netsurf/riscos/png.c

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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
* Copyright 2004 Richard Wilson <not_ginger_matt@hotmail.com>
*/
#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <swis.h>
#include "libpng/png.h"
#include "oslib/osspriteop.h"
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/riscos/gui.h"
#include "netsurf/riscos/options.h"
#include "netsurf/riscos/png.h"
#include "netsurf/riscos/tinct.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/messages.h"
#include "netsurf/utils/utils.h"
#ifdef WITH_PNG
/* 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);
void nspng_init(void)
{
}
void nspng_create(struct content *c, const char *params[])
{
c->data.png.sprite_area = 0;
c->data.png.png = png_create_read_struct(PNG_LIBPNG_VER_STRING,
0, 0, 0);
assert(c->data.png.png != 0);
c->data.png.info = png_create_info_struct(c->data.png.png);
assert(c->data.png.info != 0);
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;
return;
}
png_set_progressive_read_fn(c->data.png.png, c,
info_callback, row_callback, end_callback);
}
void nspng_process_data(struct content *c, char *data, unsigned long size)
{
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;
return;
}
LOG(("data %p, size %li", data, size));
png_process_data(c->data.png.png, c->data.png.info,
data, size);
c->size += size;
}
/**
* 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 int rowbytes, sprite_size;
unsigned long width, height;
struct content *c = png_get_progressive_ptr(png);
osspriteop_area *sprite_area;
osspriteop_header *sprite;
/* 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
*/
sprite_size = sizeof(*sprite_area) + sizeof(*sprite) + (height * width * 4);
sprite_area = xcalloc(sprite_size, 1);
/* Fill in the sprite area header information
*/
sprite_area->size = sprite_size;
sprite_area->sprite_count = 1;
sprite_area->first = sizeof(*sprite_area);
sprite_area->used = sprite_size;
/* Fill in the sprite header information
*/
sprite = (osspriteop_header *) (sprite_area + 1);
sprite->size = sprite_size - sizeof(*sprite_area);
strcpy(sprite->name, "png");
sprite->width = width - 1;
sprite->height = height - 1;
sprite->left_bit = 0;
sprite->right_bit = 31;
sprite->mask = sprite->image = sizeof(*sprite);
sprite->mode = (os_mode) 0x301680b5;
/* Store the sprite area
*/
c->data.png.sprite_area = sprite_area;
/* 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 = rowbytes = png_get_rowbytes(png, info);
c->data.png.interlace = (interlace == PNG_INTERLACE_ADAM7);
c->data.png.sprite_image = ((char *) sprite) + sprite->image;
c->width = width;
c->height = height;
LOG(("size %li * %li, bpp %i, rowbytes %u", width,
height, bit_depth, 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;
char *row = c->data.png.sprite_image + row_num * (c->width * 4);
/* 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 into consideration interlacing
*/
row = c->data.png.sprite_image + row_num * (c->width * 4);
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)
{
/*struct content *c = png_get_progressive_ptr(png);*/
LOG(("PNG end"));
/*xosspriteop_save_sprite_file(osspriteop_USER_AREA, c->data.png.sprite_area,
"png");*/
}
int nspng_convert(struct content *c, unsigned int width, unsigned int height)
{
if (c->data.png.png == NULL || c->data.png.info == NULL)
return 1;
png_destroy_read_struct(&c->data.png.png, &c->data.png.info, 0);
c->title = xcalloc(100, 1);
sprintf(c->title, messages_get("PNGTitle"), c->width, c->height);
c->status = CONTENT_STATUS_DONE;
return 0;
}
void nspng_destroy(struct content *c)
{
xfree(c->title);
xfree(c->data.png.sprite_area);
}
void nspng_redraw(struct content *c, long x, long y,
unsigned long width, unsigned long height,
long clip_x0, long clip_y0, long clip_x1, long clip_y1,
float scale)
{
unsigned int tinct_options;
/* If we have a gui_window then we work from there, if not we use the global
settings as we are drawing a thumbnail.
*/
if (ro_gui_current_redraw_gui) {
tinct_options = (ro_gui_current_redraw_gui->option_filter_sprites?(1<<1):0) |
(ro_gui_current_redraw_gui->option_dither_sprites?(1<<2):0);
} else {
tinct_options = (option_filter_sprites?(1<<1):0) |
(option_dither_sprites?(1<<2):0);
}
/* Tinct currently only handles 32bpp sprites that have an embedded alpha mask. Any
sprites not matching the required specifications are ignored. See the Tinct
documentation for further information.
*/
_swix(Tinct_PlotScaledAlpha, _IN(2) | _IN(3) | _IN(4) | _IN(5) | _IN(6) | _IN(7),
((char *) c->data.png.sprite_area + c->data.png.sprite_area->first),
x, (int)(y - height),
width, height,
tinct_options);
}
#endif