summaryrefslogtreecommitdiff
path: root/glamor/glamor_text.c
blob: cf165cad87decc3aef315ecd18fe927db054608b (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
/*
 * Copyright © 2014 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include "glamor_priv.h"
#include <dixfontstr.h>
#include "glamor_transform.h"

/*
 * Fill in the array of charinfo pointers for the provided characters. For
 * missing characters, place a NULL in the array so that the charinfo array
 * aligns exactly with chars
 */

static void
glamor_get_glyphs(FontPtr font, glamor_font_t *glamor_font,
                  int count, char *chars, Bool sixteen, CharInfoPtr *charinfo)
{
    unsigned long nglyphs;
    FontEncoding encoding;
    int char_step;
    int c;

    if (sixteen) {
        char_step = 2;
        if (FONTLASTROW(font) == 0)
            encoding = Linear16Bit;
        else
            encoding = TwoD16Bit;
    } else {
        char_step = 1;
        encoding = Linear8Bit;
    }

    /* If the font has a default character, then we shouldn't have to
     * worry about missing glyphs, so just get the whole string all at
     * once. Otherwise, we have to fetch chars one at a time to notice
     * missing ones.
     */
    if (glamor_font->default_char) {
        GetGlyphs(font, (unsigned long) count, (unsigned char *) chars,
                  encoding, &nglyphs, charinfo);

        /* Make sure it worked. There's a bug in libXfont through
         * version 1.4.7 which would cause it to fail when the font is
         * a 2D font without a first row, and the application sends a
         * 1-d request. In this case, libXfont would return zero
         * glyphs, even when the font had a default character.
         *
         * It's easy enough for us to work around that bug here by
         * simply checking the returned nglyphs and falling through to
         * the one-at-a-time code below. Not doing this check would
         * result in uninitialized memory accesses in the rendering code.
         */
        if (nglyphs == count)
            return;
    }

    for (c = 0; c < count; c++) {
        GetGlyphs(font, 1, (unsigned char *) chars,
                  encoding, &nglyphs, &charinfo[c]);
        if (!nglyphs)
            charinfo[c] = NULL;
        chars += char_step;
    }
}

/*
 * Construct quads for the provided list of characters and draw them
 */

static int
glamor_text(DrawablePtr drawable, GCPtr gc,
            glamor_font_t *glamor_font,
            glamor_program *prog,
            int x, int y,
            int count, char *s_chars, CharInfoPtr *charinfo,
            Bool sixteen)
{
    unsigned char *chars = (unsigned char *) s_chars;
    FontPtr font = gc->font;
    int off_x, off_y;
    int c;
    int nglyph;
    GLshort *v;
    char *vbo_offset;
    CharInfoPtr ci;
    int firstRow = font->info.firstRow;
    int firstCol = font->info.firstCol;
    int glyph_spacing_x = glamor_font->glyph_width_bytes * 8;
    int glyph_spacing_y = glamor_font->glyph_height;
    int box_index;
    PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
    glamor_pixmap_private *pixmap_priv = glamor_get_pixmap_private(pixmap);

    /* Set the font as texture 1 */

    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, glamor_font->texture_id);
    glUniform1i(prog->font_uniform, 1);

    /* Set up the vertex buffers for the font and destination */

    v = glamor_get_vbo_space(drawable->pScreen, count * (6 * sizeof (GLshort)), &vbo_offset);

    glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
    glVertexAttribDivisor(GLAMOR_VERTEX_POS, 1);
    glVertexAttribPointer(GLAMOR_VERTEX_POS, 4, GL_SHORT, GL_FALSE,
                          6 * sizeof (GLshort), vbo_offset);

    glEnableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
    glVertexAttribDivisor(GLAMOR_VERTEX_SOURCE, 1);
    glVertexAttribPointer(GLAMOR_VERTEX_SOURCE, 2, GL_SHORT, GL_FALSE,
                          6 * sizeof (GLshort), vbo_offset + 4 * sizeof (GLshort));

