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gecko-dev/modules/libimg/pngcom/ipng.cpp

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14 KiB
C++
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 03/27/2000 IBM Corp. Added PR_CALLBACK for Optlink
* use in OS2
*/
#include "png.h"
#include "nsIImgDecoder.h" // include if_struct.h Needs to be first
#include "ipng.h"
#include "pngdec.h"
#include "nsPNGDecoder.h"
#include "nsIImgDCallbk.h"
#include "ilISystemServices.h"
#define MINIMUM_DELAY_TIME 10
static void PR_CALLBACK info_callback(png_structp png_ptr, png_infop info);
static void PR_CALLBACK row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass);
static void PR_CALLBACK end_callback(png_structp png_ptr, png_infop info);
static void PR_CALLBACK il_png_error_handler(png_structp png_ptr, png_const_charp msg);
int il_debug;
PRLogModuleInfo *il_log_module = NULL;
#define CAN_SUPPORT_8_BIT_MASK
PRBool
il_png_init(il_container *ic)
{
ipng_struct *ipng_p;
NI_ColorSpace *src_color_space = ic->src_header->color_space;
ic->image->header.width = ic->dest_width;
ic->image->header.height = ic->dest_height;
ipng_p = PR_NEWZAP(ipng_struct);
if (!ipng_p)
return PR_FALSE;
ic->ds = ipng_p;
ipng_p->state = PNG_INIT;
ipng_p->ic = ic;
/* Initialize the container's source image header. */
/* Always decode to 24 bit pixdepth */
src_color_space->type = NI_TrueColor;
src_color_space->pixmap_depth = 24;
src_color_space->bit_alloc.index_depth = 0;
png_structp png_ptr;
png_infop info_ptr;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, ipng_p,
il_png_error_handler, NULL);
if (png_ptr == NULL) {
ipng_p->pngs_p = NULL;
ipng_p->info_p = NULL;
ipng_p->state = PNG_ERROR;
return -1;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
ipng_p->pngs_p = NULL;
ipng_p->info_p = NULL;
ipng_p->state = PNG_ERROR;
return -1;
}
ipng_p->pngs_p = png_ptr;
ipng_p->info_p = info_ptr;
/* use ic as libpng "progressive pointer" (retrieve in callbacks) */
png_set_progressive_read_fn(png_ptr, (void *)ic, info_callback,
row_callback, end_callback);
return PR_TRUE;
}
/* Gather n characters from the input stream and then enter state s. */
int
il_png_write(il_container *ic, const unsigned char *buf, int32 len)
{
ipng_structp ipng_p;
PR_ASSERT(ic != NULL);
ipng_p = (ipng_structp)ic->ds;
if (ipng_p->state == PNG_ERROR)
return -1;
if (setjmp(ipng_p->jmpbuf)) {
png_destroy_read_struct(&ipng_p->pngs_p, &ipng_p->info_p, NULL);
ipng_p->state = PNG_ERROR;
return -1;
}
png_process_data(ipng_p->pngs_p, ipng_p->info_p, (unsigned char *)buf, len);
ipng_p->state = PNG_CONTINUE;
return 0;
}
int
il_png_complete(il_container *ic)
{
/* notify observers that the current frame has completed. */
ic->imgdcb->ImgDCBHaveImageAll();
return 0;
}
int
il_png_abort(il_container *ic)
{
if (ic->ds) {
ipng_structp ipng_p = (ipng_structp)ic->ds;
PR_FREEIF(ipng_p->rgbrow);
PR_FREEIF(ipng_p->alpharow);
PR_FREEIF(ipng_p->interlacebuf);
ipng_p->rgbrow = NULL;
ipng_p->alpharow = NULL;
ipng_p->interlacebuf = NULL;
if((ipng_p->pngs_p)&&(ipng_p->info_p))
png_destroy_read_struct(&ipng_p->pngs_p, &ipng_p->info_p, NULL);
PR_FREEIF(ipng_p);
ic->ds = NULL;
}
/* il_abort( ic ); */
return 0;
}
/*---------------------------------------------------------------------------
Former contents of png_png.cpp, a.k.a. libpng's example.c (modified):
---------------------------------------------------------------------------*/
static void
info_callback(png_structp png_ptr, png_infop info_ptr)
{
/* int number_passes; NOT USED */
png_uint_32 width, height;
int bit_depth, color_type, interlace_type, compression_type, filter_type;
int channels;
double LUT_exponent, CRT_exponent = 2.2, display_exponent, aGamma;
il_container *ic;
ipng_structp ipng_p;
NI_PixmapHeader *img_hdr;
NI_PixmapHeader *src_hdr;
