Wed, 02 Jan 2002 10:17:24 +0000
improve floating point literal handling.
1 #include <stdlib.h>
3 #include "type.h"
4 #include "bitblt.h"
6 static inline u8 pixel_mask (x)
7 {
8 #ifdef LSB_LEFT
9 return (1 << x);
10 #else
11 return (1 << (7 - x));
12 #endif
13 }
15 static inline u32 rect_width (Rect r)
16 {
17 return (r.lower_right.x - r.upper_left.x);
18 }
20 static inline u32 rect_height (Rect r)
21 {
22 return (r.lower_right.y - r.upper_left.y);
23 }
25 Bitmap *create_bitmap (u32 width, u32 height)
26 {
27 Bitmap *bitmap;
29 bitmap = calloc (1, sizeof (Bitmap));
30 if (! bitmap)
31 return (NULL);
32 bitmap->width = width;
33 bitmap->height = height;
34 bitmap->rowbytes = (width - 1) / 8 + 1;
35 bitmap->bits = calloc (height * bitmap->rowbytes, 1);
36 if (! bitmap->bits)
37 {
38 free (bitmap);
39 return (NULL);
40 }
41 return (bitmap);
42 }
44 void free_bitmap (Bitmap *bitmap)
45 {
46 free (bitmap->bits);
47 free (bitmap);
48 }
50 boolean get_pixel (Bitmap *bitmap, Point coord)
51 {
52 u8 *p;
53 if ((coord.x < 0) || (coord.y < 0) ||
54 (coord.x >= bitmap->width) || (coord.y >= bitmap->height))
55 return (0);
56 p = bitmap->bits + coord.y * bitmap->rowbytes + coord.x / 8;
57 return ((*p & pixel_mask (coord.x & 7)) != 0);
58 }
60 void set_pixel (Bitmap *bitmap, Point coord, boolean value)
61 {
62 u8 *p;
63 if ((coord.x < 0) || (coord.y < 0) ||
64 (coord.x >= bitmap->width) || (coord.y >= bitmap->height))
65 return;
66 p = bitmap->bits + coord.y * bitmap->rowbytes + coord.x / 8;
67 if (value)
68 *p |= pixel_mask (coord.x & 7);
69 else
70 *p &= (0xff ^ pixel_mask (coord.x & 7));
71 }
74 Bitmap *bitblt (Bitmap *src_bitmap,
75 Rect src_rect,
76 Bitmap *dest_bitmap,
77 Point dest_upper_left,
78 int scan,
79 int tfn)
80 {
81 Point src_point, dest_point;
83 if (! dest_bitmap)
84 {
85 if (scan & TRANSPOSE)
86 dest_bitmap = create_bitmap (dest_upper_left.x + rect_height (src_rect),
87 dest_upper_left.y + rect_width (src_rect));
88 else
89 dest_bitmap = create_bitmap (dest_upper_left.x + rect_width (src_rect),
90 dest_upper_left.y + rect_height (src_rect));
91 if (! dest_bitmap)
92 return (NULL);
93 }
95 for (src_point.y = src_rect.upper_left.y;
96 src_point.y < src_rect.lower_right.y;
97 src_point.y++)
98 {
99 for (src_point.x = src_rect.upper_left.x;
100 src_point.x < src_rect.lower_right.x;
101 src_point.x++)
102 {
103 boolean a, b, c;
105 if (scan & TRANSPOSE)
106 {
107 dest_point.x = src_point.y - src_rect.upper_left.y;
108 dest_point.y = src_point.x - src_rect.upper_left.x;
110 if (scan & FLIP_H)
111 dest_point.x = (rect_height (src_rect) - 1) - dest_point.x;
113 if (scan & FLIP_V)
114 dest_point.y = (rect_width (src_rect) - 1) - dest_point.y;
115 }
116 else
117 {
118 dest_point.x = src_point.x - src_rect.upper_left.x;
119 dest_point.y = src_point.y - src_rect.upper_left.y;
121 if (scan & FLIP_H)
122 dest_point.x = (rect_width (src_rect) - 1) - dest_point.x;
124 if (scan & FLIP_V)
125 dest_point.y = (rect_height (src_rect) - 1) - dest_point.y;
126 }
128 dest_point.x += dest_upper_left.x;
129 dest_point.y += dest_upper_left.y;
131 a = get_pixel (src_bitmap, src_point);
132 b = get_pixel (dest_bitmap, dest_point);
133 c = (tfn & (1 << (a * 2 + b))) != 0;
135 set_pixel (dest_bitmap, dest_point, c);
136 }
137 }
138 return (dest_bitmap);
139 }