1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* This file is subject to the terms of the GFX License, v1.0. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://chibios-gfx.com/license.html
*/
/**
* @file src/gdisp/image_native.c
* @brief GDISP native image code.
*/
#include "gfx.h"
#if GFX_USE_GDISP && GDISP_NEED_IMAGE && GDISP_NEED_IMAGE_NATIVE
/**
* How big a pixel array to allocate for blitting
* Bigger is faster but uses more RAM.
*/
#define BLIT_BUFFER_SIZE 32
#define HEADER_SIZE 8
#define FRAME0POS (HEADER_SIZE)
/**
* Helper Routines Needed
*/
void *gdispImageAlloc(gdispImage *img, size_t sz);
void gdispImageFree(gdispImage *img, void *ptr, size_t sz);
typedef struct gdispImagePrivate {
pixel_t *frame0cache;
pixel_t buf[BLIT_BUFFER_SIZE];
} gdispImagePrivate;
gdispImageError gdispImageOpen_NATIVE(gdispImage *img) {
uint8_t hdr[HEADER_SIZE];
/* Read the 8 byte header */
if (img->io.fns->read(&img->io, hdr, 8) != 8)
return GDISP_IMAGE_ERR_BADFORMAT; // It can't be us
if (hdr[0] != 'N' || hdr[1] != 'I')
return GDISP_IMAGE_ERR_BADFORMAT; // It can't be us
if (hdr[6] != GDISP_PIXELFORMAT/256 || hdr[7] != (GDISP_PIXELFORMAT & 0xFF))
return GDISP_IMAGE_ERR_UNSUPPORTED; // Unsupported pixel format
/* We know we are a native format image */
img->flags = 0;
img->width = (((uint16_t)hdr[2])<<8) | (hdr[3]);
img->height = (((uint16_t)hdr[4])<<8) | (hdr[5]);
if (img->width < 1 || img->height < 1)
return GDISP_IMAGE_ERR_BADDATA;
if (!(img->priv = (gdispImagePrivate *)gdispImageAlloc(img, sizeof(gdispImagePrivate))))
return GDISP_IMAGE_ERR_NOMEMORY;
img->priv->frame0cache = 0;
return GDISP_IMAGE_ERR_OK;
}
void gdispImageClose_NATIVE(gdispImage *img) {
if (img->priv) {
if (img->priv->frame0cache)
gdispImageFree(img, (void *)img->priv->frame0cache, img->width * img->height * sizeof(pixel_t));
gdispImageFree(img, (void *)img->priv, sizeof(gdispImagePrivate));
img->priv = 0;
}
img->io.fns->close(&img->io);
}
gdispImageError gdispImageCache_NATIVE(gdispImage *img) {
size_t len;
/* If we are already cached - just return OK */
if (img->priv->frame0cache)
return GDISP_IMAGE_ERR_OK;
/* We need to allocate the cache */
len = img->width * img->height * sizeof(pixel_t);
img->priv->frame0cache = (pixel_t *)gdispImageAlloc(img, len);
if (!img->priv->frame0cache)
return GDISP_IMAGE_ERR_NOMEMORY;
/* Read the entire bitmap into cache */
img->io.fns->seek(&img->io, FRAME0POS);
if (img->io.fns->read(&img->io, img->priv->frame0cache, len) != len)
return GDISP_IMAGE_ERR_BADDATA;
return GDISP_IMAGE_ERR_OK;
}
gdispImageError gdispImageDraw_NATIVE(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy) {
coord_t mx, mcx;
size_t pos, len;
/* Check some reasonableness */
if (sx >= img->width || sy >= img->height) return GDISP_IMAGE_ERR_OK;
if (sx + cx > img->width) cx = img->width - sx;
if (sy + cy > img->height) cy = img->height - sy;
/* Draw from the image cache - if it exists */
if (img->priv->frame0cache) {
gdispBlitAreaEx(x, y, cx, cy, sx, sy, img->width, img->priv->frame0cache);
return GDISP_IMAGE_ERR_OK;
}
/* For this image decoder we cheat and just seek straight to the region we want to display */
pos = FRAME0POS + (img->width * sy + cx) * sizeof(pixel_t);
/* Cycle through the lines */
for(;cy;cy--, y++) {
/* Move to the start of the line */
img->io.fns->seek(&img->io, pos);
/* Draw the line in chunks using BitBlt */
for(mx = x, mcx = cx; mcx > 0; mcx -= len, mx += len) {
// Read the data
len = img->io.fns->read(&img->io,
img->priv->buf,
mx > BLIT_BUFFER_SIZE ? (BLIT_BUFFER_SIZE*sizeof(pixel_t)) : (mx * sizeof(pixel_t)))
/ sizeof(pixel_t);
if (!len)
return GDISP_IMAGE_ERR_BADDATA;
/* Blit the chunk of data */
gdispBlitAreaEx(mx, y, len, 1, 0, 0, len, img->priv->buf);
}
/* Get the position for the start of the next line */
pos += img->width*sizeof(pixel_t);
}
return GDISP_IMAGE_ERR_OK;
}
delaytime_t gdispImageNext_NATIVE(gdispImage *img) {
(void) img;
/* No more frames/pages */
return TIME_INFINITE;
}
#endif /* GFX_USE_GDISP && GDISP_NEED_IMAGE && GDISP_NEED_IMAGE_NATIVE */
/** @} */
|
