) {
|
|
|
|
*frameDispose = PNG_DISPOSE_OP_PREVIOUS;
|
|
|
|
} else {
|
|
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
}
|
|
|
|
|
|
|
|
// blend=[source|over]
|
|
|
|
} else if (nsCRT::strcmp(token, "blend") == 0 && frameBlend) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (nsCRT::strcmp(value, "source") == 0) {
|
|
|
|
*frameBlend = PNG_BLEND_OP_SOURCE;
|
|
|
|
} else if (nsCRT::strcmp(value, "over") == 0) {
|
|
|
|
*frameBlend = PNG_BLEND_OP_OVER;
|
|
|
|
} else {
|
|
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
}
|
|
|
|
|
|
|
|
// delay=# (in ms)
|
|
|
|
} else if (nsCRT::strcmp(token, "delay") == 0 && frameDelay) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (PR_sscanf(value, "%u", frameDelay) != 1) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
// xoffset=#
|
|
|
|
} else if (nsCRT::strcmp(token, "xoffset") == 0 && offsetX) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (PR_sscanf(value, "%u", offsetX) != 1) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
// yoffset=#
|
|
|
|
} else if (nsCRT::strcmp(token, "yoffset") == 0 && offsetY) {
|
|
|
|
if (!value) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
if (PR_sscanf(value, "%u", offsetY) != 1) { return NS_ERROR_INVALID_ARG; }
|
|
|
|
|
|
|
|
// unknown token name
|
|
|
|
} else {
|
|
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (value) { *equals = '='; } // restore '=' so strtok doesn't get lost
|
|
|
|
}
|
|
|
|
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-09-01 02:15:33 +04:00
|
|
|
/* void close (); */
|
|
|
|
NS_IMETHODIMP nsPNGEncoder::Close()
|
|
|
|
{
|
|
|
|
if (mImageBuffer != nsnull) {
|
|
|
|
PR_Free(mImageBuffer);
|
|
|
|
mImageBuffer = nsnull;
|
|
|
|
mImageBufferSize = 0;
|
|
|
|
mImageBufferUsed = 0;
|
2006-01-02 05:30:32 +03:00
|
|
|
mImageBufferReadPoint = 0;
|
2005-09-01 02:15:33 +04:00
|
|
|
}
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* unsigned long available (); */
|
|
|
|
NS_IMETHODIMP nsPNGEncoder::Available(PRUint32 *_retval)
|
|
|
|
{
|
2006-01-02 05:30:32 +03:00
|
|
|
if (!mImageBuffer)
|
|
|
|
return NS_BASE_STREAM_CLOSED;
|
|
|
|
|
2005-09-01 02:15:33 +04:00
|
|
|
*_retval = mImageBufferUsed - mImageBufferReadPoint;
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* [noscript] unsigned long read (in charPtr aBuf, in unsigned long aCount); */
|
2006-01-02 05:30:32 +03:00
|
|
|
NS_IMETHODIMP nsPNGEncoder::Read(char * aBuf, PRUint32 aCount,
|
|
|
|
PRUint32 *_retval)
|
2005-09-01 02:15:33 +04:00
|
|
|
{
|
2006-01-02 05:30:32 +03:00
|
|
|
return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, _retval);
|
2005-09-01 02:15:33 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
/* [noscript] unsigned long readSegments (in nsWriteSegmentFun aWriter, in voidPtr aClosure, in unsigned long aCount); */
|
2006-01-02 05:30:32 +03:00
|
|
|
NS_IMETHODIMP nsPNGEncoder::ReadSegments(nsWriteSegmentFun aWriter,
|
|
|
|
void *aClosure, PRUint32 aCount,
|
|
|
|
PRUint32 *_retval)
|
2005-09-01 02:15:33 +04:00
|
|
|
{
|
2006-01-02 05:30:32 +03:00
|
|
|
PRUint32 maxCount = mImageBufferUsed - mImageBufferReadPoint;
|
|
|
|
if (maxCount == 0) {
|
|
|
|
*_retval = 0;
|
|
|
|
return NS_OK;
|
|
|
|
}
|
2005-09-01 02:15:33 +04:00
|
|
|
|
2006-01-02 05:30:32 +03:00
|
|
|
if (aCount > maxCount)
|
|
|
|
aCount = maxCount;
|
|
|
|
nsresult rv = aWriter(this, aClosure,
|
2007-07-08 11:08:04 +04:00
|
|
|
reinterpret_cast<const char*>(mImageBuffer),
|
2008-04-02 03:20:12 +04:00
|
|
|
0, aCount, _retval);
|
2006-01-02 05:30:32 +03:00
|
|
|
if (NS_SUCCEEDED(rv)) {
|
|
|
|
NS_ASSERTION(*_retval <= aCount, "bad write count");
|
|
|
|
mImageBufferReadPoint += *_retval;
|
|
|
|
}
|
2005-09-01 02:15:33 +04:00
|
|
|
|
2006-01-02 05:30:32 +03:00
|
|
|
// errors returned from the writer end here!
