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netsurf/image/jpeg.c
Vincent Sanders c105738fa3 Change LOG() macro to be varadic
This changes the LOG macro to be varadic removing the need for all
callsites to have double bracketing and allows for future improvement
on how we use the logging macros.

The callsites were changed with coccinelle and the changes checked by
hand. Compile tested for several frontends but not all.

A formatting annotation has also been added which allows the compiler
to check the parameters and types passed to the logging.
2015-05-28 16:08:46 +01:00

393 lines
9.7 KiB
C

/*
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
* Copyright 2004 John M Bell <jmb202@ecs.soton.ac.uk>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* Content for image/jpeg (implementation).
*
* This implementation uses the IJG JPEG library.
*/
#include <stdbool.h>
#include <stdlib.h>
#include <setjmp.h>
#include "utils/log.h"
#include "utils/messages.h"
#include "content/content_protected.h"
#include "desktop/gui_internal.h"
#include "image/image_cache.h"
#include "image/bitmap.h"
#define JPEG_INTERNAL_OPTIONS
#include "jpeglib.h"
#include "image/jpeg.h"
/** absolute minimum size of a jpeg below which it is not even worth
* trying to read header data
*/
#define MIN_JPEG_SIZE 20
#ifdef riscos
/* We prefer the library to be configured with these options to save
* copying data during decoding. */
#if RGB_RED != 0 || RGB_GREEN != 1 || RGB_BLUE != 2 || RGB_PIXELSIZE != 4
#warning JPEG library not optimally configured. Decoding will be slower.
#endif
/* but we don't care if we're not on RISC OS */
#endif
static char nsjpeg_error_buffer[JMSG_LENGTH_MAX];
static unsigned char nsjpeg_eoi[] = { 0xff, JPEG_EOI };
/**
* Content create entry point.
*/
static nserror nsjpeg_create(const content_handler *handler,
lwc_string *imime_type, const http_parameter *params,
llcache_handle *llcache, const char *fallback_charset,
bool quirks, struct content **c)
{
struct content *jpeg;
nserror error;
jpeg = calloc(1, sizeof(struct content));
if (jpeg == NULL)
return NSERROR_NOMEM;
error = content__init(jpeg, handler, imime_type, params,
llcache, fallback_charset, quirks);
if (error != NSERROR_OK) {
free(jpeg);
return error;
}
*c = jpeg;
return NSERROR_OK;
}
/**
* JPEG data source manager: initialize source.
*/
static void nsjpeg_init_source(j_decompress_ptr cinfo)
{
}
/**
* JPEG data source manager: fill the input buffer.
*
* This can only occur if the JPEG data was truncated or corrupted. Insert a
* fake EOI marker to allow the decompressor to output as much as possible.
*/
static boolean nsjpeg_fill_input_buffer(j_decompress_ptr cinfo)
{
cinfo->src->next_input_byte = nsjpeg_eoi;
cinfo->src->bytes_in_buffer = 2;
return TRUE;
}
/**
* JPEG data source manager: skip num_bytes worth of data.
*/
static void nsjpeg_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
if ((long) cinfo->src->bytes_in_buffer < num_bytes) {
cinfo->src->next_input_byte = 0;
cinfo->src->bytes_in_buffer = 0;
} else {
cinfo->src->next_input_byte += num_bytes;
cinfo->src->bytes_in_buffer -= num_bytes;
}
}
/**
* JPEG data source manager: terminate source.
*/
static void nsjpeg_term_source(j_decompress_ptr cinfo)
{
}
/**
* Error output handler for JPEG library.
*
* This logs to NetSurf log instead of stderr.
* Warnings only - fatal errors are trapped by nsjpeg_error_exit
* and do not call the output handler.
*/
static void nsjpeg_error_log(j_common_ptr cinfo)
{
cinfo->err->format_message(cinfo, nsjpeg_error_buffer);
LOG("%s", nsjpeg_error_buffer);
}
/**
* Fatal error handler for JPEG library.
*
* This prevents jpeglib calling exit() on a fatal error.
*/
static void nsjpeg_error_exit(j_common_ptr cinfo)
{
jmp_buf *setjmp_buffer = (jmp_buf *) cinfo->client_data;
cinfo->err->format_message(cinfo, nsjpeg_error_buffer);
LOG("%s", nsjpeg_error_buffer);
longjmp(*setjmp_buffer, 1);
}
static struct bitmap *
jpeg_cache_convert(struct content *c)
{
uint8_t *source_data; /* Jpeg source data */
unsigned long source_size; /* length of Jpeg source data */
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
jmp_buf setjmp_buffer;
unsigned int height;
unsigned int width;
struct bitmap * volatile bitmap = NULL;
uint8_t * volatile pixels = NULL;
size_t rowstride;
struct jpeg_source_mgr source_mgr = {
0,
0,
nsjpeg_init_source,
nsjpeg_fill_input_buffer,
nsjpeg_skip_input_data,
jpeg_resync_to_restart,
nsjpeg_term_source };
/* obtain jpeg source data and perfom minimal sanity checks */
source_data = (uint8_t *)content__get_source_data(c, &source_size);
if ((source_data == NULL) ||
(source_size < MIN_JPEG_SIZE)) {
return NULL;
}
/* setup a JPEG library error handler */
