summaryrefslogtreecommitdiff
path: root/gtk/gtk_plotters.c
blob: 700493b4cb1f5be1e17acfb14c713f881ac9d531 (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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
/*
 * Copyright 2006 Rob Kendrick <rjek@rjek.com>
 * Copyright 2005 James Bursa <bursa@users.sourceforge.net>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/** \file
 * Target independent plotting (GDK / GTK+ and Cairo implementation).
 * Can use either GDK drawing primitives (which are mostly passed straight
 * to X to process, and thus accelerated) or Cairo drawing primitives (much
 * higher quality, not accelerated).  Cairo's fast enough, so it defaults
 * to using it if it is available.  It does this by checking for the
 * CAIRO_VERSION define that the cairo headers set.
 */

#include <math.h>
#include <assert.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "desktop/plotters.h"
#include "gtk/font_pango.h"
#include "gtk/gtk_plotters.h"
#include "gtk/gtk_scaffolding.h"
#include "render/font.h"
#include "utils/log.h"
#include "desktop/options.h"
#include "gtk/options.h"
#include "gtk/gtk_bitmap.h"

#ifndef CAIRO_VERSION
#error "nsgtk requires cairo"
#endif

GtkWidget *current_widget;
GdkDrawable *current_drawable;
GdkGC *current_gc;
cairo_t *current_cr;

static bool nsgtk_plot_clg(colour c);
static bool nsgtk_plot_rectangle(int x0, int y0, int width, int height,
		int line_width, colour c, bool dotted, bool dashed);
static bool nsgtk_plot_line(int x0, int y0, int x1, int y1, int width,
		colour c, bool dotted, bool dashed);
static bool nsgtk_plot_polygon(const int *p, unsigned int n, colour fill);
static bool nsgtk_plot_path(const float *p, unsigned int n, colour fill, float width,
                    colour c, const float transform[6]);
static bool nsgtk_plot_fill(int x0, int y0, int x1, int y1, colour c);
static bool nsgtk_plot_clip(int clip_x0, int clip_y0,
		int clip_x1, int clip_y1);
static bool nsgtk_plot_text(int x, int y, const struct css_style *style,
		const char *text, size_t length, colour bg, colour c);
static bool nsgtk_plot_disc(int x, int y, int radius, colour c, bool filled);
static bool nsgtk_plot_arc(int x, int y, int radius, int angle1, int angle2,
    		colour c);
static bool nsgtk_plot_bitmap(int x, int y, int width, int height,
		struct bitmap *bitmap, colour bg, struct content *content);
static bool nsgtk_plot_bitmap_tile(int x, int y, int width, int height,
		struct bitmap *bitmap, colour bg,
		bool repeat_x, bool repeat_y, struct content *content);
static void nsgtk_set_solid(void);	/**< Set for drawing solid lines */
static void nsgtk_set_dotted(void);	/**< Set for drawing dotted lines */
static void nsgtk_set_dashed(void);	/**< Set for drawing dashed lines */

static GdkRectangle cliprect;
static float nsgtk_plot_scale = 1.0;

struct plotter_table plot;

const struct plotter_table nsgtk_plotters = {
	nsgtk_plot_clg,
	nsgtk_plot_rectangle,
	nsgtk_plot_line,
	nsgtk_plot_polygon,
	nsgtk_plot_fill,
	nsgtk_plot_clip,
	nsgtk_plot_text,
	nsgtk_plot_disc,
	nsgtk_plot_arc,
	nsgtk_plot_bitmap,
	nsgtk_plot_bitmap_tile,
	NULL,
	NULL,
	NULL,
	nsgtk_plot_path,
	true
};


bool nsgtk_plot_clg(colour c)
{
	return true;
}

bool nsgtk_plot_rectangle(int x0, int y0, int width, int height,
		int line_width, colour c, bool dotted, bool dashed)
{
	nsgtk_set_colour(c);
        if (dotted)
                nsgtk_set_dotted();
        else if (dashed)
                nsgtk_set_dashed();
        else
                nsgtk_set_solid();

	if (line_width == 0)
		line_width = 1;

	cairo_set_line_width(current_cr, line_width);
	cairo_rectangle(current_cr, x0 + 0.5, y0 + 0.5, width, height);
	cairo_stroke(current_cr);

	return true;
}


bool nsgtk_plot_line(int x0, int y0, int x1, int y1, int width,
		colour c, bool dotted, bool dashed)
{
	nsgtk_set_colour(c);
	if (dotted)
		nsgtk_set_dotted();
	else if (dashed)
		nsgtk_set_dashed();
	else
		nsgtk_set_solid();

	if (width == 0)
		width = 1;

	cairo_set_line_width(current_cr, width);
	cairo_move_to(current_cr, x0 + 0.5, y0 + 0.5);
	cairo_line_to(current_cr, x1 + 0.5, y1 + 0.5);
	cairo_stroke(current_cr);

	return true;
}


bool nsgtk_plot_polygon(const int *p, unsigned int n, colour fill)
{
	unsigned int i;

