+++ /dev/null
-/*
- * art_rgba.c: Functions for manipulating RGBA pixel data.
- *
- * Libart_LGPL - library of basic graphic primitives
- * Copyright (C) 2000 Raph Levien
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-#include <config.h>
-#include "art_misc.h"
-#include "art_rgba.h"
-
-#define ART_OPTIMIZE_SPACE
-
-#ifndef ART_OPTIMIZE_SPACE
-#include "art_rgba_table.c"
-#endif
-
-/**
- * art_rgba_rgba_composite: Composite RGBA image over RGBA buffer.
- * @dst: Destination RGBA buffer.
- * @src: Source RGBA buffer.
- * @n: Number of RGBA pixels to composite.
- *
- * Composites the RGBA pixels in @dst over the @src buffer.
- **/
-void
-art_rgba_rgba_composite (art_u8 *dst, const art_u8 *src, int n)
-{
- int i;
-#ifdef WORDS_BIGENDIAN
- art_u32 src_rgba, dst_rgba;
-#else
- art_u32 src_abgr, dst_abgr;
-#endif
- art_u8 src_alpha, dst_alpha;
-
- for (i = 0; i < n; i++)
- {
-#ifdef WORDS_BIGENDIAN
- src_rgba = ((art_u32 *)src)[i];
- src_alpha = src_rgba & 0xff;
-#else
- src_abgr = ((art_u32 *)src)[i];
- src_alpha = (src_abgr >> 24) & 0xff;
-#endif
- if (src_alpha)
- {
- if (src_alpha == 0xff ||
- (
-#ifdef WORDS_BIGENDIAN
- dst_rgba = ((art_u32 *)dst)[i],
- dst_alpha = dst_rgba & 0xff,
-#else
- dst_abgr = ((art_u32 *)dst)[i],
- dst_alpha = (dst_abgr >> 24),
-#endif
- dst_alpha == 0))
-#ifdef WORDS_BIGENDIAN
- ((art_u32 *)dst)[i] = src_rgba;
-#else
- ((art_u32 *)dst)[i] = src_abgr;
-#endif
- else
- {
- int r, g, b, a;
- int src_r, src_g, src_b;
- int dst_r, dst_g, dst_b;
- int tmp;
- int c;
-
-#ifdef ART_OPTIMIZE_SPACE
- tmp = (255 - src_alpha) * (255 - dst_alpha) + 0x80;
- a = 255 - ((tmp + (tmp >> 8)) >> 8);
- c = ((src_alpha << 16) + (a >> 1)) / a;
-#else
- tmp = art_rgba_composite_table[(src_alpha << 8) + dst_alpha];
- c = tmp & 0x1ffff;
- a = tmp >> 24;
-#endif
-#ifdef WORDS_BIGENDIAN
- src_r = (src_rgba >> 24) & 0xff;
- src_g = (src_rgba >> 16) & 0xff;
- src_b = (src_rgba >> 8) & 0xff;
- dst_r = (dst_rgba >> 24) & 0xff;
- dst_g = (dst_rgba >> 16) & 0xff;
- dst_b = (dst_rgba >> 8) & 0xff;
-#else
- src_r = src_abgr & 0xff;
- src_g = (src_abgr >> 8) & 0xff;
- src_b = (src_abgr >> 16) & 0xff;
- dst_r = dst_abgr & 0xff;
- dst_g = (dst_abgr >> 8) & 0xff;
- dst_b = (dst_abgr >> 16) & 0xff;
-#endif
- r = dst_r + (((src_r - dst_r) * c + 0x8000) >> 16);
- g = dst_g + (((src_g - dst_g) * c + 0x8000) >> 16);
- b = dst_b + (((src_b - dst_b) * c + 0x8000) >> 16);
-#ifdef WORDS_BIGENDIAN
- ((art_u32 *)dst)[i] = (r << 24) | (g << 16) | (b << 8) | a;
-#else
- ((art_u32 *)dst)[i] = (a << 24) | (b << 16) | (g << 8) | r;
-#endif
- }
- }
-#if 0
- /* it's not clear to me this optimization really wins */
- else
- {
- /* skip over run of transparent pixels */
- for (; i < n - 1; i++)
- {
-#ifdef WORDS_BIGENDIAN
- src_rgba = ((art_u32 *)src)[i + 1];
- if (src_rgba & 0xff)
- break;
-#else
- src_abgr = ((art_u32 *)src)[i + 1];
- if (src_abgr & 0xff000000)
- break;
-#endif
- }
- }
-#endif
- }
-}
-
-/**
- * art_rgba_fill_run: fill an RGBA buffer a solid RGB color.