|
|
|
|
return NS_OK;
|
2005-09-01 02:15:33 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
/* boolean isNonBlocking (); */
|
|
|
|
NS_IMETHODIMP nsPNGEncoder::IsNonBlocking(PRBool *_retval)
|
|
|
|
{
|
2006-01-02 05:30:32 +03:00
|
|
|
*_retval = PR_FALSE; // We don't implement nsIAsyncInputStream
|
2005-09-01 02:15:33 +04:00
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// nsPNGEncoder::ConvertHostARGBRow
|
|
|
|
//
|
|
|
|
// Our colors are stored with premultiplied alphas, but PNGs use
|
|
|
|
// post-multiplied alpha. This swaps to PNG-style alpha.
|
|
|
|
//
|
|
|
|
// Copied from gfx/cairo/cairo/src/cairo-png.c
|
|
|
|
|
|
|
|
void
|
|
|
|
nsPNGEncoder::ConvertHostARGBRow(const PRUint8* aSrc, PRUint8* aDest,
|
|
|
|
PRUint32 aPixelWidth, PRBool aUseTransparency)
|
|
|
|
{
|
|
|
|
PRUint32 pixelStride = aUseTransparency ? 4 : 3;
|
|
|
|
for (PRUint32 x = 0; x < aPixelWidth; x ++) {
|
|
|
|
const PRUint32& pixelIn = ((const PRUint32*)(aSrc))[x];
|
|
|
|
PRUint8 *pixelOut = &aDest[x * pixelStride];
|
|
|
|
|
|
|
|
PRUint8 alpha = (pixelIn & 0xff000000) >> 24;
|
|
|
|
if (alpha == 0) {
|
|
|
|
pixelOut[0] = pixelOut[1] = pixelOut[2] = pixelOut[3] = 0;
|
|
|
|
} else {
|
|
|
|
pixelOut[0] = (((pixelIn & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
|
|
|
|
pixelOut[1] = (((pixelIn & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
|
|
|
|
pixelOut[2] = (((pixelIn & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
|
|
|
|
if (aUseTransparency)
|
|
|
|
pixelOut[3] = alpha;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// nsPNGEncoder::StripAlpha
|
|
|
|
//
|
|
|
|
// Input is RGBA, output is RGB
|
|
|
|
|
|
|
|
void
|
|
|
|
nsPNGEncoder::StripAlpha(const PRUint8* aSrc, PRUint8* aDest,
|
|
|
|
PRUint32 aPixelWidth)
|
|
|
|
{
|
|
|
|
for (PRUint32 x = 0; x < aPixelWidth; x ++) {
|
|
|
|
const PRUint8* pixelIn = &aSrc[x * 4];
|
|
|
|
PRUint8* pixelOut = &aDest[x * 3];
|
|
|
|
pixelOut[0] = pixelIn[0];
|
|
|
|
pixelOut[1] = pixelIn[1];
|
|
|
|
pixelOut[2] = pixelIn[2];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-04-25 09:56:53 +04:00
|
|
|
// nsPNGEncoder::ErrorCallback
|
|
|
|
|
|
|
|
void // static
|
|
|
|
nsPNGEncoder::ErrorCallback(png_structp png_ptr, png_const_charp warning_msg)
|
|
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
|
|
// XXX: these messages are probably useful callers... use nsIConsoleService?
|
|
|
|
PR_fprintf(PR_STDERR, "PNG Encoder: %s\n", warning_msg);;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-09-01 02:15:33 +04:00
|
|
|
// nsPNGEncoder::WriteCallback
|
|
|
|
|
|
|
|
void // static
|
|
|
|
nsPNGEncoder::WriteCallback(png_structp png, png_bytep data, png_size_t size)
|
|
|
|
{
|
2007-07-08 11:08:04 +04:00
|
|
|
nsPNGEncoder* that = static_cast<nsPNGEncoder*>(png_get_io_ptr(png));
|
2005-09-01 02:15:33 +04:00
|
|
|
if (! that->mImageBuffer)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (that->mImageBufferUsed + size > that->mImageBufferSize) {
|
|
|
|
// expand buffer, just double each time
|
|
|
|
that->mImageBufferSize *= 2;
|
|
|
|
PRUint8* newBuf = (PRUint8*)PR_Realloc(that->mImageBuffer,
|
|
|
|
that->mImageBufferSize);
|
|
|
|
if (! newBuf) {
|
|
|
|
// can't resize, just zero (this will keep us from writing more)
|
|
|
|
PR_Free(that->mImageBuffer);
|
|
|
|
that->mImageBufferSize = 0;
|
|
|
|
that->mImageBufferUsed = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
that->mImageBuffer = newBuf;
|
|
|
|
}
|
|
|
|
memcpy(&that->mImageBuffer[that->mImageBufferUsed], data, size);
|
|
|
|
that->mImageBufferUsed += size;
|
|
|
|
}
|