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 #include "api.h"
  34
  35 #ifdef OPENVG_VERSION_1_1
  36
  37 struct vg_font {
  38    struct vg_object base;
  39    struct cso_hash *glyphs;
  40 };
  41
  42 struct vg_glyph {
  43    struct vg_object *object; /* it could be NULL */
  44    VGboolean is_hinted;
  45    VGfloat glyph_origin[2];
  46    VGfloat escapement[2];
  47 };
  48
  49 static VGboolean del_glyph(struct vg_font *font,
  50                            VGuint glyphIndex)
  51 {
  52    struct vg_glyph *glyph;
  53
  54    glyph = (struct vg_glyph *)
  55       cso_hash_take(font->glyphs, (unsigned) glyphIndex);
  56    if (glyph)
  57       FREE(glyph);
  58
  59    return (glyph != NULL);
  60 }
  61
  62 static void add_glyph(struct vg_font *font,
  63                       VGuint glyphIndex,
  64                       struct vg_object *obj,
  65                       VGboolean isHinted,
  66                       const VGfloat glyphOrigin[2],
  67                       const VGfloat escapement[2])
  68 {
  69    struct vg_glyph *glyph;
  70
  71    /* remove the existing one */
  72    del_glyph(font, glyphIndex);
  73
  74    glyph = CALLOC_STRUCT(vg_glyph);
  75    glyph->object = obj;
  76    glyph->is_hinted = isHinted;
  77    memcpy(glyph->glyph_origin, glyphOrigin, sizeof(glyphOrigin));
  78    memcpy(glyph->escapement, escapement, sizeof(escapement));
  79
  80    cso_hash_insert(font->glyphs, (unsigned) glyphIndex, glyph);
  81 }
  82
  83 static struct vg_glyph *get_glyph(struct vg_font *font,
  84                                   VGuint glyphIndex)
  85 {
  86    struct cso_hash_iter iter;
  87
  88    iter = cso_hash_find(font->glyphs, (unsigned) glyphIndex);
  89    return (struct vg_glyph *) cso_hash_iter_data(iter);
  90 }
  91
  92 static void vg_render_glyph(struct vg_context *ctx,
  93                             struct vg_glyph *glyph,
  94                             VGbitfield paintModes,
  95                             VGboolean allowAutoHinting)
  96 {
  97    if (glyph->object && paintModes) {
  98       struct vg_state *state = &ctx->state.vg;
  99       struct matrix m;
 100
 101       m = state->glyph_user_to_surface_matrix;
 102       matrix_translate(&m,
 103             state->glyph_origin[0].f - glyph->glyph_origin[0],
 104             state->glyph_origin[1].f - glyph->glyph_origin[1]);
 105
 106       if (glyph->object->type == VG_OBJECT_PATH) {
 107          path_render((struct path *) glyph->object, paintModes, &m);
 108       }
 109       else {
 110          assert(glyph->object->type == VG_OBJECT_IMAGE);
 111          image_draw((struct vg_image *) glyph->object, &m);
 112       }
 113    }
 114 }
 115
 116 static void vg_advance_glyph(struct vg_context *ctx,
 117                              struct vg_glyph *glyph,
 118                              VGfloat adjustment_x,
 119                              VGfloat adjustment_y,
 120                              VGboolean last)
 121 {
 122    struct vg_value *glyph_origin = ctx->state.vg.glyph_origin;
 123
 124    glyph_origin[0].f += glyph->escapement[0] + adjustment_x;
 125    glyph_origin[1].f += glyph->escapement[1] + adjustment_y;
 126
 127    if (last) {
 128       glyph_origin[0].i = float_to_int_floor(glyph_origin[0].f);
 129       glyph_origin[1].i = float_to_int_floor(glyph_origin[1].f);
 130    }
 131 }
 132
 133 struct vg_font *font_create(VGint glyphCapacityHint)
 134 {
 135    struct vg_context *ctx = vg_current_context();
 136    struct vg_font *font;
 137
 138    font = CALLOC_STRUCT(vg_font);
 139    vg_init_object(&font->base, ctx, VG_OBJECT_FONT);
 140    font->glyphs = cso_hash_create();
 141