	nsgtk_set_colour(fill);
	nsgtk_set_solid();

	cairo_set_line_width(current_cr, 0);
	cairo_move_to(current_cr, p[0], p[1]);
	for (i = 1; i != n; i++) {
		cairo_line_to(current_cr, p[i * 2], p[i * 2 + 1]);
	}
	cairo_fill(current_cr);
	cairo_stroke(current_cr);

	return true;
}


bool nsgtk_plot_fill(int x0, int y0, int x1, int y1, colour c)
{
	nsgtk_set_colour(c);
	nsgtk_set_solid();

	cairo_set_line_width(current_cr, 0);
	cairo_rectangle(current_cr, x0, y0, x1 - x0, y1 - y0);
	cairo_fill(current_cr);
	cairo_stroke(current_cr);

	return true;
}


bool nsgtk_plot_clip(int clip_x0, int clip_y0,
		int clip_x1, int clip_y1)
{
	cairo_reset_clip(current_cr);
	cairo_rectangle(current_cr, clip_x0, clip_y0,
			clip_x1 - clip_x0, clip_y1 - clip_y0);
	cairo_clip(current_cr);

	cliprect.x = clip_x0;
	cliprect.y = clip_y0;
	cliprect.width = clip_x1 - clip_x0;
	cliprect.height = clip_y1 - clip_y0;
	gdk_gc_set_clip_rectangle(current_gc, &cliprect);

	return true;
}


bool nsgtk_plot_text(int x, int y, const struct css_style *style,
		const char *text, size_t length, colour bg, colour c)
{
	return nsfont_paint(style, text, length, x, y, c);
}


bool nsgtk_plot_disc(int x, int y, int radius, colour c, bool filled)
{
	nsgtk_set_colour(c);
	nsgtk_set_solid();

	if (filled)
		cairo_set_line_width(current_cr, 0);
	else
		cairo_set_line_width(current_cr, 1);

	cairo_arc(current_cr, x, y, radius, 0, M_PI * 2);

	if (filled)
		cairo_fill(current_cr);

	cairo_stroke(current_cr);

	return true;
}

bool nsgtk_plot_arc(int x, int y, int radius, int angle1, int angle2, colour c)
{
	nsgtk_set_colour(c);
	nsgtk_set_solid();

	cairo_set_line_width(current_cr, 1);
	cairo_arc(current_cr, x, y, radius,
			(angle1 + 90) * (M_PI / 180),
			(angle2 + 90) * (M_PI / 180));
	cairo_stroke(current_cr);

	return true;
}

static bool nsgtk_plot_pixbuf(int x, int y, int width, int height,
                              GdkPixbuf *pixbuf, colour bg)
{
	/* XXX: This currently ignores the background colour supplied.
	 * Does this matter?
	 */

	if (width == 0 || height == 0)
		return true;

	if (gdk_pixbuf_get_width(pixbuf) == width &&
			gdk_pixbuf_get_height(pixbuf) == height) {
		gdk_draw_pixbuf(current_drawable, current_gc,
				pixbuf,
				0, 0,
				x, y,
				width, height,
				GDK_RGB_DITHER_MAX, 0, 0);

	} else {
		GdkPixbuf *scaled;
		scaled = gdk_pixbuf_scale_simple(pixbuf,
				width, height,
				option_render_resample ? GDK_INTERP_BILINEAR
							: GDK_INTERP_NEAREST);
		if (!scaled)
			return false;

		gdk_draw_pixbuf(current_drawable, current_gc,
				scaled,
				0, 0,
				x, y,
				width, height,
				GDK_RGB_DITHER_MAX, 0, 0);

		g_object_unref(scaled);
	}

	return true;
}

bool nsgtk_plot_bitmap(int x, int y, int width, int height,
		struct bitmap *bitmap, colour bg, struct content *content)
{
	GdkPixbuf *pixbuf = gtk_bitmap_get_primary(bitmap);
	return nsgtk_plot_pixbuf(x, y, width, height, pixbuf, bg);
}

bool nsgtk_plot_bitmap_tile(int x, int y, int width, int height,
		struct bitmap *bitmap, colour bg,
		bool repeat_x, bool repeat_y, struct content *content)
{
	int doneheight = 0, donewidth = 0;
	GdkPixbuf *primary;
	GdkPixbuf *pretiled = NULL;

	if (!(repeat_x || repeat_y)) {
		/* Not repeating at all, so just pass it on */
		return nsgtk_plot_bitmap(x,y,width,height,bitmap,bg,content);
	}

	if (repeat_x && !repeat_y)
		pretiled = gtk_bitmap_get_pretile_x(bitmap);
	if (repeat_x && repeat_y)
		pretiled = gtk_bitmap_get_pretile_xy(bitmap);
	if (!repeat_x && repeat_y)
		pretiled = gtk_bitmap_get_pretile_y(bitmap);
	
	assert(pretiled != NULL);
	
	primary = gtk_bitmap_get_primary(bitmap);
	/* use the primary and pretiled widths to scale the w/h provided */
	width *= gdk_pixbuf_get_width(pretiled);
	width /= gdk_pixbuf_get_width(primary);
	height *= gdk_pixbuf_get_height(pretiled);
	height /= gdk_pixbuf_get_height(primary);

