502 lines
12 KiB
C
502 lines
12 KiB
C
/*
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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* Copyright 2004 John M Bell <jmb202@ecs.soton.ac.uk>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file
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* implementation of content handling for image/jpeg
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*
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* This implementation uses the IJG JPEG library.
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*/
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#include <stdbool.h>
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#include <stdlib.h>
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#include <setjmp.h>
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#include "utils/utils.h"
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#include "utils/log.h"
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#include "utils/messages.h"
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#include "netsurf/bitmap.h"
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#include "content/llcache.h"
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#include "content/content.h"
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#include "content/content_protected.h"
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#include "content/content_factory.h"
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#include "desktop/gui_internal.h"
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#include "desktop/bitmap.h"
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#include "image/image_cache.h"
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#define JPEG_INTERNAL_OPTIONS
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#include "jpeglib.h"
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#include "jpeg.h"
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/** absolute minimum size of a jpeg below which it is not even worth
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* trying to read header data
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*/
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#define MIN_JPEG_SIZE 20
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#ifndef LIBJPEG_TURBO_VERSION
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#warning Using libjpeg (libjpeg-turbo is recommended)
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#endif
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static char nsjpeg_error_buffer[JMSG_LENGTH_MAX];
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static unsigned char nsjpeg_eoi[] = { 0xff, JPEG_EOI };
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/**
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* Content create entry point.
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*/
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static nserror nsjpeg_create(const content_handler *handler,
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lwc_string *imime_type, const struct http_parameter *params,
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llcache_handle *llcache, const char *fallback_charset,
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bool quirks, struct content **c)
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{
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struct content *jpeg;
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nserror error;
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jpeg = calloc(1, sizeof(struct content));
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if (jpeg == NULL)
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return NSERROR_NOMEM;
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error = content__init(jpeg, handler, imime_type, params,
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llcache, fallback_charset, quirks);
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if (error != NSERROR_OK) {
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free(jpeg);
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return error;
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}
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*c = jpeg;
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return NSERROR_OK;
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}
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/**
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* JPEG data source manager: initialize source.
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*/
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static void nsjpeg_init_source(j_decompress_ptr cinfo)
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{
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}
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/**
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* JPEG data source manager: fill the input buffer.
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*
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* This can only occur if the JPEG data was truncated or corrupted. Insert a
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* fake EOI marker to allow the decompressor to output as much as possible.
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*/
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static boolean nsjpeg_fill_input_buffer(j_decompress_ptr cinfo)
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{
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cinfo->src->next_input_byte = nsjpeg_eoi;
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cinfo->src->bytes_in_buffer = 2;
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return TRUE;
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}
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/**
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* JPEG data source manager: skip num_bytes worth of data.
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*/
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static void nsjpeg_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
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{
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if ((long) cinfo->src->bytes_in_buffer < num_bytes) {
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cinfo->src->next_input_byte = 0;
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cinfo->src->bytes_in_buffer = 0;
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} else {
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cinfo->src->next_input_byte += num_bytes;
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cinfo->src->bytes_in_buffer -= num_bytes;
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}
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}
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/**
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* JPEG data source manager: terminate source.
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*/
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static void nsjpeg_term_source(j_decompress_ptr cinfo)
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{
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}
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/**
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* Error output handler for JPEG library.
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*
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* This logs to NetSurf log instead of stderr.
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* Warnings only - fatal errors are trapped by nsjpeg_error_exit
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* and do not call the output handler.
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*/
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static void nsjpeg_error_log(j_common_ptr cinfo)
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{
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cinfo->err->format_message(cinfo, nsjpeg_error_buffer);
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NSLOG(netsurf, INFO, "%s", nsjpeg_error_buffer);
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}
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/**
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* Fatal error handler for JPEG library.
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*
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* This prevents jpeglib calling exit() on a fatal error.
