summaryrefslogtreecommitdiffstats
path: root/gfx/cairo/libpixman/src/pixman-utils.c
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/cairo/libpixman/src/pixman-utils.c')
-rw-r--r--gfx/cairo/libpixman/src/pixman-utils.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/gfx/cairo/libpixman/src/pixman-utils.c b/gfx/cairo/libpixman/src/pixman-utils.c
new file mode 100644
index 000000000..b2ffb8ca2
--- /dev/null
+++ b/gfx/cairo/libpixman/src/pixman-utils.c
@@ -0,0 +1,315 @@
+/*
+ * Copyright © 2000 SuSE, Inc.
+ * Copyright © 1999 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of SuSE not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. SuSE makes no representations about the
+ * suitability of this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ *
+ * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
+ * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Keith Packard, SuSE, Inc.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "pixman-private.h"
+
+pixman_bool_t
+_pixman_multiply_overflows_size (size_t a, size_t b)
+{
+ return a >= SIZE_MAX / b;
+}
+
+pixman_bool_t
+_pixman_multiply_overflows_int (unsigned int a, unsigned int b)
+{
+ return a >= INT32_MAX / b;
+}
+
+pixman_bool_t
+_pixman_addition_overflows_int (unsigned int a, unsigned int b)
+{
+ return a > INT32_MAX - b;
+}
+
+void *
+pixman_malloc_ab (unsigned int a,
+ unsigned int b)
+{
+ if (a >= INT32_MAX / b)
+ return NULL;
+
+ return malloc (a * b);
+}
+
+void *
+pixman_malloc_abc (unsigned int a,
+ unsigned int b,
+ unsigned int c)
+{
+ if (a >= INT32_MAX / b)
+ return NULL;
+ else if (a * b >= INT32_MAX / c)
+ return NULL;
+ else
+ return malloc (a * b * c);
+}
+
+static force_inline uint16_t
+float_to_unorm (float f, int n_bits)
+{
+ uint32_t u;
+
+ if (f > 1.0)
+ f = 1.0;
+ if (f < 0.0)
+ f = 0.0;
+
+ u = f * (1 << n_bits);
+ u -= (u >> n_bits);
+
+ return u;
+}
+
+static force_inline float
+unorm_to_float (uint16_t u, int n_bits)
+{
+ uint32_t m = ((1 << n_bits) - 1);
+
+ return (u & m) * (1.f / (float)m);
+}
+
+/*
+ * This function expands images from a8r8g8b8 to argb_t. To preserve
+ * precision, it needs to know from which source format the a8r8g8b8 pixels
+ * originally came.
+ *
+ * For example, if the source was PIXMAN_x1r5g5b5 and the red component
+ * contained bits 12345, then the 8-bit value is 12345123. To correctly
+ * expand this to floating point, it should be 12345 / 31.0 and not
+ * 12345123 / 255.0.
+ */
+void
+pixman_expand_to_float (argb_t *dst,
+ const uint32_t *src,
+ pixman_format_code_t format,
+ int width)
+{
+ static const float multipliers[16] = {
+ 0.0f,
+ 1.0f / ((1 << 1) - 1),
+ 1.0f / ((1 << 2) - 1),
+ 1.0f / ((1 << 3) - 1),
+ 1.0f / ((1 << 4) - 1),
+ 1.0f / ((1 << 5) - 1),
+ 1.0f / ((1 << 6) - 1),
+ 1.0f / ((1 << 7) - 1),
+ 1.0f / ((1 << 8) - 1),
+ 1.0f / ((1 << 9) - 1),
+ 1.0f / ((1 << 10) - 1),
+ 1.0f / ((1 << 11) - 1),
+ 1.0f / ((1 << 12) - 1),
+ 1.0f / ((1 << 13) - 1),
+ 1.0f / ((1 << 14) - 1),
+ 1.0f / ((1 << 15) - 1),
+ };
+ int a_size, r_size, g_size, b_size;
+ int a_shift, r_shift, g_shift, b_shift;
+ float a_mul, r_mul, g_mul, b_mul;
+ uint32_t a_mask, r_mask, g_mask, b_mask;
+ int i;
+
+ if (!PIXMAN_FORMAT_VIS (format))
+ format = PIXMAN_a8r8g8b8;
+
+ /*
+ * Determine the sizes of each component and the masks and shifts
+ * required to extract them from the source pixel.
