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-rw-r--r--frontends/framebuffer/convert_image.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/frontends/framebuffer/convert_image.c b/frontends/framebuffer/convert_image.c
new file mode 100644
index 000000000..838a90703
--- /dev/null
+++ b/frontends/framebuffer/convert_image.c
@@ -0,0 +1,315 @@
+/*
+ * 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));
+ fclose(f);
+ 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 <libnsfb.h>\n\n");
+ fprintf(f, "#include \"desktop/plot_style.h\"\n");
+ fprintf(f, "#include \"framebuffer/gui.h\"\n");
+ fprintf(f, "#include \"framebuffer/fbtk.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 fbtk_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:
+ */
+