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Commit 07b69eaf authored by Grzegorz Daniluk's avatar Grzegorz Daniluk
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gfx: rotate bitmaps by angle, or by given _sin_ and _cos_ of angle

parent ed89fd5b
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sw/common/gfx/gfx.c
View file @ 07b69eaf
......@@ -2,6 +2,7 @@
* Copyright (C) 2014 Julian Lewis
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
* @author Matthieu Cattin <matthieu.cattin@cern.ch>
* &author Grzegorz Daniluk <grzegorz.daniluk@cern.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
......@@ -27,6 +28,7 @@
#include <stdlib.h>
#include "gfx.h"
#include "sincos.h"
#define GFX_POOL_SIZE 4096
......@@ -258,3 +260,49 @@ void gfx_draw_bitmap(struct surface *surf, int x0, int y0, const struct rle_bitm
}
}
static void gfx_rotate(int x0, int y0, int xr, int yr, float sina, float cosa,
int *x1, int *y1)
{
int xt, yt;
/* 1. transform to (0, 0) */
xt = x0 - xr;
yt = y0 - yr;
/* 2. rotate */
*x1 = xt*cosa - yt*sina;
*y1 = yt*cosa + xt*sina;
/* 3. transofrm back to desired position */
*x1 = *x1 + xr;
*y1 = *y1 + yr;
}
void gfx_draw_bitmap_rotate(struct surface *surf, int x0, int y0,
const struct rle_bitmap *b, int xr, int yr, int angle, float sina, float cosa)
{
int x = 0, y = 0, xt, yt;
uint8_t *d = b->data;
/*calculate sin/cos of angle only once*/
if(sina>1 || sina<-1) sina = small_sin(angle);
if(cosa>1 || cosa<-1) cosa = small_cos(angle);
while(y != b->h)
{
int pix = (*d) & 0x80 ? 1 : 0;
int rep = ((*d) & 0x7f) + 1;
d++;
while(rep--)
{
if(pix) {
gfx_rotate(x0+x, y0+y, xr, yr, sina, cosa, &xt, &yt);
gfx_set_pixel(surf, xt, yt, COLOR_BLACK);
}
x++;
if(x == b->w)
{
x=0;
y++;
}
}
}
}
sw/common/gfx/gfx.h
View file @ 07b69eaf
......@@ -2,6 +2,7 @@
* Copyright (C) 2014 Julian Lewis
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
* @author Matthieu Cattin <matthieu.cattin@cern.ch>
* &author Grzegorz Daniluk <grzegorz.daniluk@cern.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
......@@ -78,6 +79,8 @@ void gfx_reset_clip (struct surface *surf);
void gfx_fill_circle(struct surface *surf, int x0, int y0, int radius, int value);
void gfx_round_box(struct surface *surf, int x0, int y0, int x1, int y1, int radius, int value);
void gfx_draw_bitmap(struct surface *surf, int x0, int y0, const struct rle_bitmap *b);
void gfx_draw_bitmap_rotate(struct surface *surf, int x0, int y0,
const struct rle_bitmap *b, int xr, int yr, int angle, float sina, float cosa);
#endif
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