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*/
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static void nsjpeg_error_exit(j_common_ptr cinfo)
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{
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jmp_buf *setjmp_buffer = (jmp_buf *) cinfo->client_data;
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cinfo->err->format_message(cinfo, nsjpeg_error_buffer);
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NSLOG(netsurf, INFO, "%s", nsjpeg_error_buffer);
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longjmp(*setjmp_buffer, 1);
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}
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/**
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* Convert scan lines from CMYK to core client bitmap layout.
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*/
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static inline void nsjpeg__decode_cmyk(
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struct jpeg_decompress_struct *cinfo,
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uint8_t * volatile pixels,
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size_t rowstride)
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{
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int width = cinfo->output_width * 4;
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do {
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JSAMPROW scanlines[1] = {
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[0] = (JSAMPROW)
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(pixels + rowstride * cinfo->output_scanline),
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};
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jpeg_read_scanlines(cinfo, scanlines, 1);
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for (int i = width - 4; 0 <= i; i -= 4) {
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/* Trivial inverse CMYK -> RGBA */
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const int c = scanlines[0][i + 0];
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const int m = scanlines[0][i + 1];
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const int y = scanlines[0][i + 2];
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const int k = scanlines[0][i + 3];
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const int ck = c * k;
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const int mk = m * k;
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const int yk = y * k;
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#define DIV255(x) ((x) + 1 + ((x) >> 8)) >> 8
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scanlines[0][i + bitmap_layout.r] = DIV255(ck);
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scanlines[0][i + bitmap_layout.g] = DIV255(mk);
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scanlines[0][i + bitmap_layout.b] = DIV255(yk);
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scanlines[0][i + bitmap_layout.a] = 0xff;
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#undef DIV255
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}
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} while (cinfo->output_scanline != cinfo->output_height);
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}
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/**
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* Convert scan lines from CMYK to core client bitmap layout.
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*/
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static inline void nsjpeg__decode_rgb(
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struct jpeg_decompress_struct *cinfo,
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uint8_t * volatile pixels,
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size_t rowstride)
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{
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int width = cinfo->output_width;
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do {
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JSAMPROW scanlines[1] = {
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[0] = (JSAMPROW)
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(pixels + rowstride * cinfo->output_scanline),
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};
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jpeg_read_scanlines(cinfo, scanlines, 1);
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#if RGB_RED != 0 || RGB_GREEN != 1 || RGB_BLUE != 2 || RGB_PIXELSIZE != 4
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/* Missmatch between configured libjpeg pixel format and
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* NetSurf pixel format. Convert to RGBA */
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for (int i = width - 1; 0 <= i; i--) {
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int r = scanlines[0][i * RGB_PIXELSIZE + RGB_RED];
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int g = scanlines[0][i * RGB_PIXELSIZE + RGB_GREEN];
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int b = scanlines[0][i * RGB_PIXELSIZE + RGB_BLUE];
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scanlines[0][i * 4 + bitmap_layout.r] = r;
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scanlines[0][i * 4 + bitmap_layout.g] = g;
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scanlines[0][i * 4 + bitmap_layout.b] = b;
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scanlines[0][i * 4 + bitmap_layout.a] = 0xff;
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}
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#endif
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} while (cinfo->output_scanline != cinfo->output_height);
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}
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/**
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* Convert scan lines from CMYK to core client bitmap layout.
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*/
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static inline void nsjpeg__decode_client_fmt(
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struct jpeg_decompress_struct *cinfo,
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uint8_t * volatile pixels,
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size_t rowstride)
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{
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do {
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JSAMPROW scanlines[1] = {
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[0] = (JSAMPROW)
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(pixels + rowstride * cinfo->output_scanline),
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};
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jpeg_read_scanlines(cinfo, scanlines, 1);
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} while (cinfo->output_scanline != cinfo->output_height);
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}
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/**
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* create a bitmap from jpeg content.
