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Diffstat (limited to 'src/pixman/test/utils.c')
| -rw-r--r-- | src/pixman/test/utils.c | 1618 |
1 files changed, 1618 insertions, 0 deletions
diff --git a/src/pixman/test/utils.c b/src/pixman/test/utils.c new file mode 100644 index 0000000..ebe0ccc --- /dev/null +++ b/src/pixman/test/utils.c @@ -0,0 +1,1618 @@ +#define _GNU_SOURCE + +#include "utils.h" +#include <math.h> +#include <signal.h> +#include <stdlib.h> + +#ifdef HAVE_GETTIMEOFDAY +#include <sys/time.h> +#else +#include <time.h> +#endif + +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif + +#ifdef HAVE_FENV_H +#include <fenv.h> +#endif + +#ifdef HAVE_LIBPNG +#include <png.h> +#endif + +/* Random number generator state + */ + +prng_t prng_state_data; +prng_t *prng_state; + +/*----------------------------------------------------------------------------*\ + * CRC-32 version 2.0.0 by Craig Bruce, 2006-04-29. + * + * This program generates the CRC-32 values for the files named in the + * command-line arguments. These are the same CRC-32 values used by GZIP, + * PKZIP, and ZMODEM. The Crc32_ComputeBuf () can also be detached and + * used independently. + * + * THIS PROGRAM IS PUBLIC-DOMAIN SOFTWARE. + * + * Based on the byte-oriented implementation "File Verification Using CRC" + * by Mark R. Nelson in Dr. Dobb's Journal, May 1992, pp. 64-67. + * + * v1.0.0: original release. + * v1.0.1: fixed printf formats. + * v1.0.2: fixed something else. + * v1.0.3: replaced CRC constant table by generator function. + * v1.0.4: reformatted code, made ANSI C. 1994-12-05. + * v2.0.0: rewrote to use memory buffer & static table, 2006-04-29. +\*----------------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------------*\ + * NAME: + * Crc32_ComputeBuf () - computes the CRC-32 value of a memory buffer + * DESCRIPTION: + * Computes or accumulates the CRC-32 value for a memory buffer. + * The 'inCrc32' gives a previously accumulated CRC-32 value to allow + * a CRC to be generated for multiple sequential buffer-fuls of data. + * The 'inCrc32' for the first buffer must be zero. + * ARGUMENTS: + * inCrc32 - accumulated CRC-32 value, must be 0 on first call + * buf - buffer to compute CRC-32 value for + * bufLen - number of bytes in buffer + * RETURNS: + * crc32 - computed CRC-32 value + * ERRORS: + * (no errors are possible) +\*----------------------------------------------------------------------------*/ + +uint32_t +compute_crc32 (uint32_t in_crc32, + const void *buf, + size_t buf_len) +{ + static const uint32_t crc_table[256] = { + 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, + 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, + 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, + 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, + 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, + 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, + 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, + 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, + 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, + 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, + 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, + 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, + 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, + 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, + 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, + 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, + 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, + 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, + 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, + 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, + 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, + 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, + 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, + 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, + 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, + 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, + 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, + 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, + 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, + 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, + 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, + 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, + 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, + 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, + 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, + 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, + 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, + 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, + 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, + 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, + 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, + 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, + 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D + }; + + uint32_t crc32; + unsigned char * byte_buf; + size_t i; + + /* accumulate crc32 for buffer */ + crc32 = in_crc32 ^ 0xFFFFFFFF; + byte_buf = (unsigned char*) buf; + + for (i = 0; i < buf_len; i++) + crc32 = (crc32 >> 8) ^ crc_table[(crc32 ^ byte_buf[i]) & 0xFF]; + + return (crc32 ^ 0xFFFFFFFF); +} + +static uint32_t +compute_crc32_for_image_internal (uint32_t crc32, + pixman_image_t *img, + pixman_bool_t remove_alpha, + pixman_bool_t remove_rgb) +{ + pixman_format_code_t fmt = pixman_image_get_format (img); + uint32_t *data = pixman_image_get_data (img); + int stride = pixman_image_get_stride (img); + int height = pixman_image_get_height (img); + uint32_t mask = 0xffffffff; + int i; + + if (stride < 0) + { + data += (stride / 4) * (height - 1); + stride = - stride; + } + + /* mask unused 'x' part */ + if (PIXMAN_FORMAT_BPP (fmt) - PIXMAN_FORMAT_DEPTH (fmt) && + PIXMAN_FORMAT_DEPTH (fmt) != 0) + { + uint32_t m = (1 << PIXMAN_FORMAT_DEPTH (fmt)) - 1; + + if (PIXMAN_FORMAT_TYPE (fmt) == PIXMAN_TYPE_BGRA || + PIXMAN_FORMAT_TYPE (fmt) == PIXMAN_TYPE_RGBA) + { + m <<= (PIXMAN_FORMAT_BPP (fmt) - PIXMAN_FORMAT_DEPTH (fmt)); + } + + mask &= m; + } + + /* mask alpha channel */ + if (remove_alpha && PIXMAN_FORMAT_A (fmt)) + { + uint32_t m; + + if (PIXMAN_FORMAT_BPP (fmt) == 32) + m = 0xffffffff; + else + m = (1 << PIXMAN_FORMAT_BPP (fmt)) - 1; + + m >>= PIXMAN_FORMAT_A (fmt); + + if (PIXMAN_FORMAT_TYPE (fmt) == PIXMAN_TYPE_BGRA || + PIXMAN_FORMAT_TYPE (fmt) == PIXMAN_TYPE_RGBA || + PIXMAN_FORMAT_TYPE (fmt) == PIXMAN_TYPE_A) + { + /* Alpha is at the bottom of the pixel */ + m <<= PIXMAN_FORMAT_A (fmt); + } + + mask &= m; + } + + /* mask rgb channels */ + if (remove_rgb && PIXMAN_FORMAT_RGB (fmt)) + { + uint32_t m = ((uint32_t)~0) >> (32 - PIXMAN_FORMAT_BPP (fmt)); + uint32_t size = PIXMAN_FORMAT_R (fmt) + PIXMAN_FORMAT_G (fmt) + PIXMAN_FORMAT_B (fmt); + + m &= ~((1 << size) - 1); + + if (PIXMAN_FORMAT_TYPE (fmt) == PIXMAN_TYPE_BGRA || + PIXMAN_FORMAT_TYPE (fmt) == PIXMAN_TYPE_RGBA) + { + /* RGB channels are at the top of the pixel */ + m >>= size; + } + + mask &= m; + } + + for (i = 0; i * PIXMAN_FORMAT_BPP (fmt) < 32; i++) + mask |= mask << (i * PIXMAN_FORMAT_BPP (fmt)); + + for (i = 0; i < stride * height / 4; i++) + data[i] &= mask; + + /* swap endiannes in order to provide identical results on both big + * and litte endian systems + */ + image_endian_swap (img); + + return compute_crc32 (crc32, data, stride * height); +} + +uint32_t +compute_crc32_for_image (uint32_t crc32, + pixman_image_t *img) +{ + if (img->common.alpha_map) + { + crc32 = compute_crc32_for_image_internal (crc32, img, TRUE, FALSE); + crc32 = compute_crc32_for_image_internal ( + crc32, (pixman_image_t *)img->common.alpha_map, FALSE, TRUE); + } + else + { + crc32 = compute_crc32_for_image_internal (crc32, img, FALSE, FALSE); + } + + return crc32; +} + +void +print_image (pixman_image_t *image) +{ + int i, j; + int width, height, stride; + pixman_format_code_t format; + uint8_t *buffer; + int s; + + width = pixman_image_get_width (image); + height = pixman_image_get_height (image); + stride = pixman_image_get_stride (image); + format = pixman_image_get_format (image); + buffer = (uint8_t *)pixman_image_get_data (image); + + s = (stride >= 0)? stride : - stride; + + printf ("---\n"); + for (i = 0; i < height; i++) + { + for (j = 0; j < s; j++) + { + if (j == (width * PIXMAN_FORMAT_BPP (format) + 7) / 8) + printf ("| "); + + printf ("%02X ", *((uint8_t *)buffer + i * stride + j)); + } + printf ("\n"); + } + printf ("---\n"); +} + +/* perform endian conversion of pixel data + */ +void +image_endian_swap (pixman_image_t *img) +{ + int stride = pixman_image_get_stride (img); + uint32_t *data = pixman_image_get_data (img); + int height = pixman_image_get_height (img); + int bpp = PIXMAN_FORMAT_BPP (pixman_image_get_format (img)); + int i, j; + + /* swap bytes only on big endian systems */ + if (is_little_endian()) + return; + + if (bpp == 8) + return; + + for (i = 0; i < height; i++) + { + uint8_t *line_data = (uint8_t *)data + stride * i; + int s = (stride >= 0)? stride : - stride; + + switch (bpp) + { + case 1: + for (j = 0; j < s; j++) + { + line_data[j] = + ((line_data[j] & 0x80) >> 7) | + ((line_data[j] & 0x40) >> 5) | + ((line_data[j] & 0x20) >> 3) | + ((line_data[j] & 0x10) >> 1) | + ((line_data[j] & 0x08) << 1) | + ((line_data[j] & 0x04) << 3) | + ((line_data[j] & 0x02) << 5) | + ((line_data[j] & 0x01) << 7); + } + break; + case 4: + for (j = 0; j < s; j++) + { + line_data[j] = (line_data[j] >> 4) | (line_data[j] << 4); + } + break; + case 16: + for (j = 0; j + 2 <= s; j += 2) + { + char t1 = line_data[j + 0]; + char t2 = line_data[j + 1]; + + line_data[j + 1] = t1; + line_data[j + 0] = t2; + } + break; + case 24: + for (j = 0; j + 3 <= s; j += 3) + { + char t1 = line_data[j + 0]; + char t2 = line_data[j + 1]; + char t3 = line_data[j + 2]; + + line_data[j + 2] = t1; + line_data[j + 1] = t2; + line_data[j + 0] = t3; + } + break; + case 