netsurf/riscos/png.c

415 lines
11 KiB
C

/*
* 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 2003 James Bursa <bursa@users.sourceforge.net>
*/
#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <swis.h>
#include "ifc.h"
#include "libpng/png.h"
#include "oslib/colourtrans.h"
#include "oslib/os.h"
#include "oslib/osspriteop.h"
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/riscos/png.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 */
#ifndef NO_IFC
#define ImageFileConvert_ConverterInfo 0x56842
#define PNG_TO_SPRITE 0x0b600ff9
static bool imagefileconvert;
#endif
/** maps colours to 256 mode colour numbers */
static os_colour_number colour_table[4096];
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)
{
_kernel_oserror *error;
unsigned int red, green, blue;
#ifndef NO_IFC
/* check if ImageFileConvert is available */
error = _swix(ImageFileConvert_ConverterInfo, _IN(0) | _IN(1),
0, PNG_TO_SPRITE);
imagefileconvert = !error;
if (imagefileconvert)
return;
#endif
/* generate colour lookup table for reducing to 8bpp */
for (red = 0; red != 0x10; red++)
for (green = 0; green != 0x10; green++)
for (blue = 0; blue != 0x10; blue++)
colour_table[red << 8 | green << 4 | blue] =
colourtrans_return_colour_number_for_mode(
blue << 28 | blue << 24 |
green << 20 | green << 16 |
red << 12 | red << 8,
(os_mode)21, 0);
}
void nspng_create(struct content *c, const char *params[])
{
#ifndef NO_IFC
// if (imagefileconvert) {
c->data.other.data = xcalloc(0, 1);
c->data.other.length = 0;
// return;
// }
#endif
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);
assert(0);
}
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)
{
#ifndef NO_IFC
// if (imagefileconvert) {
c->data.png.data = xrealloc(c->data.png.data,
c->data.png.length + size);
memcpy(c->data.png.data + c->data.png.length, data, size);
c->data.png.length += size;
// c->size += size;
// return;
// }
#endif
if (setjmp(png_jmpbuf(c->data.png.png))) {
png_destroy_read_struct(&c->data.png.png,
&c->data.png.info, 0);
assert(0);
}
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 i, bit_depth, color_type, palette_size, log2bpp, interlace;
unsigned int rowbytes, sprite_size;
unsigned long width, height;
struct content *c = png_get_progressive_ptr(png);
os_sprite_palette *sprite_palette;
osspriteop_area *sprite_area;
osspriteop_header *sprite;
png_color *png_palette;
png_color_16 *png_background;
png_color_16 default_background = {0, 0xffff, 0xffff, 0xffff, 0xffff};
/* screen mode image result
* any 8bpp or less (palette) 8bpp sprite
* 8bpp or less 16 or 24bpp dither to 8bpp
* 16 or 24bpp 16 or 24bpp sprite of same depth
*/
png_get_IHDR(png, info, &width, &height, &bit_depth,
&color_type, &interlace, 0, 0);
png_get_PLTE(png, info, &png_palette, &palette_size);
/*if (interlace == PNG_INTERLACE_ADAM7)
; png_set_interlace_handling(png);*/
if (png_get_bKGD(png, info, &png_background))
png_set_background(png, png_background,
PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
else
png_set_background(png, &default_background,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
xos_read_mode_variable(os_CURRENT_MODE, os_MODEVAR_LOG2_BPP,
&log2bpp, 0);
/* make sprite */
sprite_size = sizeof(*sprite_area) + sizeof(*sprite);
if (color_type == PNG_COLOR_TYPE_PALETTE)
sprite_size += 8 * 256 + height * ((width + 3) & ~3u);
else if (log2bpp < 4)
sprite_size += height * ((width + 3) & ~3u);
else
sprite_size += height * ((width + 3) & ~3u) * 4;
sprite_area = xcalloc(sprite_size + 1000, 1);
sprite_area->size = sprite_size;
sprite_area->sprite_count = 1;
sprite_area->first = sizeof(*sprite_area);
sprite_area->used = sprite_size;
sprite = (osspriteop_header *) (sprite_area + 1);
sprite->size = sprite_size - sizeof(*sprite_area);
strcpy(sprite->name, "png");
sprite->height = height - 1;
c->data.png.sprite_area = sprite_area;
if (color_type == PNG_COLOR_TYPE_PALETTE) {
/* making 256 colour sprite with PNG's palette */
LOG(("palette with %i entries", palette_size));
c->data.png.type = PNG_PALETTE;
sprite->width = ((width + 3) & ~3u) / 4 - 1;
sprite->left_bit = 0;
sprite->right_bit = (8 * (((width - 1) % 4) + 1)) - 1;
