311 lines
7.3 KiB
C
311 lines
7.3 KiB
C
/*
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* Copyright © 2000 SuSE, Inc.
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* Copyright © 1999 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of SuSE not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. SuSE makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
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* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Keith Packard, SuSE, Inc.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include "pixman-private.h"
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pixman_bool_t
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_pixman_multiply_overflows_size (size_t a, size_t b)
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{
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return a >= SIZE_MAX / b;
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}
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pixman_bool_t
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_pixman_multiply_overflows_int (unsigned int a, unsigned int b)
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{
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return a >= INT32_MAX / b;
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}
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pixman_bool_t
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_pixman_addition_overflows_int (unsigned int a, unsigned int b)
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{
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return a > INT32_MAX - b;
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}
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void *
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pixman_malloc_ab (unsigned int a,
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unsigned int b)
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{
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if (a >= INT32_MAX / b)
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return NULL;
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return malloc (a * b);
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}
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void *
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pixman_malloc_abc (unsigned int a,
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unsigned int b,
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unsigned int c)
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{
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if (a >= INT32_MAX / b)
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return NULL;
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else if (a * b >= INT32_MAX / c)
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return NULL;
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else
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return malloc (a * b * c);
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}
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static force_inline uint16_t
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float_to_unorm (float f, int n_bits)
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{
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uint32_t u;
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if (f > 1.0)
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f = 1.0;
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if (f < 0.0)
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f = 0.0;
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u = f * (1 << n_bits);
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u -= (u >> n_bits);
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return u;
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}
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static force_inline float
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unorm_to_float (uint16_t u, int n_bits)
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{
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uint32_t m = ((1 << n_bits) - 1);
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return (u & m) * (1.f / (float)m);
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}
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/*
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* This function expands images from a8r8g8b8 to argb_t. To preserve
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* precision, it needs to know from which source format the a8r8g8b8 pixels
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* originally came.
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*
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* For example, if the source was PIXMAN_x1r5g5b5 and the red component
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* contained bits 12345, then the 8-bit value is 12345123. To correctly
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* expand this to floating point, it should be 12345 / 31.0 and not
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* 12345123 / 255.0.
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*/
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void
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pixman_expand_to_float (argb_t *dst,
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const uint32_t *src,
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pixman_format_code_t format,
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int width)
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{
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static const float multipliers[16] = {
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0.0f,
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1.0f / ((1 << 1) - 1),
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1.0f / ((1 << 2) - 1),
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1.0f / ((1 << 3) - 1),
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1.0f / ((1 << 4) - 1),
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1.0f / ((1 << 5) - 1),
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1.0f / ((1 << 6) - 1),
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1.0f / ((1 << 7) - 1),
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1.0f / ((1 << 8) - 1),
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1.0f / ((1 << 9) - 1),
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1.0f / ((1 << 10) - 1),
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1.0f / ((1 << 11) - 1),
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1.0f / ((1 << 12) - 1),
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1.0f / ((1 << 13) - 1),
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1.0f / ((1 << 14) - 1),
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1.0f / ((1 << 15) - 1),
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};
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int a_size, r_size, g_size, b_size;
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int a_shift, r_shift, g_shift, b_shift;
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float a_mul, r_mul, g_mul, b_mul;
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uint32_t a_mask, r_mask, g_mask, b_mask;
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int i;
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if (!PIXMAN_FORMAT_VIS (format))
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format = PIXMAN_a8r8g8b8;
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/*
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* Determine the sizes of each component and the masks and shifts
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* required to extract them from the source pixel.