32: + for (j = 0; j + 4 <= s; j += 4) + { + char t1 = line_data[j + 0]; + char t2 = line_data[j + 1]; + char t3 = line_data[j + 2]; + char t4 = line_data[j + 3]; + + line_data[j + 3] = t1; + line_data[j + 2] = t2; + line_data[j + 1] = t3; + line_data[j + 0] = t4; + } + break; + default: + assert (FALSE); + break; + } + } +} + +#define N_LEADING_PROTECTED 10 +#define N_TRAILING_PROTECTED 10 + +typedef struct +{ + void *addr; + uint32_t len; + uint8_t *trailing; + int n_bytes; +} info_t; + +#if defined(HAVE_MPROTECT) && defined(HAVE_GETPAGESIZE) && defined(HAVE_SYS_MMAN_H) && defined(HAVE_MMAP) + +/* This is apparently necessary on at least OS X */ +#ifndef MAP_ANONYMOUS +#define MAP_ANONYMOUS MAP_ANON +#endif + +void * +fence_malloc (int64_t len) +{ + unsigned long page_size = getpagesize(); + unsigned long page_mask = page_size - 1; + uint32_t n_payload_bytes = (len + page_mask) & ~page_mask; + uint32_t n_bytes = + (page_size * (N_LEADING_PROTECTED + N_TRAILING_PROTECTED + 2) + + n_payload_bytes) & ~page_mask; + uint8_t *initial_page; + uint8_t *leading_protected; + uint8_t *trailing_protected; + uint8_t *payload; + uint8_t *addr; + + if (len < 0) + abort(); + + addr = mmap (NULL, n_bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, + -1, 0); + + if (addr == MAP_FAILED) + { + printf ("mmap failed on %lld %u\n", (long long int)len, n_bytes); + return NULL; + } + + initial_page = (uint8_t *)(((uintptr_t)addr + page_mask) & ~page_mask); + leading_protected = initial_page + page_size; + payload = leading_protected + N_LEADING_PROTECTED * page_size; + trailing_protected = payload + n_payload_bytes; + + ((info_t *)initial_page)->addr = addr; + ((info_t *)initial_page)->len = len; + ((info_t *)initial_page)->trailing = trailing_protected; + ((info_t *)initial_page)->n_bytes = n_bytes; + + if ((mprotect (leading_protected, N_LEADING_PROTECTED * page_size, + PROT_NONE) == -1) || + (mprotect (trailing_protected, N_TRAILING_PROTECTED * page_size, + PROT_NONE) == -1)) + { + munmap (addr, n_bytes); + return NULL; + } + + return payload; +} + +void +fence_free (void *data) +{ + uint32_t page_size = getpagesize(); + uint8_t *payload = data; + uint8_t *leading_protected = payload - N_LEADING_PROTECTED * page_size; + uint8_t *initial_page = leading_protected - page_size; + info_t *info = (info_t *)initial_page; + + munmap (info->addr, info->n_bytes); +} + +#else + +void * +fence_malloc (int64_t len) +{ + return malloc (len); +} + +void +fence_free (void *data) +{ + free (data); +} + +#endif + +uint8_t * +make_random_bytes (int n_bytes) +{ + uint8_t *bytes = fence_malloc (n_bytes); + + if (!bytes) + return NULL; + + prng_randmemset (bytes, n_bytes, 0); + + return bytes; +} + +void +a8r8g8b8_to_rgba_np (uint32_t *dst, uint32_t *src, int n_pixels) +{ + uint8_t *dst8 = (uint8_t *)dst; + int i; + + for (i = 0; i < n_pixels; ++i) + { + uint32_t p = src[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) + { +#define DIVIDE(c, a) \ + do \ + { \ + int t = ((c) * 255) / a; \ + (c) = t < 0? 0 : t > 255? 255 : t; \ + } while (0) + + DIVIDE (r, a); + DIVIDE (g, a); + DIVIDE (b, a); + } + + *dst8++ = r; + *dst8++ = g; + *dst8++ = b; + *dst8++ = a; + } +} + +#ifdef HAVE_LIBPNG + +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); + + a8r8g8b8_to_rgba_np (data, 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 + +static void +color8_to_color16 (uint32_t color8, pixman_color_t *color16) +{ + color16->alpha = ((color8 & 0xff000000) >> 24); + color16->red = ((color8 & 0x00ff0000) >> 16); + color16->green = ((color8 & 0x0000ff00) >> 8); + color16->blue = ((color8 & 0x000000ff) >> 0); + + color16->alpha |= color16->alpha << 8; + color16->red |= color16->red << 8; + color16->blue |= color16->blue << 8; + color16->green |= color16->green << 8; +} + +void +draw_checkerboard (pixman_image_t *image, + int check_size, + uint32_t color1, uint32_t color2) +{ + pixman_color_t check1, check2; + pixman_image_t *c1, *c2; + int n_checks_x, n_checks_y; + int i, j; + + color8_to_color16 (color1, &check1); + color8_to_color16 (color2, &check2); + + c1 = pixman_image_create_solid_fill (&check1); + c2 = pixman_image_create_solid_fill (&check2); + + n_checks_x = ( + pixman_image_get_width (image) + check_size - 1) / check_size; + n_checks_y = ( + pixman_image_get_height (image) + check_size - 1) / check_size; + + for (j = 0; j < n_checks_y; j++) + { + for (i = 0; i < n_checks_x; i++) + { + pixman_image_t *src; + + if (((i ^ j) & 1)) + src = c1; + else + src = c2; + + pixman_image_composite32 (PIXMAN_OP_SRC, src, NULL, image, + 0, 0, 0, 0, + i * check_size, j * check_size, + check_size, check_size); + } + } +} + +static uint32_t +call_test_function (uint32_t (*test_function)(int testnum, int verbose), + int testnum, + int verbose) +{ + uint32_t retval; + +#if defined (__GNUC__) && defined (_WIN32) && (defined (__i386) || defined (__i386__)) + __asm__ ( + /* Deliberately avoid aligning the stack to 16 bytes */ + "pushl %1\n\t" + "pushl %2\n\t" + "call *%3\n\t" + "addl $8, %%esp\n\t" + : "=a" (retval) + : "r" (verbose), + "r" (testnum), + "r" (test_function) + : "edx", "ecx"); /* caller save registers */ +#else + retval = test_function (testnum, verbose); +#endif + + return retval; +} + +/* + * 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 + * to pixman API (according to some templates, aka "smart" fuzzing). + * Some general information about such testing can be found here: + * http://en.wikipedia.org/wiki/Fuzz_testing + * + * It may help detecting: + * - crashes on bad handling of valid or reasonably invalid input to + * pixman API. + * - deviations from the behavior of older pixman releases. + * - deviations from the behavior of the same pixman release, but + * configured in a different way (for example with SIMD optimizations + * disabled), or running on a different OS or hardware. + * + * The test is performed by calling a callback function a huge number + * of times. The callback function is expected to run some snippet of + * pixman code with pseudorandom variations to the data feeded to + * pixman API. A result of running each callback function should be + * some deterministic value which depends on test number (test number + * can be used as a seed for PRNG). When 'verbose' argument is nonzero, + * callback function is expected to print to stdout some information + * about what it does. + * + * Return values from many small tests are accumulated together and + * used as final checksum, which can be compared to some expected + * value. Running the tests not individually, but in a batch helps + * to reduce process start overhead and also allows to parallelize + * testing and utilize multiple CPU cores. + * + * The resulting executable can be run without any arguments. In + * this case it runs a batch of tests starting from 1 and up to + * 'default_number_of_iterations'. The resulting checksum is + * compared with 'expected_checksum' and FAIL or PASS verdict + * depends on the result of this comparison. + * + * If the executable is run with 2 numbers provided as command line + * arguments, they specify the starting and ending numbers for a test + * batch. + * + * If the executable is run with only one number provided as a command + * line argument, then this number is used to call the callback function + * once, and also with verbose flag set. + */ +int +fuzzer_test_main (const char *test_name, + int default_number_of_iterations, + uint32_t expected_checksum, + uint32_t (*test_function)(int testnum, int verbose), + int argc, + const char *argv[]) +{ + int i, n1 = 1, n2 = 0; + uint32_t checksum = 0; + int verbose = getenv ("VERBOSE") != NULL; + + if (argc >= 3) + { + n1 = atoi (argv[1]); + n2 = atoi (argv[2]); + if (n2 < n1) + { + printf ("invalid test range\n"); + return 1; + } + } + else if (argc >= 2) + { + n2 = atoi (argv[1]); + + checksum = call_test_function (test_function, n2, 1); + + printf ("%d: checksum=%08X\n", n2, checksum); + return 0; + } + else + { + n1 = 1; + n2 = default_number_of_iterations; + } + +#ifdef USE_OPENMP + #pragma omp parallel for reduction(+:checksum) default(none) \ + shared(n1, n2, test_function, verbose) +#endif + for (i = n1; i <= n2; i++) + { + uint32_t crc = call_test_function (test_function, i, 0); + if (verbose) + printf ("%d: %08X\n", i, crc); + checksum += crc; + } + + if (n1 == 1 && n2 == default_number_of_iterations) + { + if (checksum == expected_checksum) + { + printf ("%s test passed (checksum=%08X)\n", + test_name, checksum); + } + else + { + printf ("%s test failed! (checksum=%08X, expected %08X)\n", + test_name, checksum, expected_checksum); + return 1; + } + } + else + { + printf ("%d-%d: checksum=%08X\n", n1, n2, checksum); + } + + return 0; +} + +/* Try to obtain current time in seconds */ +double +gettime (void) +{ +#ifdef HAVE_GETTIMEOFDAY + struct timeval tv; + + gettimeofday (&tv, NULL); + return (double)((int64_t)tv.tv_sec * 1000000 + tv.tv_usec) / 1000000.; +#else + return (double)clock() / (double)CLOCKS_PER_SEC; +#endif +} + +uint32_t +get_random_seed (void) +{ + union { double d; uint32_t u32; } t; + t.d = gettime(); + prng_srand (t.u32); + + return prng_rand (); +} + +#ifdef HAVE_SIGACTION +#ifdef HAVE_ALARM +static const char *global_msg; + +static void +on_alarm (int signo) +{ + printf ("%s\n", global_msg); + exit (1); +} +#endif +#endif + +void +fail_after (int seconds, const char *msg) +{ +#ifdef HAVE_SIGACTION +#ifdef HAVE_ALARM + struct sigaction action; + + global_msg = msg; + + memset (&action, 0, sizeof (action)); + action.sa_handler = on_alarm; + + alarm (seconds); + + sigaction (SIGALRM, &action, NULL); +#endif +#endif +} + +void +enable_divbyzero_exceptions (void) +{ +#ifdef HAVE_FENV_H +#ifdef HAVE_FEENABLEEXCEPT + feenableexcept (FE_DIVBYZERO); +#endif +#endif +} + +void * +aligned_malloc (size_t align, size_t size) +{ + void *result; + +#ifdef HAVE_POSIX_MEMALIGN + if (posix_memalign (&result, align, size) != 0) + result = NULL; +#else + result = malloc (size); +#endif + + return result; +} + +#define CONVERT_15(c, is_rgb) \ + (is_rgb? \ + ((((c) >> 3) & 0x001f) | \ + (((c) >> 6) & 0x03e0) | \ + (((c) >> 9) & 0x7c00)) : \ + (((((c) >> 16) & 0xff) * 153 + \ + (((c) >> 8) & 0xff) * 301 + \ + (((c) ) & 0xff) * 58) >> 2)) + +double +convert_srgb_to_linear (double c) +{ + if (c <= 0.04045) + return c / 12.92; + else + return pow ((c + 0.055) / 1.055, 2.4); +} + +double +convert_linear_to_srgb (double c) +{ + if (c <= 0.0031308) + return c * 12.92; + else + return 1.055 * pow (c, 1.0/2.4) - 0.055; +} + +void +initialize_palette (pixman_indexed_t *palette, uint32_t depth, int is_rgb) +{ + int i; + uint32_t mask = (1 << depth) - 1; + + for (i = 0; i < 32768; ++i) + palette->ent[i] = prng_rand() & mask; + + memset (palette->rgba, 0, sizeof (palette->rgba)); + + for (i = 0; i < mask + 1; ++i) + { + uint32_t rgba24; + pixman_bool_t retry; + uint32_t i15; + + /* We filled the rgb->index map with random numbers, but we + * do need the ability to round trip, that is if some indexed + * color expands to an argb24, then the 15 bit version of that + * color must map back to the index. Anything else, we don't + * care about too much. + */ + do + { + uint32_t old_idx; + + rgba24 = prng_rand(); + i15 = CONVERT_15 (rgba24, is_rgb); + + old_idx = palette->ent[i15]; + if (CONVERT_15 (palette->rgba[old_idx], is_rgb) == i15) + retry = 1; + else + retry = 0; + } while (retry); + + palette->rgba[i] = rgba24; + palette->ent[i15] = i; + } + + for (i = 0; i < mask + 1; ++i) + { + assert (palette->ent[CONVERT_15 (palette->rgba[i], is_rgb)] == i); + } +} + +const char * +operator_name (pixman_op_t op) +{ + switch (op) + { + case PIXMAN_OP_CLEAR: return "PIXMAN_OP_CLEAR"; + case PIXMAN_OP_SRC: return "PIXMAN_OP_SRC"; + case PIXMAN_OP_DST: return "PIXMAN_OP_DST"; + case PIXMAN_OP_OVER: return "PIXMAN_OP_OVER"; + case PIXMAN_OP_OVER_REVERSE: return "PIXMAN_OP_OVER_REVERSE"; + case PIXMAN_OP_IN: return "PIXMAN_OP_IN"; + case PIXMAN_OP_IN_REVERSE: return "PIXMAN_OP_IN_REVERSE"; + case PIXMAN_OP_OUT: return "PIXMAN_OP_OUT"; + case PIXMAN_OP_OUT_REVERSE: return "PIXMAN_OP_OUT_REVERSE"; + case PIXMAN_OP_ATOP: return "PIXMAN_OP_ATOP"; + case PIXMAN_OP_ATOP_REVERSE: return "PIXMAN_OP_ATOP_REVERSE"; + case PIXMAN_OP_XOR: return "PIXMAN_OP_XOR"; + case PIXMAN_OP_ADD: return "PIXMAN_OP_ADD"; + case PIXMAN_OP_SATURATE: return "PIXMAN_OP_SATURATE"; + + case PIXMAN_OP_DISJOINT_CLEAR: return "PIXMAN_OP_DISJOINT_CLEAR"; + case PIXMAN_OP_DISJOINT_SRC: return "PIXMAN_OP_DISJOINT_SRC"; + case PIXMAN_OP_DISJOINT_DST: return "PIXMAN_OP_DISJOINT_DST"; + case PIXMAN_OP_DISJOINT_OVER: return "PIXMAN_OP_DISJOINT_OVER"; + case PIXMAN_OP_DISJOINT_OVER_REVERSE: return "PIXMAN_OP_DISJOINT_OVER_REVERSE"; + case PIXMAN_OP_DISJOINT_IN: return "PIXMAN_OP_DISJOINT_IN"; + case PIXMAN_OP_DISJOINT_IN_REVERSE: return "PIXMAN_OP_DISJOINT_IN_REVERSE"; + case PIXMAN_OP_DISJOINT_OUT: return "PIXMAN_OP_DISJOINT_OUT"; + case PIXMAN_OP_DISJOINT_OUT_REVERSE: return "PIXMAN_OP_DISJOINT_OUT_REVERSE"; + case PIXMAN_OP_DISJOINT_ATOP: return "PIXMAN_OP_DISJOINT_ATOP"; + case PIXMAN_OP_DISJOINT_ATOP_REVERSE: return "PIXMAN_OP_DISJOINT_ATOP_REVERSE"; + case PIXMAN_OP_DISJOINT_XOR: return "PIXMAN_OP_DISJOINT_XOR"; + + case PIXMAN_OP_CONJOINT_CLEAR: return "PIXMAN_OP_CONJOINT_CLEAR"; + case PIXMAN_OP_CONJOINT_SRC: return "PIXMAN_OP_CONJOINT_SRC"; + case PIXMAN_OP_CONJOINT_DST: return "PIXMAN_OP_CONJOINT_DST"; + case PIXMAN_OP_CONJOINT_OVER: return "PIXMAN_OP_CONJOINT_OVER"; + case PIXMAN_OP_CONJOINT_OVER_REVERSE: return "PIXMAN_OP_CONJOINT_OVER_REVERSE"; + case PIXMAN_OP_CONJOINT_IN: return "PIXMAN_OP_CONJOINT_IN"; + case PIXMAN_OP_CONJOINT_IN_REVERSE: return "PIXMAN_OP_CONJOINT_IN_REVERSE"; + case PIXMAN_OP_CONJOINT_OUT: return "PIXMAN_OP_CONJOINT_OUT"; + case PIXMAN_OP_CONJOINT_OUT_REVERSE: return "PIXMAN_OP_CONJOINT_OUT_REVERSE"; + case PIXMAN_OP_CONJOINT_ATOP: return "PIXMAN_OP_CONJOINT_ATOP"; + case PIXMAN_OP_CONJOINT_ATOP_REVERSE: return "PIXMAN_OP_CONJOINT_ATOP_REVERSE"; + case PIXMAN_OP_CONJOINT_XOR: return "PIXMAN_OP_CONJOINT_XOR"; + + case PIXMAN_OP_MULTIPLY: return "PIXMAN_OP_MULTIPLY"; + case PIXMAN_OP_SCREEN: return "PIXMAN_OP_SCREEN"; + case PIXMAN_OP_OVERLAY: return "PIXMAN_OP_OVERLAY"; + case PIXMAN_OP_DARKEN: return "PIXMAN_OP_DARKEN"; + case PIXMAN_OP_LIGHTEN: return "PIXMAN_OP_LIGHTEN"; + case PIXMAN_OP_COLOR_DODGE: return "PIXMAN_OP_COLOR_DODGE"; + case PIXMAN_OP_COLOR_BURN: return "PIXMAN_OP_COLOR_BURN"; + case PIXMAN_OP_HARD_LIGHT: return "PIXMAN_OP_HARD_LIGHT"; + case PIXMAN_OP_SOFT_LIGHT: return "PIXMAN_OP_SOFT_LIGHT"; + case PIXMAN_OP_DIFFERENCE: return "PIXMAN_OP_DIFFERENCE"; + case PIXMAN_OP_EXCLUSION: return "PIXMAN_OP_EXCLUSION"; + case PIXMAN_OP_HSL_HUE: return "PIXMAN_OP_HSL_HUE"; + case PIXMAN_OP_HSL_SATURATION: return "PIXMAN_OP_HSL_SATURATION"; + case PIXMAN_OP_HSL_COLOR: return "PIXMAN_OP_HSL_COLOR"; + case PIXMAN_OP_HSL_LUMINOSITY: return "PIXMAN_OP_HSL_LUMINOSITY"; + + case PIXMAN_OP_NONE: + return "<invalid operator 'none'>"; + }; + + return "<unknown operator>"; +} + +const char * +format_name (pixman_format_code_t format) +{ + switch (format) + { +/* 32bpp formats */ + case PIXMAN_a8r8g8b8: return "a8r8g8b8"; + case PIXMAN_x8r8g8b8: return "x8r8g8b8"; + case PIXMAN_a8b8g8r8: return "a8b8g8r8"; + case PIXMAN_x8b8g8r8: return "x8b8g8r8"; + case PIXMAN_b8g8r8a8: return "b8g8r8a8"; + case PIXMAN_b8g8r8x8: return "b8g8r8x8"; + case PIXMAN_r8g8b8a8: return "r8g8b8a8"; + case PIXMAN_r8g8b8x8: return "r8g8b8x8"; + case PIXMAN_x14r6g6b6: return "x14r6g6b6"; + case PIXMAN_x2r10g10b10: return "x2r10g10b10"; + case PIXMAN_a2r10g10b10: return "a2r10g10b10"; + case PIXMAN_x2b10g10r10: return "x2b10g10r10"; + case PIXMAN_a2b10g10r10: return "a2b10g10r10"; + +/* sRGB formats */ + case PIXMAN_a8r8g8b8_sRGB: return "a8r8g8b8_sRGB"; + +/* 24bpp formats */ + case PIXMAN_r8g8b8: return "r8g8b8"; + case PIXMAN_b8g8r8: return "b8g8r8"; + +/* 16bpp formats */ + case PIXMAN_r5g6b5: return "r5g6b5"; + case PIXMAN_b5g6r5: return "b5g6r5"; + + case PIXMAN_a1r5g5b5: return "a1r5g5b5"; + case PIXMAN_x1r5g5b5: return "x1r5g5b5"; + case PIXMAN_a1b5g5r5: return "a1b5g5r5"; + case PIXMAN_x1b5g5r5: return "x1b5g5r5"; + case PIXMAN_a4r4g4b4: return "a4r4g4b4"; + case PIXMAN_x4r4g4b4: return "x4r4g4b4"; + case PIXMAN_a4b4g4r4: return "a4b4g4r4"; + case PIXMAN_x4b4g4r4: return "x4b4g4r4"; + +/* 8bpp formats */ + case PIXMAN_a8: return "a8"; + case PIXMAN_r3g3b2: return "r3g3b2"; + case PIXMAN_b2g3r3: return "b2g3r3"; + case PIXMAN_a2r2g2b2: return "a2r2g2b2"; + case PIXMAN_a2b2g2r2: return "a2b2g2r2"; + +#if 0 + case PIXMAN_x4c4: return "x4c4"; + case PIXMAN_g8: return "g8"; +#endif + case PIXMAN_c8: return "x4c4 / c8"; + case PIXMAN_x4g4: return "x4g4 / g8"; + + case PIXMAN_x4a4: return "x4a4"; + +/* 4bpp formats */ + case PIXMAN_a4: return "a4"; + case PIXMAN_r1g2b1: return "r1g2b1"; + case PIXMAN_b1g2r1: return "b1g2r1"; + case PIXMAN_a1r1g1b1: return "a1r1g1b1"; + case PIXMAN_a1b1g1r1: return "a1b1g1r1"; + + case PIXMAN_c4: return "c4"; + case PIXMAN_g4: return "g4"; + +/* 1bpp formats */ + case PIXMAN_a1: return "a1"; + + case PIXMAN_g1: return "g1"; + +/* YUV formats */ + case PIXMAN_yuy2: return "yuy2"; + case PIXMAN_yv12: return "yv12"; + }; + + /* Fake formats. + * + * This is separate switch to prevent GCC from complaining + * that the values are not in the pixman_format_code_t enum. + */ + switch ((uint32_t)format) + { + case PIXMAN_null: return "null"; + case PIXMAN_solid: return "solid"; + case PIXMAN_pixbuf: return "pixbuf"; + case PIXMAN_rpixbuf: return "rpixbuf"; + case PIXMAN_unknown: return "unknown"; + }; + + return "<unknown format>"; +}; + +static double +calc_op (pixman_op_t op, double src, double dst, double srca, double dsta) +{ +#define mult_chan(src, dst, Fa, Fb) MIN ((src) * (Fa) + (dst) * (Fb), 1.0) + + double Fa, Fb; + + switch (op) + { + case PIXMAN_OP_CLEAR: + case PIXMAN_OP_DISJOINT_CLEAR: + case PIXMAN_OP_CONJOINT_CLEAR: + return mult_chan (src, dst, 0.0, 0.0); + + case PIXMAN_OP_SRC: + case PIXMAN_OP_DISJOINT_SRC: + case PIXMAN_OP_CONJOINT_SRC: + return mult_chan (src, dst, 1.0, 0.0); + + case PIXMAN_OP_DST: + case PIXMAN_OP_DISJOINT_DST: + case PIXMAN_OP_CONJOINT_DST: + return mult_chan (src, dst, 0.0, 1.0); + + case PIXMAN_OP_OVER: + return mult_chan (src, dst, 1.0, 1.0 - srca); + + case PIXMAN_OP_OVER_REVERSE: + return mult_chan (src, dst, 1.0 - dsta, 1.0); + + case PIXMAN_OP_IN: + return mult_chan (src, dst, dsta, 0.0); + + case PIXMAN_OP_IN_REVERSE: + return mult_chan (src, dst, 0.0, srca); + + case PIXMAN_OP_OUT: + return mult_chan (src, dst, 1.0 - dsta, 0.0); + + case PIXMAN_OP_OUT_REVERSE: + return mult_chan (src, dst, 0.0, 1.0 - srca); + + case PIXMAN_OP_ATOP: + return mult_chan (src, dst, dsta, 1.0 - srca); + + case PIXMAN_OP_ATOP_REVERSE: + return mult_chan (src, dst, 1.0 - dsta, srca); + + case PIXMAN_OP_XOR: + return mult_chan (src, dst, 1.0 - dsta, 1.0 - srca); + + case PIXMAN_OP_ADD: + return mult_chan (src, dst, 1.0, 1.0); + + case PIXMAN_OP_SATURATE: + case PIXMAN_OP_DISJOINT_OVER_REVERSE: + if (srca == 0.0) + Fa = 1.0; + else + Fa = MIN (1.0, (1.0 - dsta) / srca); + return mult_chan (src, dst, Fa, 1.0); + + case PIXMAN_OP_DISJOINT_OVER: + if (dsta == 0.0) + Fb = 1.0; + else + Fb = MIN (1.0, (1.0 - srca) / dsta); + return mult_chan (src, dst, 1.0, Fb); + + case PIXMAN_OP_DISJOINT_IN: + if (srca == 0.0) + Fa = 0.0; + else + Fa = MAX (0.0, 1.0 - (1.0 - dsta) / srca); + return mult_chan (src, dst, Fa, 0.0); + + case PIXMAN_OP_DISJOINT_IN_REVERSE: + if (dsta == 0.0) + Fb = 0.0; + else + Fb = MAX (0.0, 1.0 - (1.0 - srca) / dsta); + return mult_chan (src, dst, 0.0, Fb); + + case PIXMAN_OP_DISJOINT_OUT: + if (srca == 0.0) + Fa = 1.0; + else + Fa = MIN (1.0, (1.0 - dsta) / srca); + return mult_chan (src, dst, Fa, 0.0); + + case PIXMAN_OP_DISJOINT_OUT_REVERSE: + if (dsta == 0.0) + Fb = 1.0; + else + Fb = MIN (1.0, (1.0 - srca) / dsta); + return mult_chan (src, dst, 0.0, Fb); + + case PIXMAN_OP_DISJOINT_ATOP: + if (srca == 0.0) + Fa = 