png_bytep trans=NULL;
int num_trans =0;
/* always decode to 24-bit RGB or 32-bit RGBA */
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
&interlace_type, &compression_type, &filter_type);
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
{
png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, NULL);
png_set_expand(png_ptr);
}
if (bit_depth == 16)
png_set_strip_16(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
/* set up gamma correction for Mac, Unix and (Win32 and everything else)
* using educated guesses for display-system exponents; do preferences
* later */
#if defined(XP_MAC)
LUT_exponent = 1.8 / 2.61;
#elif defined(XP_UNIX)
# if defined(__sgi)
LUT_exponent = 1.0 / 1.7; /* typical default for SGI console */
# elif defined(NeXT)
LUT_exponent = 1.0 / 2.2; /* typical default for NeXT cube */
# else
LUT_exponent = 1.0; /* default for most other Unix workstations */
# endif
#else
LUT_exponent = 1.0; /* virtually all PCs and most other systems */
#endif
/* (alternatively, could check for SCREEN_GAMMA environment variable) */
display_exponent = LUT_exponent * CRT_exponent;
if (png_get_gAMA(png_ptr, info_ptr, &aGamma))
png_set_gamma(png_ptr, display_exponent, aGamma);
else
png_set_gamma(png_ptr, display_exponent, 0.45455);
/* let libpng expand interlaced images */
if (interlace_type == PNG_INTERLACE_ADAM7)
/* number_passes = */ png_set_interlace_handling(png_ptr);
/* now all of those things we set above are used to update various struct
* members and whatnot, after which we can get channels, rowbytes, etc. */
png_read_update_info(png_ptr, info_ptr);
channels = png_get_channels(png_ptr, info_ptr);
PR_ASSERT(channels == 3 || channels == 4);
/* set the ic values */
ic = (il_container *)png_get_progressive_ptr(png_ptr);
PR_ASSERT(ic != NULL);
/*---------------------------------------------------------------*/
/* copy PNG info into imagelib structs (formerly png_set_dims()) */
/*---------------------------------------------------------------*/
ipng_p = (ipng_structp)ic->ds;
img_hdr = &ic->image->header;
src_hdr = ic->src_header;
ipng_p->width = src_hdr->width = width;
ipng_p->height = src_hdr->height = height;
ipng_p->channels = channels;
PR_ASSERT(ipng_p->rgbrow == NULL);
PR_ASSERT(ipng_p->alpharow == NULL);
ipng_p->rgbrow = (PRUint8 *)PR_MALLOC(channels*width);
if (!ipng_p->rgbrow) {
ILTRACE(0, ("il:png: MEM row"));
ipng_p->state = PNG_ERROR;
return;
}
if(interlace_type == PNG_INTERLACE_ADAM7) {
ipng_p->interlacebuf = (PRUint8 *)PR_MALLOC(channels*width*height);
if (!ipng_p->interlacebuf) {
ILTRACE(0, ("il:png: MEM interlacebuf"));
ipng_p->state = PNG_ERROR;
return;
}
}
else
ipng_p->interlacebuf = NULL;
if (channels > 3) {
ipng_p->alpharow = NULL;
#if defined(CAN_SUPPORT_8_BIT_MASK)
if (color_type || PNG_COLOR_MASK_ALPHA) {
/* check if alpha is coming from a tRNS chunk and is binary */
if (num_trans) {
ic->image->header.alpha_bits = 1;
/* if it's not a indexed color image, tRNS means binary */
if (color_type == PNG_COLOR_TYPE_PALETTE)
for (int i=0; i<num_trans; i++)
if ((trans[i] != 0) && (trans[i] != 255)) {
ic->image->header.alpha_bits = 8;
break;
}
} else
ic->image->header.alpha_bits = 8/*png_ptr->pixel_depth*/; /* 8 */
} else
#endif
ic->image->header.alpha_bits = 1;
ic->image->header.alpha_shift = 0;
ic->image->header.is_interleaved_alpha = PR_TRUE;
}
ic->imgdcb->ImgDCBImageSize();
/* Note: all PNGs are decoded to RGB or RGBA and
converted by imglib to appropriate pixel depth */
ic->imgdcb->ImgDCBSetupColorspaceConverter();
return;
}
static void
row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass)
{
/* libpng comments:
*
* this function is called for every row in the image. If the
* image is interlacing, and you turned on the interlace handler,
* this function will be called for every row in every pass.