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = nsjpeg_error_exit;
jerr.output_message = nsjpeg_error_log;
/* handler for fatal errors during decompression */
if (setjmp(setjmp_buffer)) {
jpeg_destroy_decompress(&cinfo);
return bitmap;
}
jpeg_create_decompress(&cinfo);
cinfo.client_data = &setjmp_buffer;
/* setup data source */
source_mgr.next_input_byte = source_data;
source_mgr.bytes_in_buffer = source_size;
cinfo.src = &source_mgr;
/* read JPEG header information */
jpeg_read_header(&cinfo, TRUE);
/* set output processing parameters */
cinfo.out_color_space = JCS_RGB;
cinfo.dct_method = JDCT_ISLOW;
/* commence the decompression, output parameters now valid */
jpeg_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
/* create opaque bitmap (jpegs cannot be transparent) */
bitmap = guit->bitmap->create(width, height, BITMAP_NEW | BITMAP_OPAQUE);
if (bitmap == NULL) {
/* empty bitmap could not be created */
jpeg_destroy_decompress(&cinfo);
return NULL;
}
pixels = guit->bitmap->get_buffer(bitmap);
if (pixels == NULL) {
/* bitmap with no buffer available */
guit->bitmap->destroy(bitmap);
jpeg_destroy_decompress(&cinfo);
return NULL;
}
/* Convert scanlines from jpeg into bitmap */
rowstride = guit->bitmap->get_rowstride(bitmap);
do {
JSAMPROW scanlines[1];
scanlines[0] = (JSAMPROW) (pixels +
rowstride * cinfo.output_scanline);
jpeg_read_scanlines(&cinfo, scanlines, 1);
#if RGB_RED != 0 || RGB_GREEN != 1 || RGB_BLUE != 2 || RGB_PIXELSIZE != 4
{
/* Missmatch between configured libjpeg pixel format and
* NetSurf pixel format. Convert to RGBA */
int i;
for (i = width - 1; 0 <= i; i--) {
int r = scanlines[0][i * RGB_PIXELSIZE + RGB_RED];
int g = scanlines[0][i * RGB_PIXELSIZE + RGB_GREEN];
int b = scanlines[0][i * RGB_PIXELSIZE + RGB_BLUE];
scanlines[0][i * 4 + 0] = r;
scanlines[0][i * 4 + 1] = g;
scanlines[0][i * 4 + 2] = b;
scanlines[0][i * 4 + 3] = 0xff;
}
}
#endif
} while (cinfo.output_scanline != cinfo.output_height);
guit->bitmap->modified(bitmap);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return bitmap;
}
/**
* Convert a CONTENT_JPEG for display.
*/
static bool nsjpeg_convert(struct content *c)
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
jmp_buf setjmp_buffer;
struct jpeg_source_mgr source_mgr = { 0, 0,
nsjpeg_init_source, nsjpeg_fill_input_buffer,
nsjpeg_skip_input_data, jpeg_resync_to_restart,
nsjpeg_term_source };
union content_msg_data msg_data;
const char *data;
unsigned long size;
char *title;
/* check image header is valid and get width/height */
data = content__get_source_data(c, &size);
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = nsjpeg_error_exit;
jerr.output_message = nsjpeg_error_log;
if (setjmp(setjmp_buffer)) {
jpeg_destroy_decompress(&cinfo);
msg_data.error = nsjpeg_error_buffer;
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
jpeg_create_decompress(&cinfo);
cinfo.client_data = &setjmp_buffer;
source_mgr.next_input_byte = (unsigned char *) data;
source_mgr.bytes_in_buffer = size;
cinfo.src = &source_mgr;
jpeg_read_header(&cinfo, TRUE);
cinfo.out_color_space = JCS_RGB;
cinfo.dct_method = JDCT_ISLOW;
jpeg_calc_output_dimensions(&cinfo);
c->width = cinfo.output_width;
c->height = cinfo.output_height;
c->size = c->width * c->height * 4;
jpeg_destroy_decompress(&cinfo);
image_cache_add(c, NULL, jpeg_cache_convert);
/* set title text */
title = messages_get_buff("JPEGTitle",
nsurl_access_leaf(llcache_handle_get_url(c->llcache)),
c->width, c->height);
if (title != NULL) {
content__set_title(c, title);
free(title);
}
content_set_ready(c);
content_set_done(c);
content_set_status(c, ""); /* Done: update status bar */
return true;
}
/**
* Clone content.
*/
static nserror nsjpeg_clone(const struct content *old, struct content **newc)
{
struct content *jpeg_c;
nserror error;
jpeg_c = calloc(1, sizeof(struct content));
if (jpeg_c == NULL)
return NSERROR_NOMEM;
error = content__clone(old, jpeg_c);
if (error != NSERROR_OK) {
content_destroy(jpeg_c);
return error;
}
/* re-convert if the content is ready */
if ((old->status == CONTENT_STATUS_READY) ||
(old->status == CONTENT_STATUS_DONE)) {
if (nsjpeg_convert(jpeg_c) == false) {
content_destroy(jpeg_c);
return NSERROR_CLONE_FAILED;
}
}
*newc = jpeg_c;
return NSERROR_OK;
}
static const content_handler nsjpeg_content_handler = {
.create = nsjpeg_create,
.data_complete = nsjpeg_convert,
.destroy = image_cache_destroy,
.redraw = image_cache_redraw,
.clone = nsjpeg_clone,
.get_internal = image_cache_get_internal,
.type = image_cache_content_type,
.no_share = false,
};
static const char *nsjpeg_types[] = {
"image/jpeg",
"image/jpg",
"image/pjpeg"
};
CONTENT_FACTORY_REGISTER_TYPES(nsjpeg, nsjpeg_types, nsjpeg_content_handler);