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/**
* painter utils
*
* Copyright 2015 Jay Sorg <jay.sorg@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "painter.h"
#include "painter_utils.h"
/*****************************************************************************/
/* do a raster op */
int
do_rop(int rop, int src, int dst)
{
switch (rop)
{
case PT_ROP_0: return 0;
case PT_ROP_DSon: return ~(src | dst);
case PT_ROP_DSna: return (~src) & dst;
case PT_ROP_Sn: return ~src;
case PT_ROP_SDna: return src & (~dst);
case PT_ROP_Dn: return ~(dst);
case PT_ROP_DSx: return src ^ dst;
case PT_ROP_DSan: return ~(src & dst);
case PT_ROP_DSa: return src & dst;
case PT_ROP_DSxn: return ~(src) ^ dst;
case PT_ROP_D: return dst;
case PT_ROP_DSno: return (~src) | dst;
case PT_ROP_S: return src;
case PT_ROP_SDno: return src | (~dst);
case PT_ROP_DSo: return src | dst;
case PT_ROP_1: return ~0;
}
return dst;
}
/*****************************************************************************/
char *
bitmap_get_ptr(struct painter_bitmap *bitmap, int x, int y)
{
char *p;
int Bpp;
if ((x >= 0) && (x < bitmap->width) &&
(y >= 0) && (y < bitmap->height))
{
Bpp = ((bitmap->format >> 24) + 7) / 8;
p = bitmap->data + (y * bitmap->stride_bytes) + (x * Bpp);
return p;
}
else
{
return NULL;
}
}
/*****************************************************************************/
int
pixel_convert(int pixel, int src_format, int dst_format, int *palette)
{
int a;
int r;
int g;
int b;
int rv;
if (src_format == dst_format)
{
return pixel;
}
switch (src_format)
{
case PT_FORMAT_a1r5g5b5:
SPLIT_a1r5g5b5(pixel, a, r, g, b);
break;
case PT_FORMAT_r5g6b5:
SPLIT_r5g6b5(pixel, a, r, g, b);
break;
}
rv = 0;
switch (dst_format)
{
case PT_FORMAT_a8r8g8b8:
rv = (a << 24) | (r << 16) | (g << 8) | b;
break;
}
return rv;
}
/*****************************************************************************/
int
painter_set_pixel(struct painter *painter, struct painter_bitmap *dst,
int x, int y, int pixel, int pixel_format)
{
if (painter->clip_valid == 0 ||
(x >= painter->clip.x1 && x < painter->clip.x2 &&
y >= painter->clip.y1 && y < painter->clip.y2))
{
if ((x >= 0) && (x < dst->width) &&
(y >= 0) && (y < dst->height))
{
pixel = pixel_convert(pixel, pixel_format, dst->format,
painter->palete);
if (rop != PT_ROP_S)
{
pixel = do_rop(painter->rop, pixel,
bitmap_get_pixel(dst, x, y));
}
bitmap_set_pixel(dst, x, y, pixel);
}
}
}
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