src/gallium/state_trackers/vega/text.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 LunarG, Inc.  All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  **************************************************************************/
  26
  27 #include "util/u_memory.h"
  28 #include "cso_cache/cso_hash.h"
  29
  30 #include "text.h"
  31 #include "image.h"
  32 #include "path.h"
  33
  34 #ifdef OPENVG_VERSION_1_1
  35
  36 struct vg_font {
  37    struct vg_object base;
  38    struct cso_hash *glyphs;
  39 };
  40
  41 struct vg_glyph {
  42    struct vg_object *object; /* it could be NULL */
  43    VGboolean is_hinted;
  44    VGfloat glyph_origin[2];
  45    VGfloat escapement[2];
  46 };
  47
  48 static VGboolean del_glyph(struct vg_font *font,
  49                            VGuint glyphIndex)
  50 {
  51    struct vg_glyph *glyph;
  52
  53    glyph = (struct vg_glyph *)
  54       cso_hash_take(font->glyphs, (unsigned) glyphIndex);
  55    if (glyph)
  56       FREE(glyph);
  57
  58    return (glyph != NULL);
  59 }
  60
  61 static void add_glyph(struct vg_font *font,
  62                       VGuint glyphIndex,
  63                       struct vg_object *obj,
  64                       VGboolean isHinted,
  65                       const VGfloat glyphOrigin[2],
  66                       const VGfloat escapement[2])
  67 {
  68    struct vg_glyph *glyph;
  69
  70    /* remove the existing one */
  71    del_glyph(font, glyphIndex);
  72
  73    glyph = CALLOC_STRUCT(vg_glyph);
  74    glyph->object = obj;
  75    glyph->is_hinted = isHinted;
  76    memcpy(glyph->glyph_origin, glyphOrigin, sizeof(glyph->glyph_origin));
  77    memcpy(glyph->escapement, escapement, sizeof(glyph->glyph_origin));
  78
  79    cso_hash_insert(font->glyphs, (unsigned) glyphIndex, glyph);
  80 }
  81
  82 static struct vg_glyph *get_glyph(struct vg_font *font,
  83                                   VGuint glyphIndex)
  84 {
  85    struct cso_hash_iter iter;
  86
  87    iter = cso_hash_find(font->glyphs, (unsigned) glyphIndex);
  88    return (struct vg_glyph *) cso_hash_iter_data(iter);
  89 }
  90
  91 static void vg_render_glyph(struct vg_context *ctx,
  92                             struct vg_glyph *glyph,
  93                             VGbitfield paintModes,
  94                             VGboolean allowAutoHinting)
  95 {
  96    if (glyph->object && paintModes) {
  97       struct vg_state *state = &ctx->state.vg;
  98       struct matrix m;
  99
 100       m = state->glyph_user_to_surface_matrix;
 101       matrix_translate(&m,
 102             state->glyph_origin[0].f - glyph->glyph_origin[0],
 103             state->glyph_origin[1].f - glyph->glyph_origin[1]);
 104
 105       if (glyph->object->type == VG_OBJECT_PATH) {
 106          path_render((struct path *) glyph->object, paintModes, &m);
 107       }
 108       else {
 109          assert(glyph->object->type == VG_OBJECT_IMAGE);
 110          image_draw((struct vg_image *) glyph->object, &m);
 111       }
 112    }
 113 }
 114
 115 static void vg_advance_glyph(struct vg_context *ctx,
 116                              struct vg_glyph *glyph,
 117                              VGfloat adjustment_x,
 118                              VGfloat adjustment_y,
 119                              VGboolean last)
 120 {
 121    struct vg_value *glyph_origin = ctx->state.vg.glyph_origin;
 122
 123    glyph_origin[0].f += glyph->escapement[0] + adjustment_x;
 124    glyph_origin[1].f += glyph->escapement[1] + adjustment_y;
 125
 126    if (last) {
 127       glyph_origin[0].i = float_to_int_floor(glyph_origin[0].f);
 128       glyph_origin[1].i = float_to_int_floor(glyph_origin[1].f);
 129    }
 130 }
 131
 132 struct vg_font *font_create(VGint glyphCapacityHint)
 133 {
 134    struct vg_context *ctx = vg_current_context();