0.0; + else + Fa = MAX (0.0, 1.0 - (1.0 - dsta) / srca); + if (dsta == 0.0) + Fb = 1.0; + else + Fb = MIN (1.0, (1.0 - srca) / dsta); + return mult_chan (src, dst, Fa, Fb); + + case PIXMAN_OP_DISJOINT_ATOP_REVERSE: + if (srca == 0.0) + Fa = 1.0; + else + Fa = MIN (1.0, (1.0 - dsta) / srca); + if (dsta == 0.0) + Fb = 0.0; + else + Fb = MAX (0.0, 1.0 - (1.0 - srca) / dsta); + return mult_chan (src, dst, Fa, Fb); + + case PIXMAN_OP_DISJOINT_XOR: + if (srca == 0.0) + Fa = 1.0; + else + Fa = MIN (1.0, (1.0 - dsta) / srca); + if (dsta == 0.0) + Fb = 1.0; + else + Fb = MIN (1.0, (1.0 - srca) / dsta); + return mult_chan (src, dst, Fa, Fb); + + case PIXMAN_OP_CONJOINT_OVER: + if (dsta == 0.0) + Fb = 0.0; + else + Fb = MAX (0.0, 1.0 - srca / dsta); + return mult_chan (src, dst, 1.0, Fb); + + case PIXMAN_OP_CONJOINT_OVER_REVERSE: + if (srca == 0.0) + Fa = 0.0; + else + Fa = MAX (0.0, 1.0 - dsta / srca); + return mult_chan (src, dst, Fa, 1.0); + + case PIXMAN_OP_CONJOINT_IN: + if (srca == 0.0) + Fa = 1.0; + else + Fa = MIN (1.0, dsta / srca); + return mult_chan (src, dst, Fa, 0.0); + + case PIXMAN_OP_CONJOINT_IN_REVERSE: + if (dsta == 0.0) + Fb = 1.0; + else + Fb = MIN (1.0, srca / dsta); + return mult_chan (src, dst, 0.0, Fb); + + case PIXMAN_OP_CONJOINT_OUT: + if (srca == 0.0) + Fa = 0.0; + else + Fa = MAX (0.0, 1.0 - dsta / srca); + return mult_chan (src, dst, Fa, 0.0); + + case PIXMAN_OP_CONJOINT_OUT_REVERSE: + if (dsta == 0.0) + Fb = 0.0; + else + Fb = MAX (0.0, 1.0 - srca / dsta); + return mult_chan (src, dst, 0.0, Fb); + + case PIXMAN_OP_CONJOINT_ATOP: + if (srca == 0.0) + Fa = 1.0; + else + Fa = MIN (1.0, dsta / srca); + if (dsta == 0.0) + Fb = 0.0; + else + Fb = MAX (0.0, 1.0 - srca / dsta); + return mult_chan (src, dst, Fa, Fb); + + case PIXMAN_OP_CONJOINT_ATOP_REVERSE: + if (srca == 0.0) + Fa = 0.0; + else + Fa = MAX (0.0, 1.0 - dsta / srca); + if (dsta == 0.0) + Fb = 1.0; + else + Fb = MIN (1.0, srca / dsta); + return mult_chan (src, dst, Fa, Fb); + + case PIXMAN_OP_CONJOINT_XOR: + if (srca == 0.0) + Fa = 0.0; + else + Fa = MAX (0.0, 1.0 - dsta / srca); + if (dsta == 0.0) + Fb = 0.0; + else + Fb = MAX (0.0, 1.0 - srca / dsta); + return mult_chan (src, dst, Fa, Fb); + + case PIXMAN_OP_MULTIPLY: + case PIXMAN_OP_SCREEN: + case PIXMAN_OP_OVERLAY: + case PIXMAN_OP_DARKEN: + case PIXMAN_OP_LIGHTEN: + case PIXMAN_OP_COLOR_DODGE: + case PIXMAN_OP_COLOR_BURN: + case PIXMAN_OP_HARD_LIGHT: + case PIXMAN_OP_SOFT_LIGHT: + case PIXMAN_OP_DIFFERENCE: + case PIXMAN_OP_EXCLUSION: + case PIXMAN_OP_HSL_HUE: + case PIXMAN_OP_HSL_SATURATION: + case PIXMAN_OP_HSL_COLOR: + case PIXMAN_OP_HSL_LUMINOSITY: + default: + abort(); + return 0; /* silence MSVC */ + } +#undef mult_chan +} + +void +do_composite (pixman_op_t op, + const color_t *src, + const color_t *mask, + const color_t *dst, + color_t *result, + pixman_bool_t component_alpha) +{ + color_t srcval, srcalpha; + + if (mask == NULL) + { + srcval = *src; + + srcalpha.r = src->a; + srcalpha.g = src->a; + srcalpha.b = src->a; + srcalpha.a = src->a; + } + else if (component_alpha) + { + srcval.r = src->r * mask->r; + srcval.g = src->g * mask->g; + srcval.b = src->b * mask->b; + srcval.a = src->a * mask->a; + + srcalpha.r = src->a * mask->r; + srcalpha.g = src->a * mask->g; + srcalpha.b = src->a * mask->b; + srcalpha.a = src->a * mask->a; + } + else + { + srcval.r = src->r * mask->a; + srcval.g = src->g * mask->a; + srcval.b = src->b * mask->a; + srcval.a = src->a * mask->a; + + srcalpha.r = src->a * mask->a; + srcalpha.g = src->a * mask->a; + srcalpha.b = src->a * mask->a; + srcalpha.a = src->a * mask->a; + } + + result->r = calc_op (op, srcval.r, dst->r, srcalpha.r, dst->a); + result->g = calc_op (op, srcval.g, dst->g, srcalpha.g, dst->a); + result->b = calc_op (op, srcval.b, dst->b, srcalpha.b, dst->a); + result->a = calc_op (op, srcval.a, dst->a, srcalpha.a, dst->a); +} + +static double +round_channel (double p, int m) +{ + int t; + double r; + + t = p * ((1 << m)); + t -= t >> m; + + r = t / (double)((1 << m) - 1); + + return r; +} + +void +round_color (pixman_format_code_t format, color_t *color) +{ + if (PIXMAN_FORMAT_R (format) == 0) + { + color->r = 0.0; + color->g = 0.0; + color->b = 0.0; + } + else + { + color->r = round_channel (color->r, PIXMAN_FORMAT_R (format)); + color->g = round_channel (color->g, PIXMAN_FORMAT_G (format)); + color->b = round_channel (color->b, PIXMAN_FORMAT_B (format)); + } + + if (PIXMAN_FORMAT_A (format) == 0) + color->a = 1; + else + color->a = round_channel (color->a, PIXMAN_FORMAT_A (format)); +} + +/* Check whether @pixel is a valid quantization of the a, r, g, b + * parameters. Some slack is permitted. + */ +void +pixel_checker_init (pixel_checker_t *checker, pixman_format_code_t format) +{ + assert (PIXMAN_FORMAT_VIS (format)); + + checker->format = format; + + switch (PIXMAN_FORMAT_TYPE (format)) + { + case PIXMAN_TYPE_A: + checker->bs = 0; + checker->gs = 0; + checker->rs = 0; + checker->as = 0; + break; + + case PIXMAN_TYPE_ARGB: + case