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*/
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static struct bitmap *
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jpeg_cache_convert(struct content *c)
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{
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const uint8_t *source_data; /* Jpeg source data */
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size_t source_size; /* length of Jpeg source data */
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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jmp_buf setjmp_buffer;
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struct bitmap * volatile bitmap = NULL;
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uint8_t * volatile pixels = NULL;
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size_t rowstride;
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struct jpeg_source_mgr source_mgr = {
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0,
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0,
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nsjpeg_init_source,
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nsjpeg_fill_input_buffer,
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nsjpeg_skip_input_data,
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jpeg_resync_to_restart,
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nsjpeg_term_source };
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/* obtain jpeg source data and perfom minimal sanity checks */
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source_data = content__get_source_data(c, &source_size);
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if ((source_data == NULL) ||
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(source_size < MIN_JPEG_SIZE)) {
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return NULL;
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}
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/* setup a JPEG library error handler */
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cinfo.err = jpeg_std_error(&jerr);
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jerr.error_exit = nsjpeg_error_exit;
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jerr.output_message = nsjpeg_error_log;
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/* handler for fatal errors during decompression */
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if (setjmp(setjmp_buffer)) {
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jpeg_destroy_decompress(&cinfo);
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return bitmap;
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}
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cinfo.client_data = &setjmp_buffer;
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jpeg_create_decompress(&cinfo);
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/* setup data source */
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source_mgr.next_input_byte = source_data;
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source_mgr.bytes_in_buffer = source_size;
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cinfo.src = &source_mgr;
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/* read JPEG header information */
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jpeg_read_header(&cinfo, TRUE);
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/* set output processing parameters */
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if (cinfo.jpeg_color_space == JCS_CMYK ||
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cinfo.jpeg_color_space == JCS_YCCK) {
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cinfo.out_color_space = JCS_CMYK;
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} else {
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#ifdef JCS_ALPHA_EXTENSIONS
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switch (bitmap_fmt.layout) {
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case BITMAP_LAYOUT_R8G8B8A8:
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cinfo.out_color_space = JCS_EXT_RGBA;
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break;
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case BITMAP_LAYOUT_B8G8R8A8:
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cinfo.out_color_space = JCS_EXT_BGRA;
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break;
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case BITMAP_LAYOUT_A8R8G8B8:
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cinfo.out_color_space = JCS_EXT_ARGB;
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break;
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case BITMAP_LAYOUT_A8B8G8R8:
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cinfo.out_color_space = JCS_EXT_ABGR;
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break;
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default:
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NSLOG(netsurf, ERROR, "Unexpected bitmap format: %u",
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bitmap_fmt.layout);
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jpeg_destroy_decompress(&cinfo);
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return NULL;
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}
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#else
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cinfo.out_color_space = JCS_RGB;
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#endif
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}
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cinfo.dct_method = JDCT_ISLOW;
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/* commence the decompression, output parameters now valid */
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jpeg_start_decompress(&cinfo);
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/* create opaque bitmap (jpegs cannot be transparent) */
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bitmap = guit->bitmap->create(
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cinfo.output_width,
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cinfo.output_height, BITMAP_OPAQUE);
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if (bitmap == NULL) {
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/* empty bitmap could not be created */
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jpeg_destroy_decompress(&cinfo);
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return NULL;
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}
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pixels = guit->bitmap->get_buffer(bitmap);
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if (pixels == NULL) {
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/* bitmap with no buffer available */
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guit->bitmap->destroy(bitmap);
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jpeg_destroy_decompress(&cinfo);
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return NULL;
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}
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/* Convert scanlines from jpeg into bitmap */
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rowstride = guit->bitmap->get_rowstride(bitmap);
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switch (cinfo.out_color_space) {
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case JCS_CMYK:
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nsjpeg__decode_cmyk(&cinfo, pixels, rowstride);
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break;
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case JCS_RGB:
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nsjpeg__decode_rgb(&cinfo, pixels, rowstride);
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break;
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default:
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nsjpeg__decode_client_fmt(&cinfo, pixels, rowstride);
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break;
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}
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guit->bitmap->modified(bitmap);
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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return bitmap;
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}
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/**
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* Convert a CONTENT_JPEG for display.
