mirrors
/
netsurf
mirror of https://github.com/netsurf-browser/netsurf
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
netsurf/image/png.c

295 lines
8.2 KiB
C
Raw Blame History

/*
* 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>
/* Ugh -- setjmp.h weirdness ensues if this isn't first... */
#include "image/png.h"
#include "utils/config.h"
#include "desktop/plotters.h"
#include "content/content.h"
#include "image/bitmap.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/utils.h"
#ifdef WITH_PNG
/* I hate doing this, but without g_strdup_printf or similar, we're a tad stuck. */
#define NSPNG_TITLE_LEN (100)
/* libpng uses names starting png_, so use nspng_ here to avoid clashes */
static void info_callback(png_structp png, png_infop info);
static void row_callback(png_structp png, png_bytep new_row,
png_uint_32 row_num, int pass);
static void end_callback(png_structp png, png_infop info);
bool nspng_create(struct content *c, const char *params[])
{
union content_msg_data msg_data;
c->data.png.png = png_create_read_struct(PNG_LIBPNG_VER_STRING,
0, 0, 0);
c->data.png.bitmap = NULL;
if (!c->data.png.png) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
warn_user("NoMemory", 0);
return false;
}
c->data.png.info = png_create_info_struct(c->data.png.png);
if (!c->data.png.info) {
png_destroy_read_struct(&c->data.png.png,
&c->data.png.info, 0);
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
warn_user("NoMemory", 0);
return false;
}
if (setjmp(png_jmpbuf(c->data.png.png))) {
png_destroy_read_struct(&c->data.png.png,
&c->data.png.info, 0);
LOG(("Failed to set callbacks"));
c->data.png.png = NULL;
c->data.png.info = NULL;
msg_data.error = messages_get("PNGError");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
png_set_progressive_read_fn(c->data.png.png, c,
info_callback, row_callback, end_callback);
return true;
}
bool nspng_process_data(struct content *c, char *data, unsigned int size)
{
union content_msg_data msg_data;
if (setjmp(png_jmpbuf(c->data.png.png))) {
png_destroy_read_struct(&c->data.png.png,
&c->data.png.info, 0);
LOG(("Failed to process data"));
c->data.png.png = NULL;
c->data.png.info = NULL;
if (c->data.png.bitmap != NULL) {
bitmap_destroy(c->data.png.bitmap);
c->data.png.bitmap = NULL;
}
msg_data.error = messages_get("PNGError");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
png_process_data(c->data.png.png, c->data.png.info,
(uint8_t *) data, size);
return true;
}
/**
* info_callback -- PNG header has been completely received, prepare to process
* image data
*/
void info_callback(png_structp png, png_infop info)
{
int bit_depth, color_type, interlace, intent;
double gamma;
unsigned long width, height;
struct content *c = png_get_progressive_ptr(png);
/* Read the PNG details */
png_get_IHDR(png, info, &width, &height, &bit_depth,
&color_type, &interlace, 0, 0);
/* Claim the required memory for the converted PNG */
c->data.png.bitmap = bitmap_create(width, height, BITMAP_NEW);
c->data.png.bitbuffer = bitmap_get_buffer(c->data.png.bitmap);
c->data.png.rowstride = bitmap_get_rowstride(c->data.png.bitmap);
c->data.png.bpp = bitmap_get_bpp(c->data.png.bitmap);
/* Set up our transformations */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_gray_1_2_4_to_8(png);
if (png_get_valid(png, info, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(png);
if (bit_depth == 16)
png_set_strip_16(png);
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
if (!(color_type & PNG_COLOR_MASK_ALPHA))
png_set_filler(png, 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, info, &intent))
png_set_gamma(png, 2.2, 0.45455);
else {
if (png_get_gAMA(png, info, &gamma))
png_set_gamma(png, 2.2, gamma);
else
png_set_gamma(png, 2.2, 0.45455);
}
png_read_update_info(png, info);
c->data.png.rowbytes = png_get_rowbytes(png, info);
c->data.png.interlace = (interlace == PNG_INTERLACE_ADAM7);
c->width = width;
c->height = height;
LOG(("size %li * %li, bpp %i, rowbytes %zu", width,
height, bit_depth, c->data.png.rowbytes));
}
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};
void row_callback(png_structp png, png_bytep new_row,
png_uint_32 row_num, int pass)
{
struct content *c = png_get_progressive_ptr(png);
unsigned long i, j, rowbytes = c->data.png.rowbytes;
unsigned int start, step;
unsigned char *row = c->data.png.bitbuffer +
(c->data.png.rowstride * row_num);
/* Abort if we've not got any data */
if (new_row == 0)
return;
/* Handle interlaced sprites using the Adam7 algorithm */
if (c->data.png.interlace) {
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 = c->data.png.bitbuffer + (c->data.png.rowstride * row_num);
for (j = 0, i = start; i < rowbytes; i += step) {
row[i++] = new_row[j++];
row[i++] = new_row[j++];
row[i++] = new_row[j++];
row[i++] = new_row[j++];
}
} else {
/* Do a fast memcpy of the row data */
memcpy(row, new_row, rowbytes);
}
}
void end_callback(png_structp png, png_infop info)
{
}
bool nspng_convert(struct content *c, int width, int height)
{
assert(c->data.png.png);
assert(c->data.png.info);
png_destroy_read_struct(&c->data.png.png, &c->data.png.info, 0);
c->title = malloc(NSPNG_TITLE_LEN);
if (c->title != NULL) {
snprintf(c->title, NSPNG_TITLE_LEN, messages_get("PNGTitle"),
c->width, c->height, c->source_size);
}
c->size += (c->width * c->height * 4) + NSPNG_TITLE_LEN;
c->bitmap = c->data.png.bitmap;
bitmap_set_opaque(c->bitmap, bitmap_test_opaque(c->bitmap));
bitmap_modified(c->bitmap);
c->status = CONTENT_STATUS_DONE;
content_set_status(c, "");
return true;
}
void nspng_destroy(struct content *c)
{
free(c->title);
if (c->data.png.bitmap != NULL) {
bitmap_destroy(c->data.png.bitmap);
}
}
bool nspng_redraw(struct content *c, int x, int y,
int width, int height,
int clip_x0, int clip_y0, int clip_x1, int clip_y1,
float scale, colour background_colour)
{
if (c->bitmap != NULL) {
return plot.bitmap(x, y, width, height, c->bitmap,
background_colour, c);
}
return true;
}
bool nspng_redraw_tiled(struct content *c, int x, int y, int width, int height,
int clip_x0, int clip_y0, int clip_x1, int clip_y1,
float scale, colour background_colour,
bool repeat_x, bool repeat_y)
{
if (c->bitmap != NULL) {
return plot.bitmap_tile(x, y, width, height, c->bitmap,
background_colour, repeat_x, repeat_y, c);
}
return true;
}
#endif
Reference in New Issue View Git Blame Copy Permalink