Soo many features added

weeee so much efficiencyyyy

1 files changed, 97 insertions, 0 deletions

diff --git a/.repos/farbfeld/png2ff.c b/.repos/farbfeld/png2ff.c
new file mode 100644
index 0000000..74109d8
--- /dev/null
+++ b/.repos/farbfeld/png2ff.c
@@ -0,0 +1,97 @@
+/* See LICENSE file for copyright and license details. */
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <png.h>
+
+#include "util.h"
+
+static void
+png_err(png_struct *pngs, const char *msg)
+{
+	(void)pngs;
+	die("libpng: %s", msg);
+}
+
+static void
+png_setup_reader(png_struct **s, png_info **i, uint32_t *w, uint32_t *h)
+{
+	*s = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, png_err, NULL);
+	*i = png_create_info_struct(*s);
+
+	if (!*s || !*i) {
+		die("Failed to initialize libpng");
+	}
+
+	png_init_io(*s, stdin);
+	if (png_get_valid(*s, *i, PNG_INFO_tRNS)) {
+		png_set_tRNS_to_alpha(*s);
+	}
+	png_set_add_alpha(*s, 255*257, PNG_FILLER_AFTER);
+	png_set_expand_gray_1_2_4_to_8(*s);
+	png_set_gray_to_rgb(*s);
+	png_set_packing(*s);
+	png_read_png(*s, *i, PNG_TRANSFORM_PACKING | PNG_TRANSFORM_EXPAND, NULL);
+	*w = png_get_image_width(*s, *i);
+	*h = png_get_image_height(*s, *i);
+}
+
+static void
+usage(void)
+{
+	die("usage: %s", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	png_struct *pngs;
+	png_info *pngi;
+	uint32_t width, height, rowlen, r, i;
+	uint16_t *row;
+	uint8_t **pngrows;
+
+	/* arguments */
+	argv0 = argv[0], argc--, argv++;
+
+	if (argc) {
+		usage();
+	}
+
+	/* prepare */
+	png_setup_reader(&pngs, &pngi, &width, &height);
+	row = ereallocarray(NULL, width, (sizeof("RGBA") - 1) * sizeof(uint16_t));
+	rowlen = width * (sizeof("RGBA") - 1);
+	pngrows = png_get_rows(pngs, pngi);
+
+	/* write data */
+	ff_write_header(width, height);
+
+	switch(png_get_bit_depth(pngs, pngi)) {
+	case 8:
+		for (r = 0; r < height; ++r) {
+			for (i = 0; i < rowlen; i++) {
+				row[i] = htons(257 * pngrows[r][i]);
+			}
+			efwrite(row, sizeof(uint16_t), rowlen, stdout);
+		}
+		break;
+	case 16:
+		for (r = 0; r < height; ++r) {
+			efwrite(pngrows[r], sizeof(uint16_t), rowlen, stdout);
+		}
+		break;
+	default:
+		die("Invalid bit-depth");
+	}
+
+	/* clean up */
+	png_destroy_read_struct(&pngs, &pngi, NULL);
+
+	return fshut(stdout, "<stdout>");
+}