1 /*
2 * Copyright 2024 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7 #include "src/core/SkFontScanner.h"
8 #include "src/sfnt/SkOTUtils.h"
9
10 #include "src/ports/SkFontScanner_fontations.h"
11 #include "src/ports/SkTypeface_fontations_priv.h"
12 #include "src/ports/fontations/src/skpath_bridge.h"
13
14 using namespace skia_private;
15
16 namespace {
make_bridge_font_ref(sk_sp<SkData> fontData,uint32_t index)17 rust::Box<::fontations_ffi::BridgeFontRef> make_bridge_font_ref(sk_sp<SkData> fontData,
18 uint32_t index) {
19 rust::Slice<const uint8_t> slice{fontData->bytes(), fontData->size()};
20 return fontations_ffi::make_font_ref(slice, index);
21 }
22 }
23
SkFontScanner_Fontations()24 SkFontScanner_Fontations::SkFontScanner_Fontations() {
25 }
26
~SkFontScanner_Fontations()27 SkFontScanner_Fontations::~SkFontScanner_Fontations() {
28 }
29
scanFile(SkStreamAsset * stream,int * numFaces) const30 bool SkFontScanner_Fontations::scanFile(SkStreamAsset* stream, int* numFaces) const {
31 sk_sp<SkData> fontData = SkData::MakeFromStream(stream, stream->getLength());
32 stream->rewind();
33 rust::Slice<const uint8_t> slice{fontData->bytes(), fontData->size()};
34 ::std::uint32_t num_fonts;
35 if (!fontations_ffi::font_or_collection(slice, num_fonts)) {
36 return false;
37 }
38 *numFaces = num_fonts == 0 ? 1 : num_fonts;
39 return true;
40 }
41
scanFace(SkStreamAsset * stream,int faceIndex,int * numInstances) const42 bool SkFontScanner_Fontations::scanFace(SkStreamAsset* stream,
43 int faceIndex,
44 int* numInstances) const {
45 rust::Box<fontations_ffi::BridgeFontRef> fontRef =
46 make_bridge_font_ref(SkData::MakeFromStream(stream, stream->getLength()), faceIndex);
