Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 264 insertions, 0 deletions

diff --git a/gfx/cairo/libpixman/src/pixman-gradient-walker.c b/gfx/cairo/libpixman/src/pixman-gradient-walker.c
new file mode 100644
index 0000000000..fb7f401dac
--- /dev/null
+++ b/gfx/cairo/libpixman/src/pixman-gradient-walker.c
@@ -0,0 +1,264 @@
+/*
+ *
+ * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
+ *             2005 Lars Knoll & Zack Rusin, Trolltech
+ *
+ * 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 Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Keith Packard makes no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "pixman-private.h"
+
+void
+_pixman_gradient_walker_init (pixman_gradient_walker_t *walker,
+                              gradient_t *              gradient,
+                              pixman_repeat_t		repeat)
+{
+    walker->num_stops = gradient->n_stops;
+    walker->stops     = gradient->stops;
+    walker->left_x    = 0;
+    walker->right_x   = 0x10000;
+    walker->a_s       = 0.0f;
+    walker->a_b       = 0.0f;
+    walker->r_s       = 0.0f;
+    walker->r_b       = 0.0f;
+    walker->g_s       = 0.0f;
+    walker->g_b       = 0.0f;
+    walker->b_s       = 0.0f;
+    walker->b_b       = 0.0f;
+    walker->repeat    = repeat;
+
+    walker->need_reset = TRUE;
+}
+
+static void
+gradient_walker_reset (pixman_gradient_walker_t *walker,
+		       pixman_fixed_48_16_t      pos)
+{
+    int64_t x, left_x, right_x;
+    pixman_color_t *left_c, *right_c;
+    int n, count = walker->num_stops;
+    pixman_gradient_stop_t *stops = walker->stops;
+    float la, lr, lg, lb;
+    float ra, rr, rg, rb;
+    float lx, rx;
+
+    if (walker->repeat == PIXMAN_REPEAT_NORMAL)
+    {
+	x = (int32_t)pos & 0xffff;
+    }
+    else if (walker->repeat == PIXMAN_REPEAT_REFLECT)
+    {
+	x = (int32_t)pos & 0xffff;
+	if ((int32_t)pos & 0x10000)
+	    x = 0x10000 - x;
+    }
+    else
+    {
+	x = pos;
+    }
+    
+    for (n = 0; n < count; n++)
+    {
+	if (x < stops[n].x)
+	    break;
+    }
+    
+    left_x =  stops[n - 1].x;
+    left_c = &stops[n - 1].color;
+    
+    right_x =  stops[n].x;
+    right_c = &stops[n].color;
+
+    if (walker->repeat == PIXMAN_REPEAT_NORMAL)
+    {
+	left_x  += (pos - x);
+	right_x += (pos - x);
+    }
+    else if (walker->repeat == PIXMAN_REPEAT_REFLECT)
+    {
+	if ((int32_t)pos & 0x10000)
+	{
+	    pixman_color_t  *tmp_c;
+	    int32_t tmp_x;
+
+	    tmp_x   = 0x10000 - right_x;
+	    right_x = 0x10000 - left_x;
+	    left_x  = tmp_x;
+
+	    tmp_c   = right_c;
+	    right_c = left_c;
+	    left_c  = tmp_c;
+
+	    x = 0x10000 - x;
+	}
+	left_x  += (pos - x);
+	right_x += (pos - x);
+    }
+    else if (walker->repeat == PIXMAN_REPEAT_NONE)
+    {
+	if (n == 0)
+	    right_c = left_c;
+	else if (n == count)
+	    left_c = right_c;
+    }
+
+    /* The alpha/red/green/blue channels are scaled to be in [0, 1].
+     * This ensures that after premultiplication all channels will
+     * be in the [0, 1] interval.
