--- /dev/null
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 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.
+ */
+
+/* Render a sorted vector path into an RGB buffer. */
+
+#include "config.h"
+#include "art_rgb_svp.h"
+
+#include "art_svp.h"
+#include "art_svp_render_aa.h"
+#include "art_rgb.h"
+
+typedef struct _ArtRgbSVPData ArtRgbSVPData;
+typedef struct _ArtRgbSVPAlphaData ArtRgbSVPAlphaData;
+
+struct _ArtRgbSVPData {
+ art_u32 rgbtab[256];
+ art_u8 *buf;
+ int rowstride;
+ int x0, x1;
+};
+
+struct _ArtRgbSVPAlphaData {
+ int alphatab[256];
+ art_u8 r, g, b, alpha;
+ art_u8 *buf;
+ int rowstride;
+ int x0, x1;
+};
+
+static void
+art_rgb_svp_callback (void *callback_data, int y,
+ int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+ ArtRgbSVPData *data = (ArtRgbSVPData *)callback_data;
+ art_u8 *linebuf;
+ int run_x0, run_x1;
+ art_u32 running_sum = start;
+ art_u32 rgb;
+ int x0, x1;
+ int k;
+
+ linebuf = data->buf;
+ x0 = data->x0;
+ x1 = data->x1;
+
+ if (n_steps > 0)
+ {
+ run_x1 = steps[0].x;
+ if (run_x1 > x0)
+ {
+ rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+ art_rgb_fill_run (linebuf,
+ rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+ run_x1 - x0);
+ }
+
+ for (k = 0; k < n_steps - 1; k++)
+ {
+ running_sum += steps[k].delta;
+ run_x0 = run_x1;
+ run_x1 = steps[k + 1].x;
+ if (run_x1 > run_x0)
+ {
+ rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+ art_rgb_fill_run (linebuf + (run_x0 - x0) * 3,
+ rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+ run_x1 - run_x0);
+ }
+ }
+ running_sum += steps[k].delta;
+ if (x1 > run_x1)
+ {
+ rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+ art_rgb_fill_run (linebuf + (run_x1 - x0) * 3,
+ rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+ x1 - run_x1);
+ }
+ }
+ else
+ {
+ rgb = data->rgbtab[(running_sum >> 16) & 0xff];
+ art_rgb_fill_run (linebuf,
+ rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
+ x1 - x0);
+ }
+
+ data->buf += data->rowstride;
+}
+
+/* Render the vector path into the RGB buffer. */
+
+/**
+ * art_rgb_svp_aa: Render sorted vector path into RGB buffer.
+ * @svp: The source sorted vector path.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @fg_color: Foreground color in 0xRRGGBB format.
+ * @bg_color: Background color in 0xRRGGBB format.
+ * @buf: Destination RGB buffer.
+ * @rowstride: Rowstride of @buf buffer.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the rendering.
+ *
+ * Renders the shape specified with @svp into the @buf RGB buffer.
+ * @x1 - @x0 specifies the width, and @y1 - @y0 specifies the height,
+ * of the rectangle rendered. The new pixels are stored starting at
+ * the first byte of @buf. Thus, the @x0 and @y0 parameters specify
+ * an offset within @svp, and may be tweaked as a way of doing
+ * integer-pixel translations without fiddling with @svp itself.
+ *
+ * The @fg_color and @bg_color arguments specify the opaque colors to
+ * be used for rendering. For pixels of entirely 0 winding-number,
+ * @bg_color is used. For pixels of entirely 1 winding number,
+ * @fg_color is used. In between, the color is interpolated based on
+ * the fraction of the pixel with a winding number of 1. If
+ * @alphagamma is NULL, then linear interpolation (in pixel counts) is
+ * the default. Otherwise, the interpolation is as specified by
+ * @alphagamma.
