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Diffstat (limited to 'Build/source/libs/libpng/libpng-1.6.1/contrib/examples/pngtopng.c')
-rw-r--r-- | Build/source/libs/libpng/libpng-1.6.1/contrib/examples/pngtopng.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/Build/source/libs/libpng/libpng-1.6.1/contrib/examples/pngtopng.c b/Build/source/libs/libpng/libpng-1.6.1/contrib/examples/pngtopng.c new file mode 100644 index 00000000000..b1b3be677b9 --- /dev/null +++ b/Build/source/libs/libpng/libpng-1.6.1/contrib/examples/pngtopng.c @@ -0,0 +1,92 @@ +/*- pngtopng + * + * COPYRIGHT: Written by John Cunningham Bowler, 2011. + * To the extent possible under law, the author has waived all copyright and + * related or neighboring rights to this work. This work is published from: + * United States. + * + * Read a PNG and write it out in a fixed format, using the 'simplified API' + * that was introduced in libpng-1.6.0. + * + * This sample code is just the code from the top of 'example.c' with some error + * handling added. See example.c for more comments. + */ +#include <stddef.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> + +/* Normally use <png.h> here to get the installed libpng, but this is done to + * ensure the code picks up the local libpng implementation: + */ +#include "../../png.h" + +int main(int argc, const char **argv) +{ + int result = 1; + + if (argc == 3) + { + png_image image; + + /* Only the image structure version number needs to be set. */ + memset(&image, 0, sizeof image); + image.version = PNG_IMAGE_VERSION; + + if (png_image_begin_read_from_file(&image, argv[1])) + { + png_bytep buffer; + + /* Change this to try different formats! If you set a colormap format + * then you must also supply a colormap below. + */ + image.format = PNG_FORMAT_RGBA; + + buffer = malloc(PNG_IMAGE_SIZE(image)); + + if (buffer != NULL) + { + if (png_image_finish_read(&image, NULL/*background*/, buffer, + 0/*row_stride*/, NULL/*colormap for PNG_FORMAT_FLAG_COLORMAP */)) + { + if (png_image_write_to_file(&image, argv[2], + 0/*convert_to_8bit*/, buffer, 0/*row_stride*/, + NULL/*colormap*/)) + result = 0; + + else + fprintf(stderr, "pngtopng: write %s: %s\n", argv[2], + image.message); + + free(buffer); + } + + else + { + fprintf(stderr, "pngtopng: read %s: %s\n", argv[1], + image.message); + + /* This is the only place where a 'free' is required; libpng does + * the cleanup on error and success, but in this case we couldn't + * complete the read because of running out of memory. + */ + png_image_free(&image); + } + } + + else + fprintf(stderr, "pngtopng: out of memory: %lu bytes\n", + (unsigned long)PNG_IMAGE_SIZE(image)); + } + + else + /* Failed to read the first argument: */ + fprintf(stderr, "pngtopng: %s: %s\n", argv[1], image.message); + } + + else + /* Wrong number of arguments */ + fprintf(stderr, "pngtopng: usage: pngtopng input-file output-file\n"); + + return result; +} |