+     */
+    la = (left_c->alpha * (1.0f/257.0f));
+    lr = (left_c->red * (1.0f/257.0f));
+    lg = (left_c->green * (1.0f/257.0f));
+    lb = (left_c->blue * (1.0f/257.0f));
+
+    ra = (right_c->alpha * (1.0f/257.0f));
+    rr = (right_c->red * (1.0f/257.0f));
+    rg = (right_c->green * (1.0f/257.0f));
+    rb = (right_c->blue * (1.0f/257.0f));
+    
+    lx = left_x * (1.0f/65536.0f);
+    rx = right_x * (1.0f/65536.0f);
+    
+    if (FLOAT_IS_ZERO (rx - lx) || left_x == INT32_MIN || right_x == INT32_MAX)
+    {
+	walker->a_s = walker->r_s = walker->g_s = walker->b_s = 0.0f;
+	walker->a_b = (la + ra) / 510.0f;
+	walker->r_b = (lr + rr) / 510.0f;
+	walker->g_b = (lg + rg) / 510.0f;
+	walker->b_b = (lb + rb) / 510.0f;
+    }
+    else
+    {
+	float w_rec = 1.0f / (rx - lx);
+
+	walker->a_b = (la * rx - ra * lx) * w_rec * (1.0f/255.0f);
+	walker->r_b = (lr * rx - rr * lx) * w_rec * (1.0f/255.0f);
+	walker->g_b = (lg * rx - rg * lx) * w_rec * (1.0f/255.0f);
+	walker->b_b = (lb * rx - rb * lx) * w_rec * (1.0f/255.0f);
+
+	walker->a_s = (ra - la) * w_rec * (1.0f/255.0f);
+	walker->r_s = (rr - lr) * w_rec * (1.0f/255.0f);
+	walker->g_s = (rg - lg) * w_rec * (1.0f/255.0f);
+	walker->b_s = (rb - lb) * w_rec * (1.0f/255.0f);
+    }
+   
+    walker->left_x = left_x;
+    walker->right_x = right_x;
+
+    walker->need_reset = FALSE;
+}
+
+static argb_t
+pixman_gradient_walker_pixel_float (pixman_gradient_walker_t *walker,
+				    pixman_fixed_48_16_t      x)
+{
+    argb_t f;
+    float y;
+
+    if (walker->need_reset || x < walker->left_x || x >= walker->right_x)
+	gradient_walker_reset (walker, x);
+
+    y = x * (1.0f / 65536.0f);
+
+    f.a = walker->a_s * y + walker->a_b;
+    f.r = f.a * (walker->r_s * y + walker->r_b);
+    f.g = f.a * (walker->g_s * y + walker->g_b);
+    f.b = f.a * (walker->b_s * y + walker->b_b);
+
+    return f;
+}
+
+static uint32_t
+pixman_gradient_walker_pixel_32 (pixman_gradient_walker_t *walker,
+				 pixman_fixed_48_16_t      x)
+{
+    argb_t f;
+    float y;
+
+    if (walker->need_reset || x < walker->left_x || x >= walker->right_x)
+	gradient_walker_reset (walker, x);
+
+    y = x * (1.0f / 65536.0f);
+
+    /* Instead of [0...1] for ARGB, we want [0...255],
+     * multiply alpha with 255 and the color channels
+     * also get multiplied by the alpha multiplier.
+     *
+     * We don't use pixman_contract_from_float because it causes a 2x
+     * slowdown to do so, and the values are already normalized,
+     * so we don't have to worry about values < 0.f or > 1.f
+     */
+    f.a = 255.f * (walker->a_s * y + walker->a_b);
+    f.r = f.a * (walker->r_s * y + walker->r_b);
+    f.g = f.a * (walker->g_s * y + walker->g_b);
+    f.b = f.a * (walker->b_s * y + walker->b_b);
+
+    return (((uint32_t)(f.a + .5f) << 24) & 0xff000000) |
+           (((uint32_t)(f.r + .5f) << 16) & 0x00ff0000) |
+           (((uint32_t)(f.g + .5f) <<  8) & 0x0000ff00) |
+           (((uint32_t)(f.b + .5f) >>  0) & 0x000000ff);
+}
+
+void
+_pixman_gradient_walker_write_narrow (pixman_gradient_walker_t *walker,
+				      pixman_fixed_48_16_t      x,
+				      uint32_t                 *buffer)
+{
+    *buffer = pixman_gradient_walker_pixel_32 (walker, x);
+}
+
+void
+_pixman_gradient_walker_write_wide (pixman_gradient_walker_t *walker,
+				    pixman_fixed_48_16_t      x,
+				    uint32_t                 *buffer)
+{
+    *(argb_t *)buffer = pixman_gradient_walker_pixel_float (walker, x);
+}
+
+void
+_pixman_gradient_walker_fill_narrow (pixman_gradient_walker_t *walker,
+				     pixman_fixed_48_16_t      x,
+				     uint32_t                 *buffer,
+				     uint32_t                 *end)
+{
+    register uint32_t color;
+
+    color = pixman_gradient_walker_pixel_32 (walker, x);
+    while (buffer < end)
+	*buffer++ = color;
+}
+
+void
+_pixman_gradient_walker_fill_wide (pixman_gradient_walker_t *walker,
+				   pixman_fixed_48_16_t      x,
+				   uint32_t                 *buffer,
+				   uint32_t                 *end)
+{
+    register argb_t color;
+    argb_t *buffer_wide = (argb_t *)buffer;
+    argb_t *end_wide    = (argb_t *)end;
+
+    color = pixman_gradient_walker_pixel_float (walker, x);
+    while (buffer_wide < end_wide)
+	*buffer_wide++ = color;
+}