sprite->mask = sprite->image = sizeof(*sprite) + 8 * 256;
sprite->mode = (os_mode) 21;
sprite_palette = (os_sprite_palette *) (sprite + 1);
for (i = 0; i != palette_size; i++)
sprite_palette->entries[i].on =
sprite_palette->entries[i].off =
png_palette[i].blue << 24 |
png_palette[i].green << 16 |
png_palette[i].red << 8 | 16;
/* make 8bpp */
if (bit_depth < 8)
png_set_packing(png);
} else /*if (log2bpp < 4)*/ {
/* making 256 colour sprite with no palette */
LOG(("dithering down"));
c->data.png.type = PNG_DITHER;
sprite->width = ((width + 3) & ~3u) / 4 - 1;
sprite->left_bit = 0;
sprite->right_bit = (8 * (((width - 1) % 4) + 1)) - 1;
sprite->mask = sprite->image = sizeof(*sprite);
sprite->mode = (os_mode) 21;
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_gray_1_2_4_to_8(png);
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
if (bit_depth == 16)
png_set_strip_16(png);
} /*else {*/
/* convert everything to 24-bit RGB (actually 32-bit) */
/* LOG(("24-bit"));
c->data.png.type = PNG_DEEP;
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 (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
if (bit_depth == 16)
png_set_strip_16(png);
if (color_type == PNG_COLOR_TYPE_RGB)
png_set_filler(png, 0xff, PNG_FILLER_AFTER);
}*/
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, 4, 0, 2, 0, 1, 0};
static unsigned int interlace_step[8] = {8, 8, 4, 4, 2, 2, 1};
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 = 0, step = 1;
int red, green, blue;
char *row = c->data.png.sprite_image + row_num * ((c->width + 3) & ~3u);
/*LOG(("PNG row %li, pass %i, row %p, new_row %p",
row_num, pass, row, new_row));*/
if (new_row == 0)
return;
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;
row = c->data.png.sprite_image + row_num * ((c->width + 3) & ~3u);
}
if (c->data.png.type == PNG_PALETTE)
for (j = 0, i = start; i < rowbytes; i += step)
row[i] = new_row[j++];
else if (c->data.png.type == PNG_DITHER) {
for (j = 0, i = start; i * 3 < rowbytes; i += step) {
red = new_row[j++];
green = new_row[j++];
blue = new_row[j++];
row[i] = colour_table[(red >> 4) << 8 |
(green >> 4) << 4 |
(blue >> 4)];
}
}
}
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)
{
#ifndef NO_IFC
if (imagefileconvert) {
_kernel_oserror *kerror;
size_t dest_len;
os_error *error;
int w, h;
kerror = ifc_convert(c->data.png.data, c->data.png.length,
0xb60, 0xff9, (unsigned int)-1, 1,
(char**)&c->data.png.sprite_area, &dest_len);
if (kerror) {
LOG(("ifc_convert failed: %s", kerror->errmess));
return 1;
}
error = xosspriteop_read_sprite_info(osspriteop_PTR,
c->data.png.sprite_area,
(osspriteop_id)((char *) c->data.png.sprite_area
+ c->data.png.sprite_area->first),
&w, &h, NULL, NULL);
if (error) {
LOG(("error: %s", error->errmess));
return 1;
}
c->width = w;
c->height = h;
} else
#endif
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_revive(struct content *c, unsigned int width, unsigned int height)
{
}
void nspng_reformat(struct content *c, unsigned int width, unsigned int height)
{
}
void nspng_destroy(struct content *c)
{
xfree(c->title);
xfree(c->data.png.sprite_area);
#ifndef NO_IFC
// if (imagefileconvert) {
xfree(c->data.png.data);
// }
#endif
}
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)
{
int size;
osspriteop_trans_tab *table;
os_factors factors;
xcolourtrans_generate_table_for_sprite(c->data.png.sprite_area,
(osspriteop_id) ((char *) c->data.png.sprite_area +
c->data.png.sprite_area->first),
colourtrans_CURRENT_MODE, colourtrans_CURRENT_PALETTE,
0, colourtrans_GIVEN_SPRITE, 0, 0, &size);
table = xcalloc((unsigned int)size, 1);
xcolourtrans_generate_table_for_sprite(c->data.png.sprite_area,
(osspriteop_id) ((char *) c->data.png.sprite_area +
c->data.png.sprite_area->first),
colourtrans_CURRENT_MODE, colourtrans_CURRENT_PALETTE,
table, colourtrans_GIVEN_SPRITE, 0, 0, 0);
factors.xmul = width;
factors.ymul = height;
factors.xdiv = c->width * 2;
factors.ydiv = c->height * 2;
xosspriteop_put_sprite_scaled(osspriteop_PTR,
c->data.png.sprite_area,
(osspriteop_id) ((char *) c->data.png.sprite_area +
c->data.png.sprite_area->first),
x, (int)(y - height),
os_ACTION_OVERWRITE | os_ACTION_USE_MASK,
&factors, table);
xfree(table);
}
#endif