PIXMAN_TYPE_ARGB_SRGB: + checker->bs = 0; + checker->gs = checker->bs + PIXMAN_FORMAT_B (format); + checker->rs = checker->gs + PIXMAN_FORMAT_G (format); + checker->as = checker->rs + PIXMAN_FORMAT_R (format); + break; + + case PIXMAN_TYPE_ABGR: + checker->rs = 0; + checker->gs = checker->rs + PIXMAN_FORMAT_R (format); + checker->bs = checker->gs + PIXMAN_FORMAT_G (format); + checker->as = checker->bs + PIXMAN_FORMAT_B (format); + break; + + case PIXMAN_TYPE_BGRA: + /* With BGRA formats we start counting at the high end of the pixel */ + checker->bs = PIXMAN_FORMAT_BPP (format) - PIXMAN_FORMAT_B (format); + checker->gs = checker->bs - PIXMAN_FORMAT_B (format); + checker->rs = checker->gs - PIXMAN_FORMAT_G (format); + checker->as = checker->rs - PIXMAN_FORMAT_R (format); + break; + + case PIXMAN_TYPE_RGBA: + /* With BGRA formats we start counting at the high end of the pixel */ + checker->rs = PIXMAN_FORMAT_BPP (format) - PIXMAN_FORMAT_R (format); + checker->gs = checker->rs - PIXMAN_FORMAT_R (format); + checker->bs = checker->gs - PIXMAN_FORMAT_G (format); + checker->as = checker->bs - PIXMAN_FORMAT_B (format); + break; + + default: + assert (0); + break; + } + + checker->am = ((1 << PIXMAN_FORMAT_A (format)) - 1) << checker->as; + checker->rm = ((1 << PIXMAN_FORMAT_R (format)) - 1) << checker->rs; + checker->gm = ((1 << PIXMAN_FORMAT_G (format)) - 1) << checker->gs; + checker->bm = ((1 << PIXMAN_FORMAT_B (format)) - 1) << checker->bs; + + checker->aw = PIXMAN_FORMAT_A (format); + checker->rw = PIXMAN_FORMAT_R (format); + checker->gw = PIXMAN_FORMAT_G (format); + checker->bw = PIXMAN_FORMAT_B (format); +} + +void +pixel_checker_split_pixel (const pixel_checker_t *checker, uint32_t pixel, + int *a, int *r, int *g, int *b) +{ + *a = (pixel & checker->am) >> checker->as; + *r = (pixel & checker->rm) >> checker->rs; + *g = (pixel & checker->gm) >> checker->gs; + *b = (pixel & checker->bm) >> checker->bs; +} + +void +pixel_checker_get_masks (const pixel_checker_t *checker, + uint32_t *am, + uint32_t *rm, + uint32_t *gm, + uint32_t *bm) +{ + if (am) + *am = checker->am; + if (rm) + *rm = checker->rm; + if (gm) + *gm = checker->gm; + if (bm) + *bm = checker->bm; +} + +void +pixel_checker_convert_pixel_to_color (const pixel_checker_t *checker, + uint32_t pixel, color_t *color) +{ + int a, r, g, b; + + pixel_checker_split_pixel (checker, pixel, &a, &r, &g, &b); + + if (checker->am == 0) + color->a = 1.0; + else + color->a = a / (double)(checker->am >> checker->as); + + if (checker->rm == 0) + color->r = 0.0; + else + color->r = r / (double)(checker->rm >> checker->rs); + + if (checker->gm == 0) + color->g = 0.0; + else + color->g = g / (double)(checker->gm >> checker->gs); + + if (checker->bm == 0) + color->b = 0.0; + else + color->b = b / (double)(checker->bm >> checker->bs); + + if (PIXMAN_FORMAT_TYPE (checker->format) == PIXMAN_TYPE_ARGB_SRGB) + { + color->r = convert_srgb_to_linear (color->r); + color->g = convert_srgb_to_linear (color->g); + color->b = convert_srgb_to_linear (color->b); + } +} + +static int32_t +convert (double v, uint32_t width, uint32_t mask, uint32_t shift, double def) +{ + int32_t r; + + if (!mask) + v = def; + + r = (v * ((mask >> shift) + 1)); + r -= r >> width; + + return r; +} + +static void +get_limits (const pixel_checker_t *checker, double limit, + color_t *color, + int *ao, int *ro, int *go, int *bo) +{ + color_t tmp; + + if (PIXMAN_FORMAT_TYPE (checker->format) == PIXMAN_TYPE_ARGB_SRGB) + { + tmp.a = color->a; + tmp.r = convert_linear_to_srgb (color->r); + tmp.g = convert_linear_to_srgb (color->g); + tmp.b = convert_linear_to_srgb (color->b); + + color = &tmp; + } + + *ao = convert (color->a + limit, checker->aw, checker->am, checker->as, 1.0); + *ro = convert (color->r + limit, checker->rw, checker->rm, checker->rs, 0.0); + *go = convert (color->g + limit, checker->gw, checker->gm, checker->gs, 0.0); + *bo = convert (color->b + limit, checker->bw, checker->bm, checker->bs, 0.0); +} + +/* The acceptable deviation in units of [0.0, 1.0] + */ +#define DEVIATION (0.0064) + +void +pixel_checker_get_max (const pixel_checker_t *checker, color_t *color, + int *am, int *rm, int *gm, int *bm) +{ + get_limits (checker, DEVIATION, color, am, rm, gm, bm); +} + +void +pixel_checker_get_min (const pixel_checker_t *checker, color_t *color, + int *am, int *rm, int *gm, int *bm) +{ + get_limits (checker, - DEVIATION, color, am, rm, gm, bm); +} + +pixman_bool_t +pixel_checker_check (const pixel_checker_t *checker, uint32_t pixel, + color_t *color) +{ + int32_t a_lo, a_hi, r_lo, r_hi, g_lo, g_hi, b_lo, b_hi; + int32_t ai, ri, gi, bi; + pixman_bool_t result; + + pixel_checker_get_min (checker, color, &a_lo, &r_lo, &g_lo, &b_lo); + pixel_checker_get_max (checker, color, &a_hi, &r_hi, &g_hi, &b_hi); + pixel_checker_split_pixel (checker, pixel, &ai, &ri, &gi, &bi); + + result = + a_lo <= ai && ai <= a_hi && + r_lo <= ri && ri <= r_hi && + g_lo <= gi && gi <= g_hi && + b_lo <= bi && bi <= b_hi; + + return result; +} |