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*/
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a_size = PIXMAN_FORMAT_A (format);
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r_size = PIXMAN_FORMAT_R (format);
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g_size = PIXMAN_FORMAT_G (format);
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b_size = PIXMAN_FORMAT_B (format);
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a_shift = 32 - a_size;
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r_shift = 24 - r_size;
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g_shift = 16 - g_size;
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b_shift = 8 - b_size;
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a_mask = ((1 << a_size) - 1);
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r_mask = ((1 << r_size) - 1);
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g_mask = ((1 << g_size) - 1);
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b_mask = ((1 << b_size) - 1);
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a_mul = multipliers[a_size];
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r_mul = multipliers[r_size];
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g_mul = multipliers[g_size];
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b_mul = multipliers[b_size];
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/* Start at the end so that we can do the expansion in place
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* when src == dst
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*/
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for (i = width - 1; i >= 0; i--)
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{
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const uint32_t pixel = src[i];
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dst[i].a = a_mask? ((pixel >> a_shift) & a_mask) * a_mul : 1.0f;
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dst[i].r = ((pixel >> r_shift) & r_mask) * r_mul;
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dst[i].g = ((pixel >> g_shift) & g_mask) * g_mul;
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dst[i].b = ((pixel >> b_shift) & b_mask) * b_mul;
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}
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}
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uint16_t
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pixman_float_to_unorm (float f, int n_bits)
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{
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return float_to_unorm (f, n_bits);
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}
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float
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pixman_unorm_to_float (uint16_t u, int n_bits)
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{
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return unorm_to_float (u, n_bits);
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}
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void
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pixman_contract_from_float (uint32_t *dst,
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const argb_t *src,
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int width)
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{
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int i;
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for (i = 0; i < width; ++i)
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{
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uint8_t a, r, g, b;
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a = float_to_unorm (src[i].a, 8);
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r = float_to_unorm (src[i].r, 8);
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g = float_to_unorm (src[i].g, 8);
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b = float_to_unorm (src[i].b, 8);
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dst[i] = (a << 24) | (r << 16) | (g << 8) | (b << 0);
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}
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}
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uint32_t *
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_pixman_iter_get_scanline_noop (pixman_iter_t *iter, const uint32_t *mask)
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{
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return iter->buffer;
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}
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#define N_TMP_BOXES (16)
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pixman_bool_t
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pixman_region16_copy_from_region32 (pixman_region16_t *dst,
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pixman_region32_t *src)
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{
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int n_boxes, i;
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pixman_box32_t *boxes32;
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pixman_box16_t *boxes16;
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pixman_bool_t retval;
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boxes32 = pixman_region32_rectangles (src, &n_boxes);
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boxes16 = pixman_malloc_ab (n_boxes, sizeof (pixman_box16_t));
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if (!boxes16)
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return FALSE;
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for (i = 0; i < n_boxes; ++i)
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{
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boxes16[i].x1 = boxes32[i].x1;
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boxes16[i].y1 = boxes32[i].y1;
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boxes16[i].x2 = boxes32[i].x2;
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boxes16[i].y2 = boxes32[i].y2;
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}
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pixman_region_fini (dst);
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retval = pixman_region_init_rects (dst, boxes16, n_boxes);
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free (boxes16);
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return retval;
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}
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pixman_bool_t
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pixman_region32_copy_from_region16 (pixman_region32_t *dst,
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pixman_region16_t *src)
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{
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int n_boxes, i;
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pixman_box16_t *boxes16;
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pixman_box32_t *boxes32;
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pixman_box32_t tmp_boxes[N_TMP_BOXES];
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pixman_bool_t retval;
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boxes16 = pixman_region_rectangles (src, &n_boxes);
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if (n_boxes > N_TMP_BOXES)
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boxes32 = pixman_malloc_ab (n_boxes, sizeof (pixman_box32_t));
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else
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boxes32 = tmp_boxes;
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if (!boxes32)
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return FALSE;
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for (i = 0; i < n_boxes; ++i)
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{
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boxes32[i].x1 = boxes16[i].x1;
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boxes32[i].y1 = boxes16[i].y1;
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boxes32[i].x2 = boxes16[i].x2;
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boxes32[i].y2 = boxes16[i].y2;
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}
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pixman_region32_fini (dst);
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retval = pixman_region32_init_rects (dst, boxes32, n_boxes);
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if (boxes32 != tmp_boxes)
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free (boxes32);
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return retval;
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}
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/* This function is exported for the sake of the test suite and not part
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* of the ABI.
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*/
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PIXMAN_EXPORT pixman_implementation_t *
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_pixman_internal_only_get_implementation (void)
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{
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return get_implementation ();
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}
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void
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_pixman_log_error (const char *function, const char *message)
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{
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static int n_messages = 0;
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if (n_messages < 10)
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{
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fprintf (stderr,
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"*** BUG ***\n"
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"In %s: %s\n"
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"Set a breakpoint on '_pixman_log_error' to debug\n\n",
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function, message);
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n_messages++;
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}
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}
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