aboutsummaryrefslogtreecommitdiffstats
path: root/src/gwin/gwin_image.c
blob: 370d7bdda0717b3bcc8600528d79624d03e65f44 (plain)
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.org/license.html
 */

/**
 * @file	src/gwin/gwin_image.c
 * @brief	GWIN sub-system image code
 */

#include "gfx.h"

#if GFX_USE_GWIN && GWIN_NEED_IMAGE

#include "gwin_class.h"

#define widget(gh)	((GImageObject *)gh)

static void _destroy(GWindowObject *gh) {
	if (gdispImageIsOpen(&widget(gh)->image))
		gdispImageClose(&widget(gh)->image);
}

#if GWIN_NEED_IMAGE_ANIMATION
	static void _timer(void *param) {
		_gwinUpdate((GHandle)param);
	}
#endif

static void _redraw(GHandle gh) {
	coord_t		x, y, w, h, dx, dy;
	color_t		bg;
	#if GWIN_NEED_IMAGE_ANIMATION
		delaytime_t	delay;
	#endif

	// The default display area
	dx = 0;
	dy = 0;
	x = gh->x;
	y = gh->y;
	w = gh->width;
	h = gh->height;
	bg = gwinGetDefaultBgColor();

	// If the image isn't open just clear the area
	if (!gdispImageIsOpen(&widget(gh)->image)) {
		gdispGFillArea(gh->display, x, y, w, h, bg);
		return;
	}

	// Center horizontally if the area is larger than the image
	if (widget(gh)->image.width < w) {
		w = widget(gh)->image.width;
		dx = (gh->width-w)/2;
		x += dx;
		if (dx)
			gdispGFillArea(gh->display, gh->x, y, dx, h, bg);
		gdispGFillArea(gh->display, x+w, y, gh->width-dx-w, h, bg);
		dx = 0;
	}

	// Center image horizontally if the area is smaller than the image
	else if (widget(gh)->image.width > w) {
		dx = (widget(gh)->image.width - w)/2;
	}

	// Center vertically if the area is larger than the image
	if (widget(gh)->image.height < h) {
		h = widget(gh)->image.height;
		dy = (gh->height-h)/2;
		y += dy;
		if (dy)
			gdispGFillArea(gh->display, x, gh->y, w, dy, bg);
		gdispGFillArea(gh->display, x, y+h, w, gh->height-dy-h, bg);
		dy = 0;
	}

	// Center image vertically if the area is smaller than the image
	else if (widget(gh)->image.height > h) {
		dy = (widget(gh)->image.height - h)/2;
	}

	// Reset the background color in case it has changed
	gdispImageSetBgColor(&widget(gh)->image, bg);

	// Display the image
	gdispGImageDraw(gh->display, &widget(gh)->image, x, y, w, h, dx, dy);

	#if GWIN_NEED_IMAGE_ANIMATION
		// read the delay for the next frame
		delay = gdispImageNext(&widget((GHandle)gh)->image);

		// Wait for that delay if required
		switch(delay) {
		case TIME_INFINITE:
			// Everything is done
			break;
		case TIME_IMMEDIATE:
			// We can't allow a continuous loop here as it would lock the system up so we delay for the minimum period
			delay = 1;
			// Fall through
		default:
			// Start the timer to draw the next frame of the animation
			gtimerStart(&widget((GHandle)gh)->timer, _timer, (void*)gh, FALSE, delay);
			break;
		}
	#endif
}

static const gwinVMT imageVMT = {
	"Image",					// The class name
	sizeof(GImageObject),		// The object size
	_destroy,					// The destroy routine
	_redraw,					// The redraw routine
	0,							// The after-clear routine
};

GHandle gwinGImageCreate(GDisplay *g, GImageObject *gobj, GWindowInit *pInit) {
	if (!(gobj = (GImageObject *)_gwindowCreate(g, &gobj->g, pInit, &imageVMT, 0)))
		return 0;

	// Ensure the gdispImageIsOpen() gives valid results
	gdispImageInit(&gobj->image);

	// Initialise the timer
	#if GWIN_NEED_IMAGE_ANIMATION
		gtimerInit(&gobj->timer);
	#endif
	
	gwinSetVisible((GHandle)gobj, pInit->show);

	return (GHandle)gobj;
}

bool_t gwinImageOpenGFile(GHandle gh, GFILE *f) {
	// is it a valid handle?
	if (gh->vmt != (gwinVMT *)&imageVMT)
		return FALSE;

	if (gdispImageIsOpen(&widget(gh)->image))
		gdispImageClose(&widget(gh)->image);

	if ((gdispImageOpenGFile(&widget(gh)->image, f) & GDISP_IMAGE_ERR_UNRECOVERABLE))
		return FALSE;

	_gwinUpdate(gh);

	return TRUE;
}

gdispImageError gwinImageCache(GHandle gh) {
	// is it a valid handle?
	if (gh->vmt != (gwinVMT *)&imageVMT)
		return GDISP_IMAGE_ERR_BADFORMAT;

	return gdispImageCache(&widget(gh)->image);
}

#endif // GFX_USE_GWIN && GWIN_NEED_IMAGE