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netsurf/framebuffer/convert_image.c

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/*
* Copyright 2009 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 <stdbool.h>
#include <errno.h>
#include <stdio.h>
#include <png.h>
#include <stdlib.h>
#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
static png_structp png;
static png_infop info;
static int interlace;
static size_t rowbytes;
static int raw_width, raw_height;
static int rowstride;
static unsigned char *bitmap_data;
static bool is_cursor = true;
static int raw_hot_x, raw_hot_y;
#define WIDTH (is_cursor?raw_width-1:raw_width)
#define HEIGHT (is_cursor?raw_height-1:raw_height)
#define HOT_X (is_cursor?raw_hot_x-1:0)
#define HOT_Y (is_cursor?raw_hot_y-1:0)
#define REAL(v) (is_cursor?v+1:v)
#define PPIX_AT(x,y) ((bitmap_data + (rowstride * y)) + (x * 4))
#define R_OFF 2
#define G_OFF 1
#define B_OFF 0
#define A_OFF 3
#define R_AT(x,y) *(PPIX_AT(x,y) + R_OFF)
#define G_AT(x,y) *(PPIX_AT(x,y) + G_OFF)
#define B_AT(x,y) *(PPIX_AT(x,y) + B_OFF)
#define A_AT(x,y) *(PPIX_AT(x,y) + A_OFF)
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);
static void
usage(void)
{
fprintf(stderr, "usage: fb_convert_image input.png output.inc varname\n");
}
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);
static void
detect_hotspot(void)
{
int i;
int greenpixels = 0;
for (i = 0; i < raw_width; ++i) {
if (A_AT(i, 0) == 255) {
if (G_AT(i, 0) == 255) {
greenpixels++;
raw_hot_x = i;
}
if ((B_AT(i, 0) != 0) || (R_AT(i, 0) != 0)) {
is_cursor = false;
return;
}
} else if (A_AT(i, 0) != 0) {
is_cursor = false;
return;
}
}
if (greenpixels != 1) {
is_cursor = false;
return;
}
for (i = 0; i < raw_height; ++i) {
if (A_AT(0, i) == 255) {
if (G_AT(0, i) == 255) {
greenpixels++;
raw_hot_y = i;
}
if ((B_AT(0, i) != 0) || (R_AT(0, i) != 0)) {
is_cursor = false;
return;
}
} else if (A_AT(0, i) != 0) {
is_cursor = false;
return;
}
}
if (greenpixels != 2) {
is_cursor = false;
return;
}
printf(" Pointer detected. Adjusted hotspot at %d, %d (0-based)\n",
raw_hot_x - 1, raw_hot_y - 1);
}
int
main(int argc, char **argv)
{
FILE *f;
unsigned char buffer[1024];
int br;
int x, y, c;
if (argc != 4) {
usage();
return 1;
}
printf(" CONVERT: %s (%s)\n", argv[1], argv[3]);
png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
info = png_create_info_struct(png);
png_set_progressive_read_fn(png, NULL, info_callback, row_callback, end_callback);
f = fopen(argv[1], "rb");
if (f == NULL) {
printf(" Unable to open %s\n", argv[1]);
return 1;
}
do {
br = fread(buffer, 1, 1024, f);
if (br > 0) {
png_process_data(png, info, buffer, br);
}
} while (br > 0);
if (br < 0) {
printf("Error reading input: %s\n", strerror(errno));
return 1;
}
fclose(f);
detect_hotspot();
f = fopen(argv[2], "w");
if (f == NULL) {
printf(" Unable to open %s\n", argv[2]);
return 2;
}
fprintf(f, "/* This file is auto-generated from %s\n", argv[1]);
fprintf(f, " *\n * Do not edit this file directly.\n */\n\n");
fprintf(f, "#include <sys/types.h>\n\n");
fprintf(f, "#include <stdint.h>\n\n");
fprintf(f, "#include <stdbool.h>\n\n");
fprintf(f, "#include \"framebuffer/bitmap.h\"\n\n");
fprintf(f, "static uint8_t %s_pixdata[] = {\n", argv[3]);
for (y = 0; y < HEIGHT; ++y) {
unsigned char *rowptr = bitmap_data + (rowstride * y);
if (is_cursor) {
/* If it's a cursor, skip one row and one column */
rowptr += rowstride + 4;
}
fprintf(f, "\t");
for (x = 0; x < WIDTH; ++x) {
for (c = 0; c < 4; ++c) {
unsigned char b = *rowptr++;
fprintf(f, "0x%02x, ", b);
}
}
fprintf(f, "\n");
}
fprintf(f, "};\n\n");
fprintf(f, "struct bitmap %s = {\n", argv[3]);
fprintf(f, "\t.width\t\t= %d,\n", WIDTH);
fprintf(f, "\t.height\t\t= %d,\n", HEIGHT);
fprintf(f, "\t.hot_x\t\t= %d,\n", HOT_X);
fprintf(f, "\t.hot_y\t\t= %d,\n", HOT_Y);
fprintf(f, "\t.pixdata\t= %s_pixdata,\n", argv[3]);
fprintf(f, "};\n\n");
fclose(f);
return 0;
}
static void
info_callback(png_structp png, png_infop info)
{
int bit_depth, color_type, interlace, intent;
double gamma;
unsigned long width, height;
/* Read the PNG details */
png_get_IHDR(png, info, &width, &height, &bit_depth,
&color_type, &interlace, 0, 0);
/* 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_expand_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);
rowbytes = png_get_rowbytes(png, info);
interlace = (interlace == PNG_INTERLACE_ADAM7);
raw_width = width;
raw_height = height;
rowstride = raw_width * 4;
bitmap_data = malloc(rowstride * raw_height);
}
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};
static void
row_callback(png_structp png, png_bytep new_row,
png_uint_32 row_num, int pass)
{
unsigned long i, j;
unsigned int start, step;
unsigned char *row = bitmap_data + (rowstride * row_num);
if (new_row == 0)
return;
if (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 = bitmap_data + (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 {
memcpy(row, new_row, rowbytes);
}
}
static void
end_callback(png_structp png, png_infop info)
{
}
/*
* Local Variables:
* c-basic-offset:8
* End:
*/
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