- * @buf: Buffer to fill.
- * @r: Red, range 0..255.
- * @g: Green, range 0..255.
- * @b: Blue, range 0..255.
- * @n: Number of RGB triples to fill.
- *
- * Fills a buffer with @n copies of the (@r, @g, @b) triple, solid
- * alpha. Thus, locations @buf (inclusive) through @buf + 4 * @n
- * (exclusive) are written.
- **/
-void
-art_rgba_fill_run (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int n)
-{
- int i;
-#ifdef WORDS_BIGENDIAN
- art_u32 src_rgba;
-#else
- art_u32 src_abgr;
-#endif
-
-#ifdef WORDS_BIGENDIAN
- src_rgba = (r << 24) | (g << 16) | (b << 8) | 255;
-#else
- src_abgr = (255 << 24) | (b << 16) | (g << 8) | r;
-#endif
- for (i = 0; i < n; i++)
- {
-#ifdef WORDS_BIGENDIAN
- ((art_u32 *)buf)[i] = src_rgba;
-#else
- ((art_u32 *)buf)[i] = src_abgr;
-#endif
- }
-}
-
-/**
- * art_rgba_run_alpha: Render semitransparent color over RGBA buffer.
- * @buf: Buffer for rendering.
- * @r: Red, range 0..255.
- * @g: Green, range 0..255.
- * @b: Blue, range 0..255.
- * @alpha: Alpha, range 0..255.
- * @n: Number of RGB triples to render.
- *
- * Renders a sequential run of solid (@r, @g, @b) color over @buf with
- * opacity @alpha. Note that the range of @alpha is 0..255, in contrast
- * to art_rgb_run_alpha, which has a range of 0..256.
- **/
-void
-art_rgba_run_alpha (art_u8 *buf, art_u8 r, art_u8 g, art_u8 b, int alpha, int n)
-{
- int i;
-#ifdef WORDS_BIGENDIAN
- art_u32 src_rgba, dst_rgba;
-#else
- art_u32 src_abgr, dst_abgr;
-#endif
- art_u8 dst_alpha;
- int a;
- int dst_r, dst_g, dst_b;
- int tmp;
- int c;
-
-#ifdef WORDS_BIGENDIAN
- src_rgba = (r << 24) | (g << 16) | (b << 8) | alpha;
-#else
- src_abgr = (alpha << 24) | (b << 16) | (g << 8) | r;
-#endif
- for (i = 0; i < n; i++)
- {
-#ifdef WORDS_BIGENDIAN
- dst_rgba = ((art_u32 *)buf)[i];
- dst_alpha = dst_rgba & 0xff;
-#else
- dst_abgr = ((art_u32 *)buf)[i];
- dst_alpha = (dst_abgr >> 24) & 0xff;
-#endif
- if (dst_alpha)
- {
-#ifdef ART_OPTIMIZE_SPACE
- tmp = (255 - alpha) * (255 - dst_alpha) + 0x80;
- a = 255 - ((tmp + (tmp >> 8)) >> 8);
- c = ((alpha << 16) + (a >> 1)) / a;
-#else
- tmp = art_rgba_composite_table[(alpha << 8) + dst_alpha];
- c = tmp & 0x1ffff;
- a = tmp >> 24;
-#endif
-#ifdef WORDS_BIGENDIAN
- dst_r = (dst_rgba >> 24) & 0xff;
- dst_g = (dst_rgba >> 16) & 0xff;
- dst_b = (dst_rgba >> 8) & 0xff;
-#else
- dst_r = dst_abgr & 0xff;
- dst_g = (dst_abgr >> 8) & 0xff;
- dst_b = (dst_abgr >> 16) & 0xff;
-#endif
- dst_r += (((r - dst_r) * c + 0x8000) >> 16);
- dst_g += (((g - dst_g) * c + 0x8000) >> 16);
- dst_b += (((b - dst_b) * c + 0x8000) >> 16);
-#ifdef WORDS_BIGENDIAN
- ((art_u32 *)buf)[i] = (dst_r << 24) | (dst_g << 16) | (dst_b << 8) | a;
-#else
- ((art_u32 *)buf)[i] = (a << 24) | (dst_b << 16) | (dst_g << 8) | dst_r;
-#endif
- }
- else
- {
-#ifdef WORDS_BIGENDIAN
- ((art_u32 *)buf)[i] = src_rgba;
-#else
- ((art_u32 *)buf)[i] = src_abgr;
-#endif
- }
- }
-}
projects / rrdtool.git / blobdiff