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Diffstat (limited to 'test')
-rw-r--r--test/decode_gif.c66
1 files changed, 41 insertions, 25 deletions
diff --git a/test/decode_gif.c b/test/decode_gif.c
index aafe7f6..0ce53c7 100644
--- a/test/decode_gif.c
+++ b/test/decode_gif.c
@@ -135,19 +135,22 @@ static void warning(const char *context, gif_result code)
fprintf(stderr, "\n");
}
-static void write_ppm(FILE* fh, const char *name, gif_animation *gif)
+static void write_ppm(FILE* fh, const char *name, gif_animation *gif,
+ bool no_write)
{
unsigned int i;
gif_result code;
- fprintf(fh, "P3\n");
- fprintf(fh, "# %s\n", name);
- fprintf(fh, "# width %u \n", gif->width);
- fprintf(fh, "# height %u \n", gif->height);
- fprintf(fh, "# frame_count %u \n", gif->frame_count);
- fprintf(fh, "# frame_count_partial %u \n", gif->frame_count_partial);
- fprintf(fh, "# loop_count %u \n", gif->loop_count);
- fprintf(fh, "%u %u 256\n", gif->width, gif->height * gif->frame_count);
+ if (!no_write) {
+ fprintf(fh, "P3\n");
+ fprintf(fh, "# %s\n", name);
+ fprintf(fh, "# width %u \n", gif->width);
+ fprintf(fh, "# height %u \n", gif->height);
+ fprintf(fh, "# frame_count %u \n", gif->frame_count);
+ fprintf(fh, "# frame_count_partial %u \n", gif->frame_count_partial);
+ fprintf(fh, "# loop_count %u \n", gif->loop_count);
+ fprintf(fh, "%u %u 256\n", gif->width, gif->height * gif->frame_count);
+ }
/* decode the frames */
for (i = 0; i != gif->frame_count; i++) {
@@ -158,17 +161,19 @@ static void write_ppm(FILE* fh, const char *name, gif_animation *gif)
if (code != GIF_OK)
warning("gif_decode_frame", code);
- fprintf(fh, "# frame %u:\n", i);
- image = (unsigned char *) gif->frame_image;
- for (row = 0; row != gif->height; row++) {
- for (col = 0; col != gif->width; col++) {
- size_t z = (row * gif->width + col) * 4;
- fprintf(fh, "%u %u %u ",
- (unsigned char) image[z],
- (unsigned char) image[z + 1],
- (unsigned char) image[z + 2]);
+ if (!no_write) {
+ fprintf(fh, "# frame %u:\n", i);
+ image = (unsigned char *) gif->frame_image;
+ for (row = 0; row != gif->height; row++) {
+ for (col = 0; col != gif->width; col++) {
+ size_t z = (row * gif->width + col) * 4;
+ fprintf(fh, "%u %u %u ",
+ (unsigned char) image[z],
+ (unsigned char) image[z + 1],
+ (unsigned char) image[z + 2]);
+ }
+ fprintf(fh, "\n");
}
- fprintf(fh, "\n");
}
}
@@ -189,17 +194,28 @@ int main(int argc, char *argv[])
gif_result code;
unsigned char *data;
FILE *outf = stdout;
+ bool no_write = false;
if (argc < 2) {
fprintf(stderr, "Usage: %s image.gif [out]\n", argv[0]);
+ fprintf(stderr, "\n");
+ fprintf(stderr, "If [out] is NOWRITE, the gif will be docoded "
+ "but not output.\n");
+ fprintf(stderr, "Otherwise [out] is an output filename.\n");
+ fprintf(stderr, "When [out] is unset, output is to stdout.\n");
+
return 1;
}
if (argc > 2) {
- outf = fopen(argv[2], "w+");
- if (outf == NULL) {
- fprintf(stderr, "Unable to open %s for writing\n", argv[2]);
- return 2;
+ if (strcmp(argv[2], "NOWRITE") == 0) {
+ no_write = true;
+ } else {
+ outf = fopen(argv[2], "w+");
+ if (outf == NULL) {
+ fprintf(stderr, "Unable to open %s for writing\n", argv[2]);
+ return 2;
+ }
}
}
@@ -218,9 +234,9 @@ int main(int argc, char *argv[])
}
} while (code != GIF_OK);
- write_ppm(outf, argv[1], &gif);
+ write_ppm(outf, argv[1], &gif, no_write);
- if (argc > 2) {
+ if (argc > 2 && !no_write) {
fclose(outf);
}