 135    struct vg_font *font;
 136
 137    font = CALLOC_STRUCT(vg_font);
 138    vg_init_object(&font->base, ctx, VG_OBJECT_FONT);
 139    font->glyphs = cso_hash_create();
 140
 141    vg_context_add_object(ctx, &font->base);
 142
 143    return font;
 144 }
 145
 146 void font_destroy(struct vg_font *font)
 147 {
 148    struct vg_context *ctx = vg_current_context();
 149    struct cso_hash_iter iter;
 150
 151    vg_context_remove_object(ctx, &font->base);
 152
 153    iter = cso_hash_first_node(font->glyphs);
 154    while (!cso_hash_iter_is_null(iter)) {
 155       struct vg_glyph *glyph = (struct vg_glyph *) cso_hash_iter_data(iter);
 156       FREE(glyph);
 157       iter = cso_hash_iter_next(iter);
 158    }
 159    cso_hash_delete(font->glyphs);
 160
 161    FREE(font);
 162 }
 163
 164 void font_set_glyph_to_path(struct vg_font *font,
 165                             VGuint glyphIndex,
 166                             struct path *path,
 167                             VGboolean isHinted,
 168                             const VGfloat glyphOrigin[2],
 169                             const VGfloat escapement[2])
 170 {
 171    add_glyph(font, glyphIndex, (struct vg_object *) path,
 172          isHinted, glyphOrigin, escapement);
 173 }
 174
 175 void font_set_glyph_to_image(struct vg_font *font,
 176                              VGuint glyphIndex,
 177                              struct vg_image *image,
 178                              const VGfloat glyphOrigin[2],
 179                              const VGfloat escapement[2])
 180 {
 181    add_glyph(font, glyphIndex, (struct vg_object *) image,
 182          VG_TRUE, glyphOrigin, escapement);
 183 }
 184
 185 void font_clear_glyph(struct vg_font *font,
 186                       VGuint glyphIndex)
 187 {
 188    if (!del_glyph(font, glyphIndex)) {
 189       struct vg_context *ctx = vg_current_context();
 190       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 191    }
 192 }
 193
 194 void font_draw_glyph(struct vg_font *font,
 195                      VGuint glyphIndex,
 196                      VGbitfield paintModes,
 197                      VGboolean allowAutoHinting)
 198 {
 199    struct vg_context *ctx = vg_current_context();
 200    struct vg_glyph *glyph;
 201
 202    glyph = get_glyph(font, glyphIndex);
 203    if (!glyph) {
 204       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 205       return;
 206    }
 207
 208    vg_render_glyph(ctx, glyph, paintModes, allowAutoHinting);
 209    vg_advance_glyph(ctx, glyph, 0.0f, 0.0f, VG_TRUE);
 210 }
 211
 212 void font_draw_glyphs(struct vg_font *font,
 213                       VGint glyphCount,
 214                       const VGuint *glyphIndices,
 215                       const VGfloat *adjustments_x,
 216                       const VGfloat *adjustments_y,
 217                       VGbitfield paintModes,
 218                       VGboolean allowAutoHinting)
 219 {
 220    struct vg_context *ctx = vg_current_context();
 221    VGint i;
 222
 223    for (i = 0; i < glyphCount; ++i) {
 224       if (!get_glyph(font, glyphIndices[i])) {
 225          vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 226          return;
 227       }
 228    }
 229
 230    for (i = 0; i < glyphCount; ++i) {
 231       struct vg_glyph *glyph;
 232       VGfloat adj_x, adj_y;
 233
 234       glyph = get_glyph(font, glyphIndices[i]);
 235
 236       vg_render_glyph(ctx, glyph, paintModes, allowAutoHinting);
 237
 238       adj_x = (adjustments_x) ? adjustments_x[i] : 0.0f;
 239       adj_y = (adjustments_y) ? adjustments_y[i] : 0.0f;
 240       vg_advance_glyph(ctx, glyph, adj_x, adj_y, (i == glyphCount - 1));
 241    }
 242 }
 243
 244 VGint font_num_glyphs(struct vg_font *font)
 245 {
 246    return cso_hash_size(font->glyphs);
 247 }
 248
 249 #endif /* OPENVG_VERSION_1_1 */