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112 lines
3.1 KiB
112 lines
3.1 KiB
/*
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* art_render_pattern.c:
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*
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* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 2000 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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*/
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#include "config.h"
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#include "art_render_pattern.h"
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#include <math.h>
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typedef struct _ArtImageSourcePattern ArtImageSourcePattern;
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struct _ArtImageSourcePattern {
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ArtImageSource super;
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const ArtPattern *pattern;
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};
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static void
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art_render_pattern_done (ArtRenderCallback *self, ArtRender *render)
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{
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art_free (self);
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}
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static void
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art_render_pattern_render (ArtRenderCallback *self, ArtRender *render,
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art_u8 *dest, int y)
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{
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ArtImageSourcePattern *z = (ArtImageSourcePattern *)self;
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const ArtPattern *pattern = z->pattern;
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int pixstride = (render->n_chan + 1) * (render->depth >> 3);
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int n_ch = render->n_chan + 1;
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int x, j, index;
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int width = render->x1 - render->x0;
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int twidth = pattern->twidth;
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int theight = pattern->theight;
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art_u8 *bufp = render->image_buf;
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double angle = pattern->angle;
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double opacity = pattern->opacity;
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double cosangle = cos(angle);
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double sinangle = sin(angle);
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y = y - render->y0;
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if(theight == 0) return;
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for (x = 0; x < width; x++)
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{
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int x0 = sinangle * y + cosangle * x;
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int y0 = -sinangle * x + cosangle * y;
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x0 = (x0 % twidth);
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if(x0 < 0) x0 += twidth;
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y0 = (y0 % theight);
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if(y0 < 0) y0 += theight;
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index = (((y0 * twidth + x0) * pixstride) % (twidth * theight * 4));
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/*for (j = 0; j < n_ch - 1; j++)
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{*/
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/* bgra -> rgba */
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bufp[0] = pattern->buffer[index + 2];
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bufp[1] = pattern->buffer[index + 1];
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bufp[2] = pattern->buffer[index + 0];
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bufp[3] = opacity;
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/*}*/
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bufp += pixstride;
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}
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}
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static void
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art_render_pattern_negotiate (ArtImageSource *self, ArtRender *render,
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ArtImageSourceFlags *p_flags,
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int *p_buf_depth, ArtAlphaType *p_alpha)
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{
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self->super.render = art_render_pattern_render;
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*p_flags = 0;
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*p_buf_depth = render->depth;
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*p_alpha = ART_ALPHA_SEPARATE;
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}
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void
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art_render_pattern (ArtRender *render,
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const ArtPattern *pattern,
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ArtFilterLevel level)
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{
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ArtImageSourcePattern *image_source = art_new (ArtImageSourcePattern, 1);
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image_source->super.super.render = NULL;
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image_source->super.super.done = art_render_pattern_done;
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image_source->super.negotiate = art_render_pattern_negotiate;
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image_source->pattern = pattern;
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art_render_add_image_source (render, &image_source->super);
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}
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