	if (y > cliprect.y)
		doneheight = (cliprect.y - height) + ((y - cliprect.y) % height);
	else
		doneheight = y;

	while (doneheight < (cliprect.y + cliprect.height)) {
		if (x > cliprect.x)
			donewidth = (cliprect.x - width) + ((x - cliprect.x) % width);
		else
			donewidth = x;
		while (donewidth < (cliprect.x + cliprect.width)) {
			nsgtk_plot_pixbuf(donewidth, doneheight,
                                          width, height, pretiled, bg);
			donewidth += width;
			if (!repeat_x) break;
		}
		doneheight += height;
		if (!repeat_y) break;
	}

	return true;
}

bool nsgtk_plot_path(const float *p, unsigned int n, colour fill, float width,
                colour c, const float transform[6])
{
	unsigned int i;
	cairo_matrix_t old_ctm, n_ctm;

	if (n == 0)
		return true;

	if (p[0] != PLOTTER_PATH_MOVE) {
		LOG(("Path does not start with move"));
		return false;
	}


	/* Save CTM */
	cairo_get_matrix(current_cr, &old_ctm);

	/* Set up line style and width */
	cairo_set_line_width(current_cr, 1);
	nsgtk_set_solid();

	/* Load new CTM */
	n_ctm.xx = transform[0];
	n_ctm.yx = transform[1];
	n_ctm.xy = transform[2];
	n_ctm.yy = transform[3];
	n_ctm.x0 = transform[4];
	n_ctm.y0 = transform[5];

	cairo_set_matrix(current_cr, &n_ctm);

	/* Construct path */
	for (i = 0; i < n; ) {
		if (p[i] == PLOTTER_PATH_MOVE) {
			cairo_move_to(current_cr, p[i+1], p[i+2]);
			i += 3;
		} else if (p[i] == PLOTTER_PATH_CLOSE) {
			cairo_close_path(current_cr);
			i++;
		} else if (p[i] == PLOTTER_PATH_LINE) {
			cairo_line_to(current_cr, p[i+1], p[i+2]);
			i += 3;
		} else if (p[i] == PLOTTER_PATH_BEZIER) {
			cairo_curve_to(current_cr, p[i+1], p[i+2],
					p[i+3], p[i+4],
					p[i+5], p[i+6]);
			i += 7;
		} else {
			LOG(("bad path command %f", p[i]));
			/* Reset matrix for safety */
			cairo_set_matrix(current_cr, &old_ctm);
			return false;
		}
	}

	/* Restore original CTM */
	cairo_set_matrix(current_cr, &old_ctm);

	/* Now draw path */
	if (fill != TRANSPARENT) {
		nsgtk_set_colour(fill);

		if (c != TRANSPARENT) {
			/* Fill & Stroke */
			cairo_fill_preserve(current_cr);
			nsgtk_set_colour(c);
			cairo_stroke(current_cr);
		} else {
			/* Fill only */
			cairo_fill(current_cr);
		}
	} else if (c != TRANSPARENT) {
		/* Stroke only */
		nsgtk_set_colour(c);
		cairo_stroke(current_cr);
	}

	return true;
}

void nsgtk_set_colour(colour c)
{
	int r, g, b;
	GdkColor colour;

	r = c & 0xff;
	g = (c & 0xff00) >> 8;
	b = (c & 0xff0000) >> 16;

	colour.red = r | (r << 8);
	colour.green = g | (g << 8);
	colour.blue = b | (b << 8);
	colour.pixel = (r << 16) | (g << 8) | b;

	gdk_color_alloc(gdk_colormap_get_system(),
			&colour);
	gdk_gc_set_foreground(current_gc, &colour);

	cairo_set_source_rgba(current_cr, r / 255.0,
			g / 255.0, b / 255.0, 1.0);
}

void nsgtk_set_solid()
{
	double dashes = 0;
	
	cairo_set_dash(current_cr, &dashes, 0, 0);
}

void nsgtk_set_dotted()
{
	double cdashes = 1;

	cairo_set_dash(current_cr, &cdashes, 1, 0);
}

void nsgtk_set_dashed()
{
	double cdashes = 3;

	cairo_set_dash(current_cr, &cdashes, 1, 0);
}

void nsgtk_plot_set_scale(float s)
{
	nsgtk_plot_scale = s;
}

float nsgtk_plot_get_scale(void)
{
	return nsgtk_plot_scale;
}

/** Plot a caret.  It is assumed that the plotters have been set up. */
void nsgtk_plot_caret(int x, int y, int h)
{
	GdkColor colour;

	colour.red = 0;
	colour.green = 0;
	colour.blue = 0;
	colour.pixel = 0;
	gdk_color_alloc(gdk_colormap_get_system(),
			&colour);
	gdk_gc_set_foreground(current_gc, &colour);

	gdk_draw_line(current_drawable, current_gc,
			x, y,
			x, y + h - 1);
}