    /* Set the vertex coordinates */
    nglyph = 0;

    for (c = 0; c < count; c++) {
        if ((ci = *charinfo++)) {
            int     x1 = x + ci->metrics.leftSideBearing;
            int     y1 = y - ci->metrics.ascent;
            int     width = GLYPHWIDTHPIXELS(ci);
            int     height = GLYPHHEIGHTPIXELS(ci);
            int     tx, ty = 0;
            int     row = 0, col;
            int     second_row = 0;
            x += ci->metrics.characterWidth;

            if (sixteen) {
                if (ci == glamor_font->default_char) {
                    row = glamor_font->default_row;
                    col = glamor_font->default_col;
                } else {
                    row = chars[0];
                    col = chars[1];
                }
                if (FONTLASTROW(font) != 0) {
                    ty = ((row - firstRow) / 2) * glyph_spacing_y;
                    second_row = (row - firstRow) & 1;
                }
                else
                    col += row << 8;
            } else {
                if (ci == glamor_font->default_char)
                    col = glamor_font->default_col;
                else
                    col = chars[0];
            }

            tx = (col - firstCol) * glyph_spacing_x;
            /* adjust for second row layout */
            tx += second_row * glamor_font->row_width * 8;

            v[ 0] = x1;
            v[ 1] = y1;
            v[ 2] = width;
            v[ 3] = height;
            v[ 4] = tx;
            v[ 5] = ty;

            v += 6;
            nglyph++;
        }
        chars += 1 + sixteen;
    }
    glamor_put_vbo_space(drawable->pScreen);

    if (nglyph != 0) {

        glEnable(GL_SCISSOR_TEST);

        glamor_pixmap_loop(pixmap_priv, box_index) {
            BoxPtr box = RegionRects(gc->pCompositeClip);
            int nbox = RegionNumRects(gc->pCompositeClip);

            glamor_set_destination_drawable(drawable, box_index, TRUE, FALSE,
                                            prog->matrix_uniform,
                                            &off_x, &off_y);

            /* Run over the clip list, drawing the glyphs
             * in each box
             */

            while (nbox--) {
                glScissor(box->x1 + off_x,
                          box->y1 + off_y,
                          box->x2 - box->x1,
                          box->y2 - box->y1);
                box++;
                glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, nglyph);
            }
        }
        glDisable(GL_SCISSOR_TEST);
    }

    glVertexAttribDivisor(GLAMOR_VERTEX_SOURCE, 0);
    glDisableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
    glVertexAttribDivisor(GLAMOR_VERTEX_POS, 0);
    glDisableVertexAttribArray(GLAMOR_VERTEX_POS);

    return x;
}

static const char vs_vars_text[] =
    "attribute vec4 primitive;\n"
    "attribute vec2 source;\n"
    "varying vec2 glyph_pos;\n";

static const char vs_exec_text[] =
    "       vec2 pos = primitive.zw * vec2(gl_VertexID&1, (gl_VertexID&2)>>1);\n"
    GLAMOR_POS(gl_Position, (primitive.xy + pos))
    "       glyph_pos = source + pos;\n";

static const char fs_vars_text[] =
    "varying vec2 glyph_pos;\n";

static const char fs_exec_text[] =
    "       ivec2 itile_texture = ivec2(glyph_pos);\n"
    "       uint x = uint(itile_texture.x & 7);\n"
    "       itile_texture.x >>= 3;\n"
    "       uint texel = texelFetch(font, itile_texture, 0).x;\n"
    "       uint bit = (texel >> x) & uint(1);\n"
    "       if (bit == uint(0))\n"
    "               discard;\n";

static const char fs_exec_te[] =
    "       ivec2 itile_texture = ivec2(glyph_pos);\n"
    "       uint x = uint(itile_texture.x & 7);\n"
    "       itile_texture.x >>= 3;\n"
    "       uint texel = texelFetch(font, itile_texture, 0).x;\n"
    "       uint bit = (texel >> x) & uint(1);\n"
    "       if (bit == uint(0))\n"
    "               gl_FragColor = bg;\n"
    "       else\n"
    "               gl_FragColor = fg;\n";

