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/*
* art_render_pattern.c:
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "art_render_pattern.h"
#include <math.h>
typedef struct _ArtImageSourcePattern ArtImageSourcePattern;
struct _ArtImageSourcePattern {
ArtImageSource super;
const ArtPattern *pattern;
};
static void
art_render_pattern_done (ArtRenderCallback *self, ArtRender *render)
{
art_free (self);
}
static void
art_render_pattern_render (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
ArtImageSourcePattern *z = (ArtImageSourcePattern *)self;
const ArtPattern *pattern = z->pattern;
int pixstride = (render->n_chan + 1) * (render->depth >> 3);
int n_ch = render->n_chan + 1;
int x, j, index;
int width = render->x1 - render->x0;
int twidth = pattern->twidth;
int theight = pattern->theight;
art_u8 *bufp = render->image_buf;
double angle = pattern->angle;
double opacity = pattern->opacity;
double cosangle = cos(angle);
double sinangle = sin(angle);
y = y - render->y0;
if(theight == 0) return;
for (x = 0; x < width; x++)
{
int x0 = sinangle * y + cosangle * x;
int y0 = -sinangle * x + cosangle * y;
x0 = (x0 % twidth);
if(x0 < 0) x0 += twidth;
y0 = (y0 % theight);
if(y0 < 0) y0 += theight;
index = (((y0 * twidth + x0) * pixstride) % (twidth * theight * 4));
/*for (j = 0; j < n_ch - 1; j++)
{*/
/* bgra -> rgba */
bufp[0] = pattern->buffer[index + 2];
bufp[1] = pattern->buffer[index + 1];
bufp[2] = pattern->buffer[index + 0];
bufp[3] = opacity;
/*}*/
bufp += pixstride;
}
}
static void
art_render_pattern_negotiate (ArtImageSource *self, ArtRender *render,
ArtImageSourceFlags *p_flags,
int *p_buf_depth, ArtAlphaType *p_alpha)
{
self->super.render = art_render_pattern_render;
*p_flags = 0;
*p_buf_depth = render->depth;
*p_alpha = ART_ALPHA_SEPARATE;
}
void
art_render_pattern (ArtRender *render,
const ArtPattern *pattern,
ArtFilterLevel level)
{
ArtImageSourcePattern *image_source = art_new (ArtImageSourcePattern, 1);
image_source->super.super.render = NULL;
image_source->super.super.done = art_render_pattern_done;
image_source->super.negotiate = art_render_pattern_negotiate;
image_source->pattern = pattern;
art_render_add_image_source (render, &image_source->super);
}
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