diff options
Diffstat (limited to 'pixman/test/utils.c')
| -rw-r--r-- | pixman/test/utils.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/pixman/test/utils.c b/pixman/test/utils.c index 44188ea90..adabd75dd 100644 --- a/pixman/test/utils.c +++ b/pixman/test/utils.c @@ -21,6 +21,10 @@ #include <fenv.h> #endif +#ifdef HAVE_LIBPNG +#include <png.h> +#endif + /* Random number seed */ @@ -335,6 +339,114 @@ make_random_bytes (int n_bytes) return bytes; } +#ifdef HAVE_LIBPNG + +static void +pngify_pixels (uint32_t *pixels, int n_pixels) +{ + int i; + + for (i = 0; i < n_pixels; ++i) + { + uint32_t p = pixels[i]; + uint8_t *out = (uint8_t *)&(pixels[i]); + uint8_t a, r, g, b; + + a = (p & 0xff000000) >> 24; + r = (p & 0x00ff0000) >> 16; + g = (p & 0x0000ff00) >> 8; + b = (p & 0x000000ff) >> 0; + + if (a != 0) + { + r = (r * 255) / a; + g = (g * 255) / a; + b = (b * 255) / a; + } + + *out++ = r; + *out++ = g; + *out++ = b; + *out++ = a; + } +} + +pixman_bool_t +write_png (pixman_image_t *image, const char *filename) +{ + int width = pixman_image_get_width (image); + int height = pixman_image_get_height (image); + int stride = width * 4; + uint32_t *data = malloc (height * stride); + pixman_image_t *copy; + png_struct *write_struct; + png_info *info_struct; + pixman_bool_t result = FALSE; + FILE *f = fopen (filename, "wb"); + png_bytep *row_pointers; + int i; + + if (!f) + return FALSE; + + row_pointers = malloc (height * sizeof (png_bytep)); + + copy = pixman_image_create_bits ( + PIXMAN_a8r8g8b8, width, height, data, stride); + + pixman_image_composite32 ( + PIXMAN_OP_SRC, image, NULL, copy, 0, 0, 0, 0, 0, 0, width, height); + + pngify_pixels (data, height * width); + + for (i = 0; i < height; ++i) + row_pointers[i] = (png_bytep)(data + i * width); + + if (!(write_struct = png_create_write_struct ( + PNG_LIBPNG_VER_STRING, NULL, NULL, NULL))) + goto out1; + + if (!(info_struct = png_create_info_struct (write_struct))) + goto out2; + + png_init_io (write_struct, f); + + png_set_IHDR (write_struct, info_struct, width, height, + 8, PNG_COLOR_TYPE_RGB_ALPHA, + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, + PNG_FILTER_TYPE_BASE); + + png_write_info (write_struct, info_struct); + + png_write_image (write_struct, row_pointers); + + png_write_end (write_struct, NULL); + + result = TRUE; + +out2: + png_destroy_write_struct (&write_struct, &info_struct); + +out1: + if (fclose (f) != 0) + result = FALSE; + + pixman_image_unref (copy); + free (row_pointers); + free (data); + return result; +} + +#else /* no libpng */ + +pixman_bool_t +write_png (pixman_image_t *image, const char *filename) +{ + return FALSE; +} + +#endif + /* * A function, which can be used as a core part of the test programs, * intended to detect various problems with the help of fuzzing input |