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netsurf/image/png.c

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/*
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
* Copyright 2004 Richard Wilson <not_ginger_matt@hotmail.com>
* Copyright 2008 Daniel Silverstone <dsilvers@netsurf-browser.org>
*
* 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/>.
*/
#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <png.h>
#include "utils/config.h"
#include "desktop/plotters.h"
#include "content/content_protected.h"
#include "image/bitmap.h"
#include "image/png.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/utils.h"
#ifdef WITH_PNG
/* accommodate for old versions of libpng (beware security holes!) */
#ifndef png_jmpbuf
#warning you have an antique libpng
#define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
#if PNG_LIBPNG_VER < 10209
#define png_set_expand_gray_1_2_4_to_8(png) png_set_gray_1_2_4_to_8(png)
#endif
typedef struct nspng_content {
struct content base; /**< base content type */
png_structp png;
png_infop info;
int interlace;
struct bitmap *bitmap; /**< Created NetSurf bitmap */
size_t rowstride, bpp; /**< Bitmap rowstride and bpp */
size_t rowbytes; /**< Number of bytes per row */
} nspng_content;
static const char *nspng_types[] = {
"image/png"
};
static lwc_string *nspng_mime_types[NOF_ELEMENTS(nspng_types)];
static unsigned int interlace_start[8] = {0, 16, 0, 8, 0, 4, 0};
static unsigned int interlace_step[8] = {28, 28, 12, 12, 4, 4, 0};
static unsigned int interlace_row_start[8] = {0, 0, 4, 0, 2, 0, 1};
static unsigned int interlace_row_step[8] = {8, 8, 8, 4, 4, 2, 2};
/**
* nspng_warning -- callback for libpng warnings
*/
static void nspng_warning(png_structp png_ptr, png_const_charp warning_message)
{
LOG(("%s", warning_message));
}
/**
* nspng_error -- callback for libpng errors
*/
static void nspng_error(png_structp png_ptr, png_const_charp error_message)
{
LOG(("%s", error_message));
longjmp(png_jmpbuf(png_ptr), 1);
}
/**
* info_callback -- PNG header has been completely received, prepare to process
* image data
*/
static void info_callback(png_structp png_s, png_infop info)
{
int bit_depth, color_type, interlace, intent;
double gamma;
png_uint_32 width, height;
nspng_content *png_c = png_get_progressive_ptr(png_s);
/* Read the PNG details */
png_get_IHDR(png_s, info, &width, &height, &bit_depth,
&color_type, &interlace, 0, 0);
/* Claim the required memory for the converted PNG */
png_c->bitmap = bitmap_create(width, height, BITMAP_NEW);
if (png_c->bitmap == NULL) {
/* Failed -- bail out */
longjmp(png_jmpbuf(png_s), 1);
}
png_c->rowstride = bitmap_get_rowstride(png_c->bitmap);
png_c->bpp = bitmap_get_bpp(png_c->bitmap);
/* Set up our transformations */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png_s);
if ((color_type == PNG_COLOR_TYPE_GRAY) && (bit_depth < 8))
png_set_expand_gray_1_2_4_to_8(png_s);
if (png_get_valid(png_s, info, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(png_s);
if (bit_depth == 16)
png_set_strip_16(png_s);
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_s);
if (!(color_type & PNG_COLOR_MASK_ALPHA))
png_set_filler(png_s, 0xff, PNG_FILLER_AFTER);
/* gamma correction - we use 2.2 as our screen gamma
* this appears to be correct (at least in respect to !Browse)
* see http://www.w3.org/Graphics/PNG/all_seven.html for a test case
*/
if (png_get_sRGB(png_s, info, &intent)) {
png_set_gamma(png_s, 2.2, 0.45455);
} else {
if (png_get_gAMA(png_s, info, &gamma)) {
png_set_gamma(png_s, 2.2, gamma);
} else {
png_set_gamma(png_s, 2.2, 0.45455);
}
}
png_read_update_info(png_s, info);
png_c->rowbytes = png_get_rowbytes(png_s, info);
