+++ /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 "art_misc.h"
-
-#include "art_svp.h"
-#include "art_svp_render_aa.h"
-#include "art_rgb.h"
-#include "art_rgb_svp.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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