+ **/
+void
+art_rgb_svp_aa (const ArtSVP *svp,
+ int x0, int y0, int x1, int y1,
+ art_u32 fg_color, art_u32 bg_color,
+ art_u8 *buf, int rowstride,
+ ArtAlphaGamma *alphagamma)
+{
+ ArtRgbSVPData data;
+
+ int r_fg, g_fg, b_fg;
+ int r_bg, g_bg, b_bg;
+ int r, g, b;
+ int dr, dg, db;
+ int i;
+
+ if (alphagamma == NULL)
+ {
+ r_fg = fg_color >> 16;
+ g_fg = (fg_color >> 8) & 0xff;
+ b_fg = fg_color & 0xff;
+
+ r_bg = bg_color >> 16;
+ g_bg = (bg_color >> 8) & 0xff;
+ b_bg = bg_color & 0xff;
+
+ r = (r_bg << 16) + 0x8000;
+ g = (g_bg << 16) + 0x8000;
+ b = (b_bg << 16) + 0x8000;
+ dr = ((r_fg - r_bg) << 16) / 255;
+ dg = ((g_fg - g_bg) << 16) / 255;
+ db = ((b_fg - b_bg) << 16) / 255;
+
+ for (i = 0; i < 256; i++)
+ {
+ data.rgbtab[i] = (r & 0xff0000) | ((g & 0xff0000) >> 8) | (b >> 16);
+ r += dr;
+ g += dg;
+ b += db;
+ }
+ }
+ else
+ {
+ int *table;
+ art_u8 *invtab;
+
+ table = alphagamma->table;
+
+ r_fg = table[fg_color >> 16];
+ g_fg = table[(fg_color >> 8) & 0xff];
+ b_fg = table[fg_color & 0xff];
+
+ r_bg = table[bg_color >> 16];
+ g_bg = table[(bg_color >> 8) & 0xff];
+ b_bg = table[bg_color & 0xff];
+
+ r = (r_bg << 16) + 0x8000;
+ g = (g_bg << 16) + 0x8000;
+ b = (b_bg << 16) + 0x8000;
+ dr = ((r_fg - r_bg) << 16) / 255;
+ dg = ((g_fg - g_bg) << 16) / 255;
+ db = ((b_fg - b_bg) << 16) / 255;
+
+ invtab = alphagamma->invtable;
+ for (i = 0; i < 256; i++)
+ {
+ data.rgbtab[i] = (invtab[r >> 16] << 16) |
+ (invtab[g >> 16] << 8) |
+ invtab[b >> 16];
+ r += dr;
+ g += dg;
+ b += db;
+ }
+ }
+ data.buf = buf;
+ data.rowstride = rowstride;
+ data.x0 = x0;
+ data.x1 = x1;
+ art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_callback, &data);
+}
+
+static void
+art_rgb_svp_alpha_callback (void *callback_data, int y,
+ int start, ArtSVPRenderAAStep *steps, int n_steps)
+{
+ ArtRgbSVPAlphaData *data = (ArtRgbSVPAlphaData *)callback_data;
+ art_u8 *linebuf;
+ int run_x0, run_x1;
+ art_u32 running_sum = start;
+ int x0, x1;
+ int k;
+ art_u8 r, g, b;
+ int *alphatab;
+ int alpha;
+
+ linebuf = data->buf;
+ x0 = data->x0;
+ x1 = data->x1;
+
+ r = data->r;
+ g = data->g;
+ b = data->b;
+ alphatab = data->alphatab;
+
+ if (n_steps > 0)
+ {
+ run_x1 = steps[0].x;
+ if (run_x1 > x0)
+ {
+ alpha = (running_sum >> 16) & 0xff;
+ if (alpha)
+ art_rgb_run_alpha (linebuf,
+ r, g, b, alphatab[alpha],
+ run_x1 - x0);
+ }
+
+ for (k = 0; k < n_steps - 1; k++)
+ {
+ running_sum += steps[k].delta;
+ run_x0 = run_x1;
+ run_x1 = steps[k + 1].x;
+ if (run_x1 > run_x0)
+ {
+ alpha = (running_sum >> 16) & 0xff;
+ if (alpha)
+ art_rgb_run_alpha (linebuf + (run_x0 - x0) * 3,
+ r, g, b, alphatab[alpha],
+ run_x1 - run_x0);
+ }
+ }
+ running_sum += steps[k].delta;
+ if (x1 > run_x1)
+ {
+ alpha = (running_sum >> 16) & 0xff;
+ if (alpha)
+ art_rgb_run_alpha (linebuf + (run_x1 - x0) * 3,
+ r, g, b, alphatab[alpha],
+ x1 - run_x1);
+ }
+ }
+ else
+ {
+ alpha = (running_sum >> 16) & 0xff;
+ if (alpha)
+ art_rgb_run_alpha (linebuf,
+ r, g, b, alphatab[alpha],
+ x1 - x0);
+ }
+
+ data->buf += data->rowstride;
+}
+
+static void
+art_rgb_svp_alpha_opaque_callback (void *callback_data, int y,
+ int start,
+ ArtSVPRenderAAStep *steps, int n_steps)
+{
+ ArtRgbSVPAlphaData *data = (ArtRgbSVPAlphaData *)callback_data;
+ art_u8 *linebuf;
+ int run_x0, run_x1;
+ art_u32 running_sum = start;
+ int x0, x1;
+ int k;
+ art_u8 r, g, b;
+ int *alphatab;
+ int alpha;
+
+ linebuf = data->buf;
+ x0 = data->x0;
+ x1 = data->x1;
+
+ r = data->r;
+ g = data->g;
+ b = data->b;
+ alphatab = data->alphatab;