* Some of these rows will not be changed from the previous pass.
* When the row is not changed, the new_row variable will be NULL.
* The rows and passes are called in order, so you don't really
* need the row_num and pass, but I'm supplying them because it
* may make your life easier.
*
* For the non-NULL rows of interlaced images, you must call
* png_progressive_combine_row() passing in the row and the
* old row. You can call this function for NULL rows (it will
* just return) and for non-interlaced images (it just does the
* memcpy for you) if it will make the code easier. Thus, you
* can just do this for all cases:
*
* png_progressive_combine_row(png_ptr, old_row, new_row);
*
* where old_row is what was displayed for previous rows. Note
* that the first pass (pass == 0 really) will completely cover
* the old row, so the rows do not have to be initialized. After
* the first pass (and only for interlaced images), you will have
* to pass the current row, and the function will combine the
* old row and the new row.
*/
il_container *ic = (il_container *)png_get_progressive_ptr(png_ptr);
ipng_structp ipng_p = (ipng_structp)ic->ds;
PR_ASSERT(ipng_p);
int bw = ipng_p->channels * ipng_p->width;
png_bytep line;
if(ipng_p->interlacebuf)
{
line = ipng_p->interlacebuf+row_num*bw;
png_progressive_combine_row(png_ptr, line, new_row);
}
else
line = new_row;
if (new_row) {
/* first we copy the row data to a different buffer so that
* il_emit_row() in scale.cpp doesn't mess up libpng's row buffer
*/
memcpy(ipng_p->rgbrow, line, bw);
ic->imgdcb->ImgDCBHaveRow(0, ipng_p->rgbrow, 0, ipng_p->width,
row_num, 1, ilErase /* ilOverlay */, pass);
}
}
static void
end_callback(png_structp png_ptr, png_infop info_ptr)
{
/* libpng comments:
*
* this function is called when the whole image has been read,
* including any chunks after the image (up to and including
* the IEND). You will usually have the same info chunk as you
* had in the header, although some data may have been added
* to the comments and time fields.
*
* Most people won't do much here, perhaps setting a flag that
* marks the image as finished.
*/
il_container *ic = (il_container *)png_get_progressive_ptr(png_ptr);
ic->imgdcb->ImgDCBFlushImage();
}
static void
il_png_error_handler(png_structp png_ptr, png_const_charp msg)
{
ipng_structp ipng_p;
/* This function, aside from the extra step of retrieving the "error
* pointer" (below) and the fact that it exists within the application
* rather than within libpng, is essentially identical to libpng's
* default error handler. The second point is critical: since both
* setjmp() and longjmp() are called from the same code, they are
* guaranteed to have compatible notions of how big a jmp_buf is,
* regardless of whether _BSD_SOURCE or anything else has (or has not)
* been defined. Adapted from readpng2_error_handler() in "PNG: The
* Definitive Guide" (O'Reilly, 1999). */
fprintf(stderr, "nspng libpng error: %s\n", msg);
fflush(stderr);
ipng_p = (ipng_structp)png_get_error_ptr(png_ptr);
if (ipng_p == NULL) { /* we are completely hosed now */
fprintf(stderr, "nspng severe error: jmpbuf not recoverable.\n");
fflush(stderr);
PR_ASSERT(ipng_p != NULL); /* instead of exit(99); */
}
longjmp(ipng_p->jmpbuf, 1);
}
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