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-rw-r--r--image/jpeg.c393
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-/*
- * 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/utils.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 struct 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);