png_c->interlace = (interlace == PNG_INTERLACE_ADAM7);
png_c->base.width = width;
png_c->base.height = height;
LOG(("size %li * %li, bpp %i, rowbytes %zu", (unsigned long)width,
(unsigned long)height, bit_depth, png_c->rowbytes));
}
static void row_callback(png_structp png_s, png_bytep new_row,
png_uint_32 row_num, int pass)
{
nspng_content *png_c = png_get_progressive_ptr(png_s);
unsigned long rowbytes = png_c->rowbytes;
unsigned char *buffer, *row;
/* Give up if there's no bitmap */
if (png_c->bitmap == NULL)
return;
/* Abort if we've not got any data */
if (new_row == NULL)
return;
/* Get bitmap buffer */
buffer = bitmap_get_buffer(png_c->bitmap);
if (buffer == NULL) {
/* No buffer, bail out */
longjmp(png_jmpbuf(png_s), 1);
}
/* Calculate address of row start */
row = buffer + (png_c->rowstride * row_num);
/* Handle interlaced sprites using the Adam7 algorithm */
if (png_c->interlace) {
unsigned long dst_off;
unsigned long src_off = 0;
unsigned int start, step;
start = interlace_start[pass];
step = interlace_step[pass];
row_num = interlace_row_start[pass] +
interlace_row_step[pass] * row_num;
/* Copy the data to our current row taking interlacing
* into consideration */
row = buffer + (png_c->rowstride * row_num);
for (dst_off = start; dst_off < rowbytes; dst_off += step) {
row[dst_off++] = new_row[src_off++];
row[dst_off++] = new_row[src_off++];
row[dst_off++] = new_row[src_off++];
row[dst_off++] = new_row[src_off++];
}
} else {
/* Do a fast memcpy of the row data */
memcpy(row, new_row, rowbytes);
}
}
static void end_callback(png_structp png_s, png_infop info)
{
}
static nserror nspng_create_png_data(nspng_content *png_c)
{
union content_msg_data msg_data;
png_c->bitmap = NULL;
png_c->png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if (png_c->png == NULL) {
msg_data.error = messages_get("NoMemory");
content_broadcast(&png_c->base, CONTENT_MSG_ERROR, msg_data);
warn_user("NoMemory", 0);
return NSERROR_NOMEM;
}
png_set_error_fn(png_c->png, NULL, nspng_error, nspng_warning);
png_c->info = png_create_info_struct(png_c->png);
if (png_c->info == NULL) {
png_destroy_read_struct(&png_c->png, &png_c->info, 0);
msg_data.error = messages_get("NoMemory");
content_broadcast(&png_c->base, CONTENT_MSG_ERROR, msg_data);
warn_user("NoMemory", 0);
return NSERROR_NOMEM;
}
if (setjmp(png_jmpbuf(png_c->png))) {
png_destroy_read_struct(&png_c->png, &png_c->info, 0);
LOG(("Failed to set callbacks"));
png_c->png = NULL;
png_c->info = NULL;
msg_data.error = messages_get("PNGError");
content_broadcast(&png_c->base, CONTENT_MSG_ERROR, msg_data);
return NSERROR_NOMEM;
}
png_set_progressive_read_fn(png_c->png, png_c,
info_callback, row_callback, end_callback);
return NSERROR_OK;
}
static nserror nspng_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)
{
nspng_content *png_c;
nserror error;
png_c = talloc_zero(0, nspng_content);
if (png_c == NULL)
return NSERROR_NOMEM;
error = content__init(&png_c->base, handler, imime_type, params,
llcache, fallback_charset, quirks);
if (error != NSERROR_OK) {
talloc_free(png_c);
return error;
}
error = nspng_create_png_data(png_c);
if (error != NSERROR_OK) {
talloc_free(png_c);
return error;
}
*c = (struct content *)png_c;
return NSERROR_OK;
}
static bool nspng_process_data(struct content *c, const char *data,
unsigned int size)
{
nspng_content *png_c = (nspng_content *)c;
union content_msg_data msg_data;
if (setjmp(png_jmpbuf(png_c->png))) {
png_destroy_read_struct(&png_c->png, &png_c->info, 0);
LOG(("Failed to process data"));
png_c->png = NULL;
png_c->info = NULL;
if (png_c->bitmap != NULL) {
bitmap_destroy(png_c->bitmap);
png_c->bitmap = NULL;
