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netsurf/image/jpeg.c

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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 "utils/config.h"
#ifdef WITH_JPEG
#include <assert.h>
#include <setjmp.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "content/content_protected.h"
#include "desktop/plotters.h"
#include "image/bitmap.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/types.h"
#include "utils/utils.h"
#define JPEG_INTERNAL_OPTIONS
#include "jpeglib.h"
#include "image/jpeg.h"
#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];
typedef struct nsjpeg_content {
struct content base; /**< base content */
} nsjpeg_content;
struct nsjpeg_error_mgr {
struct jpeg_error_mgr pub;
jmp_buf setjmp_buffer;
};
static const char *nsjpeg_types[] = {
"image/jpeg",
"image/jpg",
"image/pjpeg"
};
static lwc_string *nsjpeg_mime_types[NOF_ELEMENTS(nsjpeg_types)];
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)
{
nsjpeg_content *jpeg;
nserror error;
jpeg = talloc_zero(0, nsjpeg_content);
if (jpeg == NULL)
return NSERROR_NOMEM;
error = content__init(&jpeg->base, handler, imime_type, params,
llcache, fallback_charset, quirks);
if (error != NSERROR_OK) {
talloc_free(jpeg);
return error;
}
*c = (struct content *) 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)
{
}
/**
* Fatal error handler for JPEG library.
*
* This prevents jpeglib calling exit() on a fatal error.
*/
static void nsjpeg_error_exit(j_common_ptr cinfo)
{
struct nsjpeg_error_mgr *err = (struct nsjpeg_error_mgr *) cinfo->err;
err->pub.format_message(cinfo, nsjpeg_error_buffer);
longjmp(err->setjmp_buffer, 1);
}
/**
* Convert a CONTENT_JPEG for display.
*/
static bool nsjpeg_convert(struct content *c)
{
struct jpeg_decompress_struct cinfo;
struct nsjpeg_error_mgr jerr;
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 };
unsigned int height;
unsigned int width;
struct bitmap * volatile bitmap = NULL;
uint8_t * volatile pixels = NULL;
size_t rowstride;
union content_msg_data msg_data;
const char *data;
unsigned long size;
char title[100];
data = content__get_source_data(c, &size);
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = nsjpeg_error_exit;
if (setjmp(jerr.setjmp_buffer)) {
jpeg_destroy_decompress(&cinfo);
if (bitmap)
bitmap_destroy(bitmap);
msg_data.error = nsjpeg_error_buffer;
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
jpeg_create_decompress(&cinfo);
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_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
bitmap = bitmap_create(width, height, BITMAP_NEW | BITMAP_OPAQUE);
if (bitmap)
pixels = bitmap_get_buffer(bitmap);
if ((!bitmap) || (!pixels)) {
jpeg_destroy_decompress(&cinfo);
if (bitmap)
bitmap_destroy(bitmap);
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
rowstride = bitmap_get_rowstride(bitmap);
do {
#if RGB_RED != 0 || RGB_GREEN != 1 || RGB_BLUE != 2 || RGB_PIXELSIZE != 4
int i;
#endif
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
/* expand to RGBA */
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);
bitmap_modified(bitmap);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
c->width = width;
c->height = height;
c->bitmap = bitmap;
snprintf(title, sizeof(title), messages_get("JPEGTitle"),
width, height, size);
content__set_title(c, title);
c->size += height * rowstride;
content_set_ready(c);
content_set_done(c);
/* Done: update status bar */
content_set_status(c, "");
return true;
}
/**
* Destroy a CONTENT_JPEG and free all resources it owns.
*/
static void nsjpeg_destroy(struct content *c)
{
if (c->bitmap)
bitmap_destroy(c->bitmap);
}
/**
* Redraw a CONTENT_JPEG with appropriate tiling.
*/
static bool nsjpeg_redraw(struct content *c, struct content_redraw_data *data,
const struct rect *clip, const struct redraw_context *ctx)
{
bitmap_flags_t flags = BITMAPF_NONE;
if (data->repeat_x)
flags |= BITMAPF_REPEAT_X;
if (data->repeat_y)
flags |= BITMAPF_REPEAT_Y;
return ctx->plot->bitmap(data->x, data->y, data->width, data->height,
c->bitmap, data->background_colour, flags);
}
/**
* Clone content.
*/
static nserror nsjpeg_clone(const struct content *old, struct content **newc)
{
nsjpeg_content *jpeg_c;
nserror error;
jpeg_c = talloc_zero(0, nsjpeg_content);
if (jpeg_c == NULL)
return NSERROR_NOMEM;
error = content__clone(old, &jpeg_c->base);
if (error != NSERROR_OK) {
content_destroy(&jpeg_c->base);
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->base) == false) {
content_destroy(&jpeg_c->base);
return NSERROR_CLONE_FAILED;
}
}
*newc = (struct content *)jpeg_c;
return NSERROR_OK;
}
static content_type nsjpeg_content_type(lwc_string *mime_type)
{
return CONTENT_IMAGE;
}
static const content_handler nsjpeg_content_handler = {
.create = nsjpeg_create,
.data_complete = nsjpeg_convert,
.destroy = nsjpeg_destroy,
.redraw = nsjpeg_redraw,
.clone = nsjpeg_clone,
.type = nsjpeg_content_type,
.no_share = false,
};
nserror nsjpeg_init(void)
{
uint32_t i;
lwc_error lerror;
nserror error;
for (i = 0; i < NOF_ELEMENTS(nsjpeg_mime_types); i++) {
lerror = lwc_intern_string(nsjpeg_types[i],
strlen(nsjpeg_types[i]),
&nsjpeg_mime_types[i]);
if (lerror != lwc_error_ok) {
error = NSERROR_NOMEM;
goto error;
}
error = content_factory_register_handler(nsjpeg_mime_types[i],
&nsjpeg_content_handler);
if (error != NSERROR_OK)
goto error;
}
return NSERROR_OK;
error:
nsjpeg_fini();
return error;
}
void nsjpeg_fini(void)
{
uint32_t i;
for (i = 0; i < NOF_ELEMENTS(nsjpeg_mime_types); i++) {
if (nsjpeg_mime_types[i] != NULL) {
lwc_string_unref(nsjpeg_mime_types[i]);
}
}
}
#endif /* WITH_JPEG */
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