diff options
Diffstat (limited to 'test/write_png.c')
| -rw-r--r-- | test/write_png.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/test/write_png.c b/test/write_png.c index 2ea29d062..0ff5bcd3a 100644 --- a/test/write_png.c +++ b/test/write_png.c @@ -1,5 +1,5 @@ /* - * Copyright © 2003 USC, Information Sciences Institute + * Copyright © 2003 USC, Information Sciences Institute * * Permission to use, copy, modify, distribute, and sell this software * and its documentation for any purpose is hereby granted without @@ -22,7 +22,7 @@ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * - * Author: Carl D. Worth <cworth@isi.edu> + * Author: Carl D. Worth <cworth@cworth.org> */ #include <stdio.h> @@ -46,26 +46,24 @@ unpremultiply_data (png_structp png, png_row_infop row_info, png_bytep data) if (alpha == 0) { b[0] = b[1] = b[2] = b[3] = 0; } else { - b[0] = (((pixel & 0x0000ff) >> 0) * 255) / alpha; - b[1] = (((pixel & 0x00ff00) >> 8) * 255) / alpha; - b[2] = (((pixel & 0xff0000) >> 16) * 255) / alpha; + b[0] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha; + b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha; + b[2] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha; b[3] = alpha; } } } void -write_png_argb32 (char *buffer, char *filename, +write_png_argb32 (char *buffer, FILE *file, int width, int height, int stride) { - FILE *f; int i; png_struct *png; png_info *info; png_byte **rows; png_color_16 white; - f = fopen (filename, "w"); rows = malloc (height * sizeof(png_byte*)); for (i = 0; i < height; i++) { @@ -75,7 +73,7 @@ write_png_argb32 (char *buffer, char *filename, png = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); info = png_create_info_struct (png); - png_init_io (png, f); + png_init_io (png, file); png_set_IHDR (png, info, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA, @@ -98,5 +96,4 @@ write_png_argb32 (char *buffer, char *filename, png_destroy_write_struct (&png, &info); free (rows); - fclose (f); } |