}
msg_data.error = messages_get("PNGError");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
png_process_data(png_c->png, png_c->info, (uint8_t *)data, size);
return true;
}
static bool nspng_convert(struct content *c)
{
nspng_content *png_c = (nspng_content *) c;
char title[100];
assert(png_c->png != NULL);
assert(png_c->info != NULL);
if (png_c->bitmap == NULL) {
union content_msg_data msg_data;
msg_data.error = messages_get("PNGError");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
c->status = CONTENT_STATUS_ERROR;
return false;
}
/* clean up png structures */
png_destroy_read_struct(&png_c->png, &png_c->info, 0);
c->size += (c->width * c->height * 4);
/* set title text */
snprintf(title, sizeof(title), messages_get("PNGTitle"),
c->width, c->height, c->size);
content__set_title(c, title);
bitmap_set_opaque(png_c->bitmap, bitmap_test_opaque(png_c->bitmap));
bitmap_modified(png_c->bitmap);
c->bitmap = png_c->bitmap; /* this needs to go */
content_set_ready(c);
content_set_done(c);
content_set_status(c, "");
return true;
}
static void nspng_destroy(struct content *c)
{
nspng_content *png_c = (nspng_content *) c;
if (png_c->bitmap != NULL) {
bitmap_destroy(png_c->bitmap);
}
}
static bool nspng_redraw(struct content *c, struct content_redraw_data *data,
const struct rect *clip, const struct redraw_context *ctx)
{
nspng_content *png_c = (nspng_content *) c;
bitmap_flags_t flags = BITMAPF_NONE;
assert(png_c->bitmap != NULL);
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,
png_c->bitmap, data->background_colour, flags);
}
static nserror nspng_clone(const struct content *old_c, struct content **new_c)
{
nspng_content *clone_png_c;
nserror error;
const char *data;
unsigned long size;
clone_png_c = talloc_zero(0, nspng_content);
if (clone_png_c == NULL)
return NSERROR_NOMEM;
error = content__clone(old_c, &clone_png_c->base);
if (error != NSERROR_OK) {
content_destroy(&clone_png_c->base);
return error;
}
/* Simply replay create/process/convert */
error = nspng_create_png_data(clone_png_c);
if (error != NSERROR_OK) {
content_destroy(&clone_png_c->base);
return error;
}
data = content__get_source_data(&clone_png_c->base, &size);
if (size > 0) {
if (nspng_process_data(&clone_png_c->base, data, size) == false) {
content_destroy(&clone_png_c->base);
return NSERROR_NOMEM;
}
}
if ((old_c->status == CONTENT_STATUS_READY) ||
(old_c->status == CONTENT_STATUS_DONE)) {
if (nspng_convert(&clone_png_c->base) == false) {
content_destroy(&clone_png_c->base);
return NSERROR_CLONE_FAILED;
}
}
*new_c = (struct content *)clone_png_c;
return NSERROR_OK;
}
static content_type nspng_content_type(lwc_string *mime_type)
{
return CONTENT_IMAGE;
}
static const content_handler nspng_content_handler = {
.create = nspng_create,
.process_data = nspng_process_data,
.data_complete = nspng_convert,
.destroy = nspng_destroy,
.redraw = nspng_redraw,
.clone = nspng_clone,
.type = nspng_content_type,
.no_share = false,
};
nserror nspng_init(void)
{
uint32_t i;
lwc_error lerror;
nserror error;
for (i = 0; i < NOF_ELEMENTS(nspng_mime_types); i++) {
lerror = lwc_intern_string(nspng_types[i],
strlen(nspng_types[i]),
&nspng_mime_types[i]);
if (lerror != lwc_error_ok) {
error = NSERROR_NOMEM;
goto error;
}
error = content_factory_register_handler(nspng_mime_types[i],
&nspng_content_handler);
if (error != NSERROR_OK)
goto error;
}
return NSERROR_OK;
error:
nspng_fini();
return error;
}
void nspng_fini(void)
{
uint32_t i;
for (i = 0; i < NOF_ELEMENTS(nspng_mime_types); i++) {
if (nspng_mime_types[i] != NULL)
lwc_string_unref(nspng_mime_types[i]);
}
}
#endif
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