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*/
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static bool nsjpeg_convert(struct content *c)
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{
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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jmp_buf setjmp_buffer;
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struct jpeg_source_mgr source_mgr = { 0, 0,
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nsjpeg_init_source, nsjpeg_fill_input_buffer,
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nsjpeg_skip_input_data, jpeg_resync_to_restart,
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nsjpeg_term_source };
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union content_msg_data msg_data;
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const uint8_t *data;
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size_t size;
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char *title;
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/* check image header is valid and get width/height */
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data = content__get_source_data(c, &size);
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cinfo.err = jpeg_std_error(&jerr);
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jerr.error_exit = nsjpeg_error_exit;
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jerr.output_message = nsjpeg_error_log;
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if (setjmp(setjmp_buffer)) {
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jpeg_destroy_decompress(&cinfo);
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msg_data.errordata.errorcode = NSERROR_UNKNOWN;
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msg_data.errordata.errormsg = nsjpeg_error_buffer;
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content_broadcast(c, CONTENT_MSG_ERROR, &msg_data);
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return false;
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}
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cinfo.client_data = &setjmp_buffer;
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jpeg_create_decompress(&cinfo);
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source_mgr.next_input_byte = (unsigned char *) data;
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source_mgr.bytes_in_buffer = size;
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cinfo.src = &source_mgr;
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jpeg_read_header(&cinfo, TRUE);
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cinfo.out_color_space = JCS_RGB;
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cinfo.dct_method = JDCT_ISLOW;
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jpeg_calc_output_dimensions(&cinfo);
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c->width = cinfo.output_width;
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c->height = cinfo.output_height;
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c->size = c->width * c->height * 4;
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jpeg_destroy_decompress(&cinfo);
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image_cache_add(c, NULL, jpeg_cache_convert);
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/* set title text */
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title = messages_get_buff("JPEGTitle",
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nsurl_access_leaf(llcache_handle_get_url(c->llcache)),
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c->width, c->height);
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if (title != NULL) {
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content__set_title(c, title);
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free(title);
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}
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content_set_ready(c);
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content_set_done(c);
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content_set_status(c, ""); /* Done: update status bar */
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return true;
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}
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/**
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* Clone content.
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*/
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static nserror nsjpeg_clone(const struct content *old, struct content **newc)
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{
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struct content *jpeg_c;
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nserror error;
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jpeg_c = calloc(1, sizeof(struct content));
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if (jpeg_c == NULL)
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return NSERROR_NOMEM;
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error = content__clone(old, jpeg_c);
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if (error != NSERROR_OK) {
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content_destroy(jpeg_c);
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return error;
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}
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/* re-convert if the content is ready */
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if ((old->status == CONTENT_STATUS_READY) ||
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(old->status == CONTENT_STATUS_DONE)) {
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if (nsjpeg_convert(jpeg_c) == false) {
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content_destroy(jpeg_c);
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return NSERROR_CLONE_FAILED;
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}
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}
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*newc = jpeg_c;
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return NSERROR_OK;
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}
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static const content_handler nsjpeg_content_handler = {
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.create = nsjpeg_create,
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.data_complete = nsjpeg_convert,
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.destroy = image_cache_destroy,
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.redraw = image_cache_redraw,
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.clone = nsjpeg_clone,
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.get_internal = image_cache_get_internal,
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.type = image_cache_content_type,
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.is_opaque = image_cache_is_opaque,
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.no_share = false,
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};
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static const char *nsjpeg_types[] = {
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"image/jpeg",
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"image/jpg",
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"image/pjpeg"
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};
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CONTENT_FACTORY_REGISTER_TYPES(nsjpeg, nsjpeg_types, nsjpeg_content_handler);
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