static const glamor_facet glamor_facet_poly_text = {
    .name = "poly_text",
    .version = 130,
    .vs_vars = vs_vars_text,
    .vs_exec = vs_exec_text,
    .fs_vars = fs_vars_text,
    .fs_exec = fs_exec_text,
    .source_name = "source",
    .locations = glamor_program_location_font,
};

static Bool
glamor_poly_text(DrawablePtr drawable, GCPtr gc,
                 int x, int y, int count, char *chars, Bool sixteen, int *final_pos)
{
    ScreenPtr screen = drawable->pScreen;
    glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
    PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
    glamor_program *prog;
    glamor_pixmap_private *pixmap_priv;
    glamor_font_t *glamor_font;
    CharInfoPtr charinfo[255];  /* encoding only has 1 byte for count */

    glamor_font = glamor_font_get(drawable->pScreen, gc->font);
    if (!glamor_font)
        goto bail;

    glamor_get_glyphs(gc->font, glamor_font, count, chars, sixteen, charinfo);

    pixmap_priv = glamor_get_pixmap_private(pixmap);
    if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
        goto bail;

    glamor_make_current(glamor_priv);

    prog = glamor_use_program_fill(pixmap, gc, &glamor_priv->poly_text_progs, &glamor_facet_poly_text);

    if (!prog)
        goto bail;

    x = glamor_text(drawable, gc, glamor_font, prog,
                    x, y, count, chars, charinfo, sixteen);

    *final_pos = x;
    return TRUE;

bail:
    return FALSE;
}

int
glamor_poly_text8(DrawablePtr drawable, GCPtr gc,
                   int x, int y, int count, char *chars)
{
    int final_pos;

    if (glamor_poly_text(drawable, gc, x, y, count, chars, FALSE, &final_pos))
        return final_pos;
    return miPolyText8(drawable, gc, x, y, count, chars);
}

int
glamor_poly_text16(DrawablePtr drawable, GCPtr gc,
                    int x, int y, int count, unsigned short *chars)
{
    int final_pos;

    if (glamor_poly_text(drawable, gc, x, y, count, (char *) chars, TRUE, &final_pos))
        return final_pos;
    return miPolyText16(drawable, gc, x, y, count, chars);
}

/*
 * Draw image text, which is always solid in copy mode and has the
 * background cleared while painting the text. For fonts which have
 * their bitmap metrics exactly equal to the area to clear, we can use
 * the accelerated version which paints both fg and bg at the same
 * time. Otherwise, clear the whole area and then paint the glyphs on
 * top
 */

static const glamor_facet glamor_facet_image_text = {
    .name = "image_text",
    .version = 130,
    .vs_vars = vs_vars_text,
    .vs_exec = vs_exec_text,
    .fs_vars = fs_vars_text,
    .fs_exec = fs_exec_text,
    .source_name = "source",
    .locations = glamor_program_location_font,
};

static Bool
use_image_solid(PixmapPtr pixmap, GCPtr gc, glamor_program *prog, void *arg)
{
    return glamor_set_solid(pixmap, gc, FALSE, prog->fg_uniform);
}

static const glamor_facet glamor_facet_image_fill = {
    .name = "solid",
    .fs_exec = "       gl_FragColor = fg;\n",
    .locations = glamor_program_location_fg,
    .use = use_image_solid,
};

static Bool
glamor_te_text_use(PixmapPtr pixmap, GCPtr gc, glamor_program *prog, void *arg)
{
    if (!glamor_set_solid(pixmap, gc, FALSE, prog->fg_uniform))
        return FALSE;
    glamor_set_color(pixmap, gc->bgPixel, prog->bg_uniform);
    return TRUE;
}