+ */
+ a_size = PIXMAN_FORMAT_A (format);
+ r_size = PIXMAN_FORMAT_R (format);
+ g_size = PIXMAN_FORMAT_G (format);
+ b_size = PIXMAN_FORMAT_B (format);
+
+ a_shift = 32 - a_size;
+ r_shift = 24 - r_size;
+ g_shift = 16 - g_size;
+ b_shift = 8 - b_size;
+
+ a_mask = ((1 << a_size) - 1);
+ r_mask = ((1 << r_size) - 1);
+ g_mask = ((1 << g_size) - 1);
+ b_mask = ((1 << b_size) - 1);
+
+ a_mul = multipliers[a_size];
+ r_mul = multipliers[r_size];
+ g_mul = multipliers[g_size];
+ b_mul = multipliers[b_size];
+
+ /* Start at the end so that we can do the expansion in place
+ * when src == dst
+ */
+ for (i = width - 1; i >= 0; i--)
+ {
+ const uint32_t pixel = src[i];
+
+ dst[i].a = a_mask? ((pixel >> a_shift) & a_mask) * a_mul : 1.0f;
+ dst[i].r = ((pixel >> r_shift) & r_mask) * r_mul;
+ dst[i].g = ((pixel >> g_shift) & g_mask) * g_mul;
+ dst[i].b = ((pixel >> b_shift) & b_mask) * b_mul;
+ }
+}
+
+uint16_t
+pixman_float_to_unorm (float f, int n_bits)
+{
+ return float_to_unorm (f, n_bits);
+}
+
+float
+pixman_unorm_to_float (uint16_t u, int n_bits)
+{
+ return unorm_to_float (u, n_bits);
+}
+
+void
+pixman_contract_from_float (uint32_t *dst,
+ const argb_t *src,
+ int width)
+{
+ int i;
+
+ for (i = 0; i < width; ++i)
+ {
+ uint8_t a, r, g, b;
+
+ a = float_to_unorm (src[i].a, 8);
+ r = float_to_unorm (src[i].r, 8);
+ g = float_to_unorm (src[i].g, 8);
+ b = float_to_unorm (src[i].b, 8);
+
+ dst[i] = (a << 24) | (r << 16) | (g << 8) | (b << 0);
+ }
+}
+
+uint32_t *
+_pixman_iter_get_scanline_noop (pixman_iter_t *iter, const uint32_t *mask)
+{
+ return iter->buffer;
+}
+
+#define N_TMP_BOXES (16)
+
+pixman_bool_t
+pixman_region16_copy_from_region32 (pixman_region16_t *dst,
+ pixman_region32_t *src)
+{
+ int n_boxes, i;
+ pixman_box32_t *boxes32;
+ pixman_box16_t *boxes16;
+ pixman_bool_t retval;
+
+ boxes32 = pixman_region32_rectangles (src, &n_boxes);
+
+ boxes16 = pixman_malloc_ab (n_boxes, sizeof (pixman_box16_t));
+
+ if (!boxes16)
+ return FALSE;
+
+ for (i = 0; i < n_boxes; ++i)
+ {
+ boxes16[i].x1 = boxes32[i].x1;
+ boxes16[i].y1 = boxes32[i].y1;
+ boxes16[i].x2 = boxes32[i].x2;
+ boxes16[i].y2 = boxes32[i].y2;
+ }
+
+ pixman_region_fini (dst);
+ retval = pixman_region_init_rects (dst, boxes16, n_boxes);
+ free (boxes16);
+ return retval;
+}
+
+pixman_bool_t
+pixman_region32_copy_from_region16 (pixman_region32_t *dst,
+ pixman_region16_t *src)
+{
+ int n_boxes, i;
+ pixman_box16_t *boxes16;
+ pixman_box32_t *boxes32;
+ pixman_box32_t tmp_boxes[N_TMP_BOXES];
+ pixman_bool_t retval;
+
+ boxes16 = pixman_region_rectangles (src, &n_boxes);
+
+ if (n_boxes > N_TMP_BOXES)
+ boxes32 = pixman_malloc_ab (n_boxes, sizeof (pixman_box32_t));
+ else
+ boxes32 = tmp_boxes;
+
+ if (!boxes32)
+ return FALSE;
+
+ for (i = 0; i < n_boxes; ++i)
+ {
+ boxes32[i].x1 = boxes16[i].x1;
+ boxes32[i].y1 = boxes16[i].y1;
+ boxes32[i].x2 = boxes16[i].x2;
+ boxes32[i].y2 = boxes16[i].y2;
+ }
+
+ pixman_region32_fini (dst);
+ retval = pixman_region32_init_rects (dst, boxes32, n_boxes);
+
+ if (boxes32 != tmp_boxes)
+ free (boxes32);
+
+ return retval;
+}
+
+/* This function is exported for the sake of the test suite and not part
+ * of the ABI.
+ */
+PIXMAN_EXPORT pixman_implementation_t *
+_pixman_internal_only_get_implementation (void)
+{
+ return get_implementation ();
+}
+
+#ifdef DEBUG
+
+void
+_pixman_log_error (const char *function, const char *message)
+{
+ static int n_messages = 0;
+
+ if (n_messages < 10)
+ {
+ fprintf (stderr,
+ "*** BUG ***\n"
+ "In %s: %s\n"
+ "Set a breakpoint on '_pixman_log_error' to debug\n\n",
+ function, message);
+
+ n_messages++;
+ }
+}
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 00:01:30 +0000