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459 lines
11 KiB
459 lines
11 KiB
/* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 1998 Raph Levien
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/* Render a sorted vector path into an RGB buffer. */
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#include "config.h"
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#include "art_rgb_svp.h"
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#include <libart_lgpl/art_svp.h>
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#include <libart_lgpl/art_svp_render_aa.h>
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#include "art_rgb.h"
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typedef struct _ArtRgbSVPData ArtRgbSVPData;
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typedef struct _ArtRgbSVPAlphaData ArtRgbSVPAlphaData;
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struct _ArtRgbSVPData {
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art_u32 rgbtab[256];
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art_u8 *buf;
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int rowstride;
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int x0, x1;
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};
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struct _ArtRgbSVPAlphaData {
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int alphatab[256];
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art_u8 r, g, b, alpha;
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art_u32 rgb;
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art_u8 *buf;
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int rowstride;
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int x0, x1;
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};
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static void
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art_rgb_svp_callback_ (void *callback_data, int y,
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int start, ArtSVPRenderAAStep *steps, int n_steps)
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{
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ArtRgbSVPData *data = (ArtRgbSVPData *)callback_data;
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art_u8 *linebuf;
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int run_x0, run_x1;
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art_u32 running_sum = start;
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art_u32 rgb;
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int x0, x1;
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int k;
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linebuf = data->buf;
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x0 = data->x0;
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x1 = data->x1;
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if (n_steps > 0)
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{
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run_x1 = steps[0].x;
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if (run_x1 > x0)
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{
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rgb = data->rgbtab[(running_sum >> 16) & 0xff];
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/* art_rgb_fill_run (linebuf,
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rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
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run_x1 - x0);*/
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}
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for (k = 0; k < n_steps - 1; k++)
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{
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running_sum += steps[k].delta;
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run_x0 = run_x1;
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run_x1 = steps[k + 1].x;
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if (run_x1 > run_x0)
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{
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rgb = data->rgbtab[(running_sum >> 16) & 0xff];
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/* art_rgb_fill_run (linebuf + (run_x0 - x0) * 3,
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rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
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run_x1 - run_x0);*/
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}
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}
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running_sum += steps[k].delta;
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if (x1 > run_x1)
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{
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rgb = data->rgbtab[(running_sum >> 16) & 0xff];
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/* art_rgb_fill_run (linebuf + (run_x1 - x0) * 3,
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rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
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x1 - run_x1);*/
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}
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}
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else
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{
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rgb = data->rgbtab[(running_sum >> 16) & 0xff];
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/* art_rgb_fill_run (linebuf,
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rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
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x1 - x0);*/
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}
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data->buf += data->rowstride;
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}
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/* Render the vector path into the RGB buffer. */
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/**
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* art_rgb_svp_aa: Render sorted vector path into RGB buffer.
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* @svp: The source sorted vector path.
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* @x0: Left coordinate of destination rectangle.
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* @y0: Top coordinate of destination rectangle.
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* @x1: Right coordinate of destination rectangle.
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* @y1: Bottom coordinate of destination rectangle.
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* @fg_color: Foreground color in 0xRRGGBB format.
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* @bg_color: Background color in 0xRRGGBB format.
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* @buf: Destination RGB buffer.
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* @rowstride: Rowstride of @buf buffer.
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* @alphagamma: #ArtAlphaGamma for gamma-correcting the rendering.
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*
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* Renders the shape specified with @svp into the @buf RGB buffer.
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* @x1 - @x0 specifies the width, and @y1 - @y0 specifies the height,
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* of the rectangle rendered. The new pixels are stored starting at
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* the first byte of @buf. Thus, the @x0 and @y0 parameters specify
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* an offset within @svp, and may be tweaked as a way of doing
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* integer-pixel translations without fiddling with @svp itself.
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*
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* The @fg_color and @bg_color arguments specify the opaque colors to
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* be used for rendering. For pixels of entirely 0 winding-number,
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* @bg_color is used. For pixels of entirely 1 winding number,
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* @fg_color is used. In between, the color is interpolated based on
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* the fraction of the pixel with a winding number of 1. If
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* @alphagamma is NULL, then linear interpolation (in pixel counts) is
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* the default. Otherwise, the interpolation is as specified by
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* @alphagamma.