static const glamor_facet glamor_facet_te_text = {
    .name = "te_text",
    .version = 130,
    .vs_vars = vs_vars_text,
    .vs_exec = vs_exec_text,
    .fs_vars = fs_vars_text,
    .fs_exec = fs_exec_te,
    .locations = glamor_program_location_fg | glamor_program_location_bg | glamor_program_location_font,
    .source_name = "source",
    .use = glamor_te_text_use,
};

static Bool
glamor_image_text(DrawablePtr drawable, GCPtr gc,
                  int x, int y, int count, char *chars,
                  Bool sixteen)
{
    ScreenPtr screen = drawable->pScreen;
    glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
    PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
    glamor_program *prog;
    glamor_pixmap_private *pixmap_priv;
    glamor_font_t *glamor_font;
    const glamor_facet *prim_facet;
    const glamor_facet *fill_facet;
    CharInfoPtr charinfo[255];  /* encoding only has 1 byte for count */

    pixmap_priv = glamor_get_pixmap_private(pixmap);
    if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
        return FALSE;

    glamor_font = glamor_font_get(drawable->pScreen, gc->font);
    if (!glamor_font)
        return FALSE;

    glamor_get_glyphs(gc->font, glamor_font, count, chars, sixteen, charinfo);

    glamor_make_current(glamor_priv);

    if (TERMINALFONT(gc->font))
        prog = &glamor_priv->te_text_prog;
    else
        prog = &glamor_priv->image_text_prog;

    if (prog->failed)
        goto bail;

    if (!prog->prog) {
        if (TERMINALFONT(gc->font)) {
            prim_facet = &glamor_facet_te_text;
            fill_facet = NULL;
        } else {
            prim_facet = &glamor_facet_image_text;
            fill_facet = &glamor_facet_image_fill;
        }

        if (!glamor_build_program(screen, prog, prim_facet, fill_facet, NULL, NULL))
            goto bail;
    }

    if (!TERMINALFONT(gc->font)) {
        int width = 0;
        int c;
        RegionRec region;
        BoxRec box;
        int off_x, off_y;

        /* Check planemask before drawing background to
         * bail early if it's not OK
         */
        if (!glamor_set_planemask(gc->depth, gc->planemask))
            goto bail;
        for (c = 0; c < count; c++)
            if (charinfo[c])
                width += charinfo[c]->metrics.characterWidth;

        glamor_get_drawable_deltas(drawable, pixmap, &off_x, &off_y);

        if (width >= 0) {
            box.x1 = drawable->x + x;
            box.x2 = drawable->x + x + width;
        } else {
            box.x1 = drawable->x + x + width;
            box.x2 = drawable->x + x;
        }
        box.y1 = drawable->y + y - gc->font->info.fontAscent;
        box.y2 = drawable->y + y + gc->font->info.fontDescent;
        RegionInit(&region, &box, 1);
        RegionIntersect(&region, &region, gc->pCompositeClip);
        RegionTranslate(&region, off_x, off_y);
        glamor_solid_boxes(pixmap, RegionRects(&region), RegionNumRects(&region), gc->bgPixel);
        RegionUninit(&region);
    }

    if (!glamor_use_program(pixmap, gc, prog, NULL))
        goto bail;

    (void) glamor_text(drawable, gc, glamor_font, prog,
                       x, y, count, chars, charinfo, sixteen);

    return TRUE;

bail:
    return FALSE;
}

void
glamor_image_text8(DrawablePtr drawable, GCPtr gc,
                   int x, int y, int count, char *chars)
{
    if (!glamor_image_text(drawable, gc, x, y, count, chars, FALSE))
        miImageText8(drawable, gc, x, y, count, chars);
}

void
glamor_image_text16(DrawablePtr drawable, GCPtr gc,
                    int x, int y, int count, unsigned short *chars)
{
    if (!glamor_image_text(drawable, gc, x, y, count, (char *) chars, TRUE))
        miImageText16(drawable, gc, x, y, count, chars);
}