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IABSD.fr/xenocara/xserver/glamor/glamor_text.c
matthieu
- xserver/glamor/glamor_text.c
-
/* * 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(®ion, &box, 1); RegionIntersect(®ion, ®ion, gc->pCompositeClip); RegionTranslate(®ion, off_x, off_y); glamor_solid_boxes(pixmap, RegionRects(®ion), RegionNumRects(®ion), gc->bgPixel); RegionUninit(®ion); } 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); }