diff options
Diffstat (limited to 'test/decode_gif.c')
| -rw-r--r-- | test/decode_gif.c | 66 |
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); } |