 142    vg_context_add_object(ctx, VG_OBJECT_FONT, font);
 143
 144    return font;
 145 }
 146
 147 void font_destroy(struct vg_font *font)
 148 {
 149    struct vg_context *ctx = vg_current_context();
 150    struct cso_hash_iter iter;
 151
 152    vg_context_remove_object(ctx, VG_OBJECT_FONT, font);
 153
 154    iter = cso_hash_first_node(font->glyphs);
 155    while (!cso_hash_iter_is_null(iter)) {
 156       struct vg_glyph *glyph = (struct vg_glyph *) cso_hash_iter_data(iter);
 157       FREE(glyph);
 158       iter = cso_hash_iter_next(iter);
 159    }
 160    cso_hash_delete(font->glyphs);
 161
 162    FREE(font);
 163 }
 164
 165 void font_set_glyph_to_path(struct vg_font *font,
 166                             VGuint glyphIndex,
 167                             struct path *path,
 168                             VGboolean isHinted,
 169                             const VGfloat glyphOrigin[2],
 170                             const VGfloat escapement[2])
 171 {
 172    add_glyph(font, glyphIndex, (struct vg_object *) path,
 173          isHinted, glyphOrigin, escapement);
 174 }
 175
 176 void font_set_glyph_to_image(struct vg_font *font,
 177                              VGuint glyphIndex,
 178                              struct vg_image *image,
 179                              const VGfloat glyphOrigin[2],
 180                              const VGfloat escapement[2])
 181 {
 182    add_glyph(font, glyphIndex, (struct vg_object *) image,
 183          VG_TRUE, glyphOrigin, escapement);
 184 }
 185
 186 void font_clear_glyph(struct vg_font *font,
 187                       VGuint glyphIndex)
 188 {
 189    if (!del_glyph(font, glyphIndex)) {
 190       struct vg_context *ctx = vg_current_context();
 191       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 192    }
 193 }
 194
 195 void font_draw_glyph(struct vg_font *font,
 196                      VGuint glyphIndex,
 197                      VGbitfield paintModes,
 198                      VGboolean allowAutoHinting)
 199 {
 200    struct vg_context *ctx = vg_current_context();
 201    struct vg_glyph *glyph;
 202
 203    glyph = get_glyph(font, glyphIndex);
 204    if (!glyph) {
 205       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 206       return;
 207    }
 208
 209    vg_render_glyph(ctx, glyph, paintModes, allowAutoHinting);
 210    vg_advance_glyph(ctx, glyph, 0.0f, 0.0f, VG_TRUE);
 211 }
 212
 213 void font_draw_glyphs(struct vg_font *font,
 214                       VGint glyphCount,
 215                       const VGuint *glyphIndices,
 216                       const VGfloat *adjustments_x,
 217                       const VGfloat *adjustments_y,
 218                       VGbitfield paintModes,
 219                       VGboolean allowAutoHinting)
 220 {
 221    struct vg_context *ctx = vg_current_context();
 222    VGint i;
 223
 224    for (i = 0; i < glyphCount; ++i) {
 225       if (!get_glyph(font, glyphIndices[i])) {
 226          vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 227          return;
 228       }
 229    }
 230
 231    for (i = 0; i < glyphCount; ++i) {
 232       struct vg_glyph *glyph;
 233       VGfloat adj_x, adj_y;
 234
 235       glyph = get_glyph(font, glyphIndices[i]);
 236
 237       vg_render_glyph(ctx, glyph, paintModes, allowAutoHinting);
 238
 239       adj_x = (adjustments_x) ? adjustments_x[i] : 0.0f;
 240       adj_y = (adjustments_y) ? adjustments_y[i] : 0.0f;
 241       vg_advance_glyph(ctx, glyph, adj_x, adj_y, (i == glyphCount - 1));
 242    }
 243 }
 244
 245 VGint font_num_glyphs(struct vg_font *font)
 246 {
 247    return cso_hash_size(font->glyphs);
 248 }
 249
 250 #endif /* OPENVG_VERSION_1_1 */