aboutsummaryrefslogtreecommitdiff
path: root/src/render.c
blob: d2d747ea2fd161c6e23c52d0eebbe6b7363f283b (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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/****************************************************************************
 * Functions to render icons using the XRender extension.
 * Copyright (C) 2005 Joe Wingbermuehle
 ****************************************************************************/

#include "jwm.h"
#include "render.h"
#include "icon.h"
#include "image.h"
#include "main.h"
#include "color.h"
#include "error.h"

#ifdef USE_XRENDER
static int haveRender = 0;
#endif

/****************************************************************************
 ****************************************************************************/
void QueryRenderExtension()
{

#ifdef USE_XRENDER
	int event, error;
	Bool rc;

	rc = JXRenderQueryExtension(display, &event, &error);
	if(rc == True) {
		haveRender = 1;
		Debug("render extension enabled");
	} else {
		haveRender = 0;
		Debug("render extension disabled");
	}

	if(haveRender && rootDepth < 24) {
		Warning("color depth is %d, disabling icon alpha channel", rootDepth);
		haveRender = 0;
	}

#endif

}

/****************************************************************************
 ****************************************************************************/
int PutScaledRenderIcon(IconNode *icon, ScaledIconNode *node, Drawable d,
	int x, int y)
{

#ifdef USE_XRENDER

	Picture dest;
	Picture source;
	XRenderPictFormat *fp;
	int width, height;

	Assert(icon);

	if(!haveRender) {
		return 0;
	}

	source = node->imagePicture;
	if(source != None) {

		fp = JXRenderFindVisualFormat(display, rootVisual);
		Assert(fp);

		dest = JXRenderCreatePicture(display, d, fp, 0, NULL);

		if(node->width == 0) {
			width = icon->image->width;
		} else {
			width = node->width;
		}
		if(node->height == 0) {
			height = icon->image->height;
		} else {
			height = node->height;
		}

		JXRenderComposite(display, PictOpOver, source, None, dest,
			0, 0, 0, 0, x, y, width, height);

		JXRenderFreePicture(display, dest);

	}

	return 1;

#else

	return 0;

#endif

}

/****************************************************************************
 ****************************************************************************/
ScaledIconNode *CreateScaledRenderIcon(IconNode *icon,
	int width, int height) {

	ScaledIconNode *result = NULL;

#ifdef USE_XRENDER

	XRenderPictureAttributes picAttributes;
	XRenderPictFormat picFormat;
	XRenderPictFormat *fp;
	XColor color;
	GC maskGC;
	XImage *destImage;
	XImage *destMask;
	unsigned long alpha;
	int index;
	int x, y;
	double scalex, scaley;
	double srcx, srcy;
	int imageLine;
	int maskLine;

	Assert(icon);

	if(!haveRender) {
		return NULL;
	}

	result = Allocate(sizeof(ScaledIconNode));
	result->next = icon->nodes;
	icon->nodes = result;

	if(width == 0) {
		width = icon->image->width;
	}
	if(height == 0) {
		height = icon->image->height;
	}
	result->width = width;
	result->height = height;

	scalex = (double)icon->image->width / width;
	scaley = (double)icon->image->height / height;

	result->mask = JXCreatePixmap(display, rootWindow, width, height, 8);
	maskGC = JXCreateGC(display, result->mask, 0, NULL);
	result->image = JXCreatePixmap(display, rootWindow,
		width, height, rootDepth);

	destImage = JXCreateImage(display, rootVisual, rootDepth, ZPixmap, 0,
		NULL, width, height, 8, 0);
	destImage->data = Allocate(sizeof(unsigned long) * width * height);

	destMask = JXCreateImage(display, rootVisual, 8, ZPixmap, 0,
		NULL, width, height, 8, 0);
	destMask->data = Allocate(width * height);

	imageLine = 0;
	maskLine = 0;
	srcy = 0.0;
	for(y = 0; y < height; y++) {
		srcx = 0.0;
		for(x = 0; x < width; x++) {

			index = (int)srcy * icon->image->width + (int)srcx;
			alpha = (icon->image->data[index] >> 24) & 0xFFUL;
			color.red = ((icon->image->data[index] >> 16) & 0xFFUL) * 257;
			color.green = ((icon->image->data[index] >> 8) & 0xFFUL) * 257;
			color.blue = (icon->image->data[index] & 0xFFUL) * 257;

			GetColor(&color);
			XPutPixel(destImage, x, y, color.pixel);
			destMask->data[maskLine + x] = alpha * 257;

			srcx += scalex;

		}
		srcy += scaley;
		imageLine += destImage->bytes_per_line;
		maskLine += destMask->bytes_per_line;
	}

	/* Render the image data to the image pixmap. */
	JXPutImage(display, result->image, rootGC, destImage, 0, 0, 0, 0,
		width, height);
	Release(destImage->data);
	destImage->data = NULL;
	JXDestroyImage(destImage);

	/* Render the alpha data to the mask pixmap. */
	JXPutImage(display, result->mask, maskGC, destMask, 0, 0, 0, 0,
		width, height);
	Release(destMask->data);
	destMask->data = NULL;
	JXDestroyImage(destMask);
	JXFreeGC(display, maskGC);

	/* Create the render picture. */
	picFormat.type = PictTypeDirect;
	picFormat.depth = 8;
	picFormat.direct.alphaMask = 0xFF;
	fp = JXRenderFindFormat(display,
		PictFormatType | PictFormatDepth | PictFormatAlphaMask,
		&picFormat, 0);
	Assert(fp);
	result->maskPicture = JXRenderCreatePicture(display, result->mask,
		fp, 0, NULL);
	picAttributes.alpha_map = result->maskPicture;
	fp = JXRenderFindVisualFormat(display, rootVisual);
	Assert(fp);
	result->imagePicture = JXRenderCreatePicture(display, result->image,
		fp, CPAlphaMap, &picAttributes);

	/* Free unneeded pixmaps. */
	JXFreePixmap(display, result->image);
	result->image = None;
	JXFreePixmap(display, result->mask);
	result->mask = None;

#endif

	return result;

}