+
+ if (n_steps > 0)
+ {
+ run_x1 = steps[0].x;
+ if (run_x1 > x0)
+ {
+ alpha = running_sum >> 16;
+ if (alpha)
+ {
+ if (alpha >= 255)
+ art_rgb_fill_run (linebuf,
+ r, g, b,
+ run_x1 - x0);
+ else
+ art_rgb_run_alpha (linebuf,
+ r, g, b, alphatab[alpha],
+ run_x1 - x0);
+ }
+ }
+
+ for (k = 0; k < n_steps - 1; k++)
+ {
+ running_sum += steps[k].delta;
+ run_x0 = run_x1;
+ run_x1 = steps[k + 1].x;
+ if (run_x1 > run_x0)
+ {
+ alpha = running_sum >> 16;
+ if (alpha)
+ {
+ if (alpha >= 255)
+ art_rgb_fill_run (linebuf + (run_x0 - x0) * 3,
+ r, g, b,
+ run_x1 - run_x0);
+ else
+ art_rgb_run_alpha (linebuf + (run_x0 - x0) * 3,
+ r, g, b, alphatab[alpha],
+ run_x1 - run_x0);
+ }
+ }
+ }
+ running_sum += steps[k].delta;
+ if (x1 > run_x1)
+ {
+ alpha = running_sum >> 16;
+ if (alpha)
+ {
+ if (alpha >= 255)
+ art_rgb_fill_run (linebuf + (run_x1 - x0) * 3,
+ r, g, b,
+ x1 - run_x1);
+ else
+ art_rgb_run_alpha (linebuf + (run_x1 - x0) * 3,
+ r, g, b, alphatab[alpha],
+ x1 - run_x1);
+ }
+ }
+ }
+ else
+ {
+ alpha = running_sum >> 16;
+ if (alpha)
+ {
+ if (alpha >= 255)
+ art_rgb_fill_run (linebuf,
+ r, g, b,
+ x1 - x0);
+ else
+ art_rgb_run_alpha (linebuf,
+ r, g, b, alphatab[alpha],
+ x1 - x0);
+ }
+ }
+
+ data->buf += data->rowstride;
+}
+
+/**
+ * art_rgb_svp_alpha: Alpha-composite sorted vector path over RGB buffer.
+ * @svp: The source sorted vector path.
+ * @x0: Left coordinate of destination rectangle.
+ * @y0: Top coordinate of destination rectangle.
+ * @x1: Right coordinate of destination rectangle.
+ * @y1: Bottom coordinate of destination rectangle.
+ * @rgba: Color in 0xRRGGBBAA format.
+ * @buf: Destination RGB buffer.
+ * @rowstride: Rowstride of @buf buffer.
+ * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
+ *
+ * Renders the shape specified with @svp over the @buf RGB buffer.
+ * @x1 - @x0 specifies the width, and @y1 - @y0 specifies the height,
+ * of the rectangle rendered. The new pixels are stored starting at
+ * the first byte of @buf. Thus, the @x0 and @y0 parameters specify
+ * an offset within @svp, and may be tweaked as a way of doing
+ * integer-pixel translations without fiddling with @svp itself.
+ *
+ * The @rgba argument specifies the color for the rendering. Pixels of
+ * entirely 0 winding number are left untouched. Pixels of entirely
+ * 1 winding number have the color @rgba composited over them (ie,
+ * are replaced by the red, green, blue components of @rgba if the alpha
+ * component is 0xff). Pixels of intermediate coverage are interpolated
+ * according to the rule in @alphagamma, or default to linear if
+ * @alphagamma is NULL.
+ **/
+void
+art_rgb_svp_alpha (const ArtSVP *svp,
+ int x0, int y0, int x1, int y1,
+ art_u32 rgba,
+ art_u8 *buf, int rowstride,
+ ArtAlphaGamma *alphagamma)
+{
+ ArtRgbSVPAlphaData data;
+ int r, g, b, alpha;
+ int i;
+ int a, da;
+
+ r = rgba >> 24;
+ g = (rgba >> 16) & 0xff;
+ b = (rgba >> 8) & 0xff;
+ alpha = rgba & 0xff;
+
+ data.r = r;
+ data.g = g;
+ data.b = b;
+ data.alpha = alpha;
+
+ a = 0x8000;
+ da = (alpha * 66051 + 0x80) >> 8; /* 66051 equals 2 ^ 32 / (255 * 255) */
+
+ for (i = 0; i < 256; i++)
+ {
+ data.alphatab[i] = a >> 16;
+ a += da;
+ }
+
+ data.buf = buf;
+ data.rowstride = rowstride;
+ data.x0 = x0;
+ data.x1 = x1;
+ if (alpha == 255)
+ art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_alpha_opaque_callback,
+ &data);
+ else
+ art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_alpha_callback, &data);
+}
+
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