diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.18/src/hb-coretext.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-0.9.18/src/hb-coretext.cc | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.18/src/hb-coretext.cc b/Build/source/libs/harfbuzz/harfbuzz-0.9.18/src/hb-coretext.cc new file mode 100644 index 00000000000..8f94795928c --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-0.9.18/src/hb-coretext.cc @@ -0,0 +1,355 @@ +/* + * Copyright © 2012 Mozilla Foundation. + * Copyright © 2012 Google, Inc. + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + * + * Mozilla Author(s): Jonathan Kew + * Google Author(s): Behdad Esfahbod + */ + +#define HB_SHAPER coretext +#include "hb-shaper-impl-private.hh" + +#include "hb-coretext.h" + + +#ifndef HB_DEBUG_CORETEXT +#define HB_DEBUG_CORETEXT (HB_DEBUG+0) +#endif + + +HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face) +HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font) + + +/* + * shaper face data + */ + +struct hb_coretext_shaper_face_data_t { + CGFontRef cg_font; +}; + +static void +release_data (void *info, const void *data, size_t size) +{ + assert (hb_blob_get_length ((hb_blob_t *) info) == size && + hb_blob_get_data ((hb_blob_t *) info, NULL) == data); + + hb_blob_destroy ((hb_blob_t *) info); +} + +hb_coretext_shaper_face_data_t * +_hb_coretext_shaper_face_data_create (hb_face_t *face) +{ + hb_coretext_shaper_face_data_t *data = (hb_coretext_shaper_face_data_t *) calloc (1, sizeof (hb_coretext_shaper_face_data_t)); + if (unlikely (!data)) + return NULL; + + hb_blob_t *blob = hb_face_reference_blob (face); + unsigned int blob_length; + const char *blob_data = hb_blob_get_data (blob, &blob_length); + if (unlikely (!blob_length)) + DEBUG_MSG (CORETEXT, face, "Face has empty blob"); + + CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data); + data->cg_font = CGFontCreateWithDataProvider (provider); + CGDataProviderRelease (provider); + + if (unlikely (!data->cg_font)) { + DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed"); + free (data); + return NULL; + } + + return data; +} + +void +_hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data) +{ + CFRelease (data->cg_font); + free (data); +} + +CGFontRef +hb_coretext_face_get_cg_font (hb_face_t *face) +{ + if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL; + hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); + return face_data->cg_font; +} + + +/* + * shaper font data + */ + +struct hb_coretext_shaper_font_data_t { + CTFontRef ct_font; +}; + +hb_coretext_shaper_font_data_t * +_hb_coretext_shaper_font_data_create (hb_font_t *font) +{ + if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL; + + hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t)); + if (unlikely (!data)) + return NULL; + + hb_face_t *face = font->face; + hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); + + data->ct_font = CTFontCreateWithGraphicsFont (face_data->cg_font, font->y_scale, NULL, NULL); + if (unlikely (!data->ct_font)) { + DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed"); + free (data); + return NULL; + } + + return data; +} + +void +_hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data) +{ + CFRelease (data->ct_font); + free (data); +} + + +/* + * shaper shape_plan data + */ + +struct hb_coretext_shaper_shape_plan_data_t {}; + +hb_coretext_shaper_shape_plan_data_t * +_hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, + const hb_feature_t *user_features HB_UNUSED, + unsigned int num_user_features HB_UNUSED) +{ + return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; +} + +void +_hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED) +{ +} + +CTFontRef +hb_coretext_font_get_ct_font (hb_font_t *font) +{ + if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return NULL; + hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); + return font_data->ct_font; +} + + +/* + * shaper + */ + +hb_bool_t +_hb_coretext_shape (hb_shape_plan_t *shape_plan, + hb_font_t *font, + hb_buffer_t *buffer, + const hb_feature_t *features, + unsigned int num_features) +{ + hb_face_t *face = font->face; + hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); + hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); + +#define FAIL(...) \ + HB_STMT_START { \ + DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \ + return false; \ + } HB_STMT_END; + + unsigned int scratch_size; + char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size); + +#define utf16_index() var1.u32 + + UniChar *pchars = (UniChar *) scratch; + unsigned int chars_len = 0; + for (unsigned int i = 0; i < buffer->len; i++) { + hb_codepoint_t c = buffer->info[i].codepoint; + buffer->info[i].utf16_index() = chars_len; + if (likely (c < 0x10000)) + pchars[chars_len++] = c; + else if (unlikely (c >= 0x110000)) + pchars[chars_len++] = 0xFFFD; + else { + pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10); + pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1)); + } + } + +#undef utf16_index + + CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (kCFAllocatorDefault, + pchars, chars_len, + kCFAllocatorNull); + + CFDictionaryRef attrs = CFDictionaryCreate (kCFAllocatorDefault, + (const void**) &kCTFontAttributeName, + (const void**) &font_data->ct_font, + 1, /* count of attributes */ + &kCFTypeDictionaryKeyCallBacks, + &kCFTypeDictionaryValueCallBacks); + + /* TODO: support features */ + + CFAttributedStringRef attr_string = CFAttributedStringCreate (kCFAllocatorDefault, string_ref, attrs); + CFRelease (string_ref); + CFRelease (attrs); + + CTLineRef line = CTLineCreateWithAttributedString (attr_string); + CFRelease (attr_string); + + CFArrayRef glyph_runs = CTLineGetGlyphRuns (line); + unsigned int num_runs = CFArrayGetCount (glyph_runs); + + bool success = true; + buffer->len = 0; + + const CFRange range_all = CFRangeMake (0, 0); + + for (unsigned int i = 0; i < num_runs; i++) { + CTRunRef run = (CTRunRef) CFArrayGetValueAtIndex (glyph_runs, i); + + unsigned int num_glyphs = CTRunGetGlyphCount (run); + if (num_glyphs == 0) + continue; + + buffer->ensure (buffer->len + num_glyphs); + + /* Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds, + * and so copying data to our own buffer with CTRunGetGlyphs will be + * extremely rare. */ + + unsigned int scratch_size; + char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size); + +#define ALLOCATE_ARRAY(Type, name, len) \ + Type *name = (Type *) scratch; \ + scratch += (len) * sizeof ((name)[0]); \ + scratch_size -= (len) * sizeof ((name)[0]); + + const CGGlyph* glyphs = CTRunGetGlyphsPtr (run); + if (!glyphs) { + ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs); + CTRunGetGlyphs (run, range_all, glyph_buf); + glyphs = glyph_buf; + } + + const CGPoint* positions = CTRunGetPositionsPtr (run); + if (!positions) { + ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs); + CTRunGetPositions (run, range_all, position_buf); + positions = position_buf; + } + + const CFIndex* string_indices = CTRunGetStringIndicesPtr (run); + if (!string_indices) { + ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs); + CTRunGetStringIndices (run, range_all, index_buf); + string_indices = index_buf; + } + +#undef ALLOCATE_ARRAY + + double run_width = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL); + + for (unsigned int j = 0; j < num_glyphs; j++) { + double advance = (j + 1 < num_glyphs ? positions[j + 1].x : positions[0].x + run_width) - positions[j].x; + + hb_glyph_info_t *info = &buffer->info[buffer->len]; + hb_glyph_position_t *pos = &buffer->pos[buffer->len]; + + info->codepoint = glyphs[j]; + info->cluster = string_indices[j]; + + /* Currently, we do all x-positioning by setting the advance, we never use x-offset. */ + info->mask = advance; + info->var1.u32 = 0; + info->var2.u32 = positions[j].y; + + buffer->len++; + } + } + + buffer->clear_positions (); + + unsigned int count = buffer->len; + for (unsigned int i = 0; i < count; ++i) { + hb_glyph_info_t *info = &buffer->info[i]; + hb_glyph_position_t *pos = &buffer->pos[i]; + + /* TODO vertical */ + pos->x_advance = info->mask; + pos->x_offset = info->var1.u32; + pos->y_offset = info->var2.u32; + } + + /* Fix up clusters so that we never return out-of-order indices; + * if core text has reordered glyphs, we'll merge them to the + * beginning of the reordered cluster. + * + * This does *not* mean we'll form the same clusters as Uniscribe + * or the native OT backend, only that the cluster indices will be + * monotonic in the output buffer. */ + if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) { + unsigned int prev_cluster = 0; + for (unsigned int i = 0; i < count; i++) { + unsigned int curr_cluster = buffer->info[i].cluster; + if (curr_cluster < prev_cluster) { + for (unsigned int j = i; j > 0; j--) { + if (buffer->info[j - 1].cluster > curr_cluster) + buffer->info[j - 1].cluster = curr_cluster; + else + break; + } + } + prev_cluster = curr_cluster; + } + } else { + unsigned int prev_cluster = (unsigned int)-1; + for (unsigned int i = 0; i < count; i++) { + unsigned int curr_cluster = buffer->info[i].cluster; + if (curr_cluster > prev_cluster) { + for (unsigned int j = i; j > 0; j--) { + if (buffer->info[j - 1].cluster < curr_cluster) + buffer->info[j - 1].cluster = curr_cluster; + else + break; + } + } + prev_cluster = curr_cluster; + } + } + + return true; +} |