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**/
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void
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art_rgb_svp_aa_ (const ArtSVP *svp,
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int x0, int y0, int x1, int y1,
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art_u32 fg_color, art_u32 bg_color,
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art_u8 *buf, int rowstride,
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ArtAlphaGamma *alphagamma)
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{
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ArtRgbSVPData data;
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int r_fg, g_fg, b_fg;
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int r_bg, g_bg, b_bg;
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int r, g, b;
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int dr, dg, db;
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int i;
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if (alphagamma == NULL)
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{
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r_fg = fg_color >> 16;
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g_fg = (fg_color >> 8) & 0xff;
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b_fg = fg_color & 0xff;
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r_bg = bg_color >> 16;
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g_bg = (bg_color >> 8) & 0xff;
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b_bg = bg_color & 0xff;
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r = (r_bg << 16) + 0x8000;
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g = (g_bg << 16) + 0x8000;
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b = (b_bg << 16) + 0x8000;
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dr = ((r_fg - r_bg) << 16) / 255;
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dg = ((g_fg - g_bg) << 16) / 255;
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db = ((b_fg - b_bg) << 16) / 255;
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for (i = 0; i < 256; i++)
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{
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data.rgbtab[i] = (r & 0xff0000) | ((g & 0xff0000) >> 8) | (b >> 16);
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r += dr;
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g += dg;
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b += db;
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}
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}
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else
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{
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int *table;
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art_u8 *invtab;
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table = alphagamma->table;
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r_fg = table[fg_color >> 16];
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g_fg = table[(fg_color >> 8) & 0xff];
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b_fg = table[fg_color & 0xff];
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r_bg = table[bg_color >> 16];
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g_bg = table[(bg_color >> 8) & 0xff];
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b_bg = table[bg_color & 0xff];
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r = (r_bg << 16) + 0x8000;
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g = (g_bg << 16) + 0x8000;
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b = (b_bg << 16) + 0x8000;
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dr = ((r_fg - r_bg) << 16) / 255;
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dg = ((g_fg - g_bg) << 16) / 255;
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db = ((b_fg - b_bg) << 16) / 255;
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invtab = alphagamma->invtable;
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for (i = 0; i < 256; i++)
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{
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data.rgbtab[i] = (invtab[r >> 16] << 16) |
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(invtab[g >> 16] << 8) |
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invtab[b >> 16];
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r += dr;
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g += dg;
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b += db;
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}
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}
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data.buf = buf;
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data.rowstride = rowstride;
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data.x0 = x0;
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data.x1 = x1;
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art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_callback_, &data);
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}
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static void
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art_rgb_svp_alpha_callback_ (void *callback_data, int y,
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int start, ArtSVPRenderAAStep *steps, int n_steps)
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{
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ArtRgbSVPAlphaData *data = (ArtRgbSVPAlphaData *)callback_data;
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art_u8 *linebuf;
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int run_x0, run_x1;
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art_u32 running_sum = start;
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int x0, x1;
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int k;
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art_u8 r, g, b;
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int *alphatab;
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int alpha;
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linebuf = data->buf;
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x0 = data->x0;
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x1 = data->x1;
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r = data->r;
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g = data->g;
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b = data->b;
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alphatab = data->alphatab;
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if (n_steps > 0)
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{
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run_x1 = steps[0].x;
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if (run_x1 > x0)
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{
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alpha = (running_sum >> 16) & 0xff;
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if (alpha)
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art_rgb_run_alpha_ (linebuf,
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r, g, b, alphatab[alpha],
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run_x1 - x0);
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}
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for (k = 0; k < n_steps - 1; k++)
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{
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running_sum += steps[k].delta;
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run_x0 = run_x1;
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run_x1 = steps[k + 1].x;
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if (run_x1 > run_x0)
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{
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alpha = (running_sum >> 16) & 0xff;
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if (alpha)
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art_rgb_run_alpha_ (linebuf + (run_x0 - x0) * 4,
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r, g, b, alphatab[alpha],
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run_x1 - run_x0);
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}
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}
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running_sum += steps[k].delta;
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if (x1 > run_x1)
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{
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alpha = (running_sum >> 16) & 0xff;
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if (alpha)
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art_rgb_run_alpha_ (linebuf + (run_x1 - x0) * 4,
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r, g, b, alphatab[alpha],
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x1 - run_x1);
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}
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}
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else
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{
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alpha = (running_sum >> 16) & 0xff;
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if (alpha)
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art_rgb_run_alpha_ (linebuf,
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r, g, b, alphatab[alpha],
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x1 - x0);
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}
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data->buf += data->rowstride;
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}
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static void
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art_rgb_svp_alpha_opaque_callback_ (void *callback_data, int y,
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int start,
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ArtSVPRenderAAStep *steps, int n_steps)
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{
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ArtRgbSVPAlphaData *data = (ArtRgbSVPAlphaData *)callback_data;
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art_u8 *linebuf;
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int run_x0, run_x1;
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art_u32 running_sum = start;
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int x0, x1;
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int k;
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art_u8 r, g, b;
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art_u32 rgb;
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int *alphatab;
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int alpha;
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linebuf = data->buf;
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x0 = data->x0;
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x1 = data->x1;
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r = data->r;
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g = data->g;
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b = data->b;
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rgb = data->rgb;
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alphatab = data->alphatab;
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if (n_steps > 0)
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{
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run_x1 = steps[0].x;
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if (run_x1 > x0)
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{
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alpha = running_sum >> 16;
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if (alpha)
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{
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if (alpha >= 255)
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art_rgb_fill_run_ (linebuf,
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rgb,
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run_x1 - x0);
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else
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art_rgb_run_alpha_ (linebuf,
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r, g, b, alphatab[alpha],
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run_x1 - x0);
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}
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}
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for (k = 0; k < n_steps - 1; k++)
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{
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running_sum += steps[k].delta;
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run_x0 = run_x1;
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run_x1 = steps[k + 1].x;
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if (run_x1 > run_x0)
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{
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alpha = running_sum >> 16;
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if (alpha)
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{
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if (alpha >= 255)
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art_rgb_fill_run_ (linebuf + (run_x0 - x0) * 4,
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rgb,
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run_x1 - run_x0);
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else
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art_rgb_run_alpha_ (linebuf + (run_x0 - x0) * 4,
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r, g, b, alphatab[alpha],
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run_x1 - run_x0);
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}
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}
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}
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running_sum += steps[k].delta;
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if (x1 > run_x1)
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{
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alpha = running_sum >> 16;
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if (alpha)
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{
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if (alpha >= 255)
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art_rgb_fill_run_ (linebuf + (run_x1 - x0) * 4,
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rgb,
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x1 - run_x1);
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else
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art_rgb_run_alpha_ (linebuf + (run_x1 - x0) * 4,
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r, g, b, alphatab[alpha],
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x1 - run_x1);
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}
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}
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}
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else
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{
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alpha = running_sum >> 16;
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if (alpha)
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{
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if (alpha >= 255)
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art_rgb_fill_run_ (linebuf,
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rgb,
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x1 - x0);
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else
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art_rgb_run_alpha_ (linebuf,
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r, g, b, alphatab[alpha],
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x1 - x0);
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}
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}
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data->buf += data->rowstride;
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}
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/**
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* art_rgb_svp_alpha: Alpha-composite sorted vector path over RGB buffer.
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* @svp: The source sorted vector path.
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* @x0: Left coordinate of destination rectangle.
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* @y0: Top coordinate of destination rectangle.
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* @x1: Right coordinate of destination rectangle.
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* @y1: Bottom coordinate of destination rectangle.
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* @rgba: Color in 0xRRGGBBAA format.
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* @buf: Destination RGB buffer.
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* @rowstride: Rowstride of @buf buffer.
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* @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
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*
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* Renders the shape specified with @svp over the @buf RGB buffer.
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* @x1 - @x0 specifies the width, and @y1 - @y0 specifies the height,
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* of the rectangle rendered. The new pixels are stored starting at
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* the first byte of @buf. Thus, the @x0 and @y0 parameters specify
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* an offset within @svp, and may be tweaked as a way of doing
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* integer-pixel translations without fiddling with @svp itself.
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*
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* The @rgba argument specifies the color for the rendering. Pixels of
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* entirely 0 winding number are left untouched. Pixels of entirely
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* 1 winding number have the color @rgba composited over them (ie,
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* are replaced by the red, green, blue components of @rgba if the alpha
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* component is 0xff). Pixels of intermediate coverage are interpolated
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* according to the rule in @alphagamma, or default to linear if
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* @alphagamma is NULL.
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**/
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void
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art_rgb_svp_alpha_ (const ArtSVP *svp,
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int x0, int y0, int x1, int y1,
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art_u32 rgb, int alpha,
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art_u8 *buf, int rowstride,
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ArtAlphaGamma *alphagamma)
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{
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ArtRgbSVPAlphaData data;
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int r, g, b;
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int i;
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int a, da;
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r = (rgb >> 16) & 0xff;
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g = (rgb >> 8) & 0xff;
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b = rgb & 0xff;
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data.r = r;
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data.g = g;
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data.b = b;
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data.alpha = alpha;
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data.rgb = rgb;
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a = 0x8000;
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da = (alpha * 66051 + 0x80) >> 8; /* 66051 equals 2 ^ 32 / (255 * 255) */
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for (i = 0; i < 256; i++)
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{
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data.alphatab[i] = a >> 16;
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a += da;
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}
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data.buf = buf;
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data.rowstride = rowstride;
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data.x0 = x0;
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data.x1 = x1;
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if (alpha == 255)
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art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_alpha_opaque_callback_,
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&data);
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else
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art_svp_render_aa (svp, x0, y0, x1, y1, art_rgb_svp_alpha_callback_, &data);
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}
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