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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;
int Bpp;
if ((x >= 0) && (x < bitmap->width) &&
(y >= 0) && (y < bitmap->height))
{
bpp = bitmap->format >> 24;
if (bpp < 8)
{
p = bitmap->data + (y * bitmap->stride_bytes) + (x / 8);
return p;
}
else
{
Bpp = (bpp + 7) / 8;
p = bitmap->data + (y * bitmap->stride_bytes) + (x * Bpp);
return p;
}
}
else
{
return NULL;
}
}
/*****************************************************************************/
int
bitmap_get_pixel(struct painter_bitmap *bitmap, int x, int y)
{
char *ptr;
int rv;
ptr = bitmap_get_ptr(bitmap, x, y);
if (ptr == NULL)
{
return 0;
}
switch (bitmap->format)
{
case PT_FORMAT_c1:
rv = *((unsigned char *) ptr);
rv = (rv & (0x80 >> (x % 8))) != 0;
return rv;
case PT_FORMAT_c8:
return *((unsigned char *) ptr);
case PT_FORMAT_r3g3b2:
return *((unsigned char *) ptr);
case PT_FORMAT_a1r5g5b5:
return *((unsigned short *) ptr);
case PT_FORMAT_r5g6b5:
return *((unsigned short *) ptr);
case PT_FORMAT_a8r8g8b8:
return *((unsigned int *) ptr);
case PT_FORMAT_a8b8g8r8:
return *((unsigned int *) ptr);
}
return 0;
}
/*****************************************************************************/
int
bitmap_set_pixel(struct painter_bitmap *bitmap, int x, int y, int pixel)
{
char *ptr;
ptr = bitmap_get_ptr(bitmap, x, y);
if (ptr == NULL)
{
return 0;
}
switch (bitmap->format)
{
case PT_FORMAT_r3g3b2:
*((unsigned char *) ptr) = pixel;
break;
case PT_FORMAT_a1r5g5b5:
*((unsigned short *) ptr) = pixel;
break;
case PT_FORMAT_r5g6b5:
*((unsigned short *) ptr) = pixel;
break;
case PT_FORMAT_a8r8g8b8:
*((unsigned int *) ptr) = pixel;
break;
case PT_FORMAT_a8b8g8r8:
*((unsigned int *) ptr) = pixel;
break;
}
return 0;
}
/*****************************************************************************/
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;
}
a = 0;
r = 0;
g = 0;
b = 0;
switch (src_format)
{
case PT_FORMAT_r3g3b2:
SPLIT_r3g3b2(pixel, a, r, g, b);
break;
case PT_FORMAT_a1r5g5b5:
SPLIT_a1r5g5b5(pixel, a, r, g, b);
break;
case PT_FORMAT_r5g6b5:
SPLIT_r5g6b5(pixel, a, r, g, b);
break;
case PT_FORMAT_a8r8g8b8:
SPLIT_a8r8g8b8(pixel, a, r, g, b);
break;
case PT_FORMAT_a8b8g8r8:
SPLIT_a8b8g8r8(pixel, a, r, g, b);
break;
}
rv = 0;
switch (dst_format)
{
case PT_FORMAT_a1r5g5b5:
MAKE_a1r5g5b5(rv, a, r, g, b);
break;
case PT_FORMAT_r5g6b5:
MAKE_r5g6b5(rv, a, r, g, b);
break;
case PT_FORMAT_a8r8g8b8:
MAKE_a8r8g8b8(rv, a, r, g, b);
break;
case PT_FORMAT_a8b8g8r8:
MAKE_a8b8g8r8(rv, a, r, g, b);
break;
}
return rv;
}
/*****************************************************************************/
int
painter_get_pixel(struct painter *painter, struct painter_bitmap *bitmap,
int x, int y)
{
int rv;
rv = 0;
if ((x >= 0) && (x < bitmap->width) && (y >= 0) && (y < bitmap->height))
{
switch (bitmap->format)
{
case PT_FORMAT_c1:
rv = bitmap_get_pixel(bitmap, x, y);
rv = rv ? painter->fgcolor : painter->bgcolor;
break;
case PT_FORMAT_c8:
rv = bitmap_get_pixel(bitmap, x, y);
rv = painter->palette[rv & 0xff];
break;
default:
rv = bitmap_get_pixel(bitmap, x, y);
break;
}
}
return rv;
}
/*****************************************************************************/
int
painter_set_pixel(struct painter *painter, struct painter_bitmap *bitmap,
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 < bitmap->width) &&
(y >= 0) && (y < bitmap->height))
{
pixel = pixel_convert(pixel, pixel_format, bitmap->format,
painter->palette);
if (painter->rop != PT_ROP_S)
{
pixel = do_rop(painter->rop, pixel,
bitmap_get_pixel(bitmap, x, y));
}
bitmap_set_pixel(bitmap, x, y, pixel);
}
}
return 0;
}
/*****************************************************************************/
/* return true is the is something to draw */
int
painter_warp_coords(struct painter *painter,
int *x, int *y, int *cx, int *cy,
int *srcx, int *srcy)
{
int dx;
int dy;
int lx;
int ly;
int lcx;
int lcy;
lx = *x;
ly = *y;
lcx = *cx;
lcy = *cy;
dx = 0;
dy = 0;
if (painter->clip_valid)
{
if (painter->clip.x1 > lx)
{
dx = painter->clip.x1 - lx;
}
if (painter->clip.y1 > ly)
{
dy = painter->clip.y1 - ly;
}
if (lx + lcx > painter->clip.x2)
{
lcx = (lcx - ((lx + lcx) - painter->clip.x2));
}
if (*y + lcy > painter->clip.y2)
{
lcy = (lcy - ((ly + lcy) - painter->clip.y2));
}
}
lcx = lcx - dx;
lcy = lcy - dy;
if (lcx <= 0)
{
return 0;
}
if (lcy <= 0)
{
return 0;
}
lx = lx + dx;
ly = ly + dy;
if (srcx != 0)
{
*srcx = *srcx + dx;
}
if (srcy != 0)
{
*srcy = *srcy + dy;
}
*x = lx;
*y = ly;
*cx = lcx;
*cy = lcy;
return 1;
}
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