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[libpng16] Corrected handling of row_pointers in example.c and added some

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comments.  It has apparently been wrong since libpng-1.0.1c (confusing
use of a 1D and a 2D array for the image source).
This commit is contained in:
Glenn Randers-Pehrson 2012-08-08 21:11:55 -05:00
parent ee427ad39a
commit cad0150d12
1 changed files with 3 additions and 1 deletions
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4
example.c
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@ -968,12 +968,14 @@ void write_png(char *file_name /* , ... other image information ... */)
* use the first method if you aren't handling interlacing yourself. * use the first method if you aren't handling interlacing yourself.
*/ */
png_uint_32 k, height, width; png_uint_32 k, height, width;
png_byte image[height][width*bytes_per_pixel]; /* In this example, "image" is a one-dimensional array of bytes */
png_byte image[height*width*bytes_per_pixel];
png_bytep row_pointers[height]; png_bytep row_pointers[height];
if (height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) if (height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
png_error (png_ptr, "Image is too tall to process in memory"); png_error (png_ptr, "Image is too tall to process in memory");
/* Set up pointers into your "image" byte array */
for (k = 0; k < height; k++) for (k = 0; k < height; k++)
row_pointers[k] = image + k*width*bytes_per_pixel; row_pointers[k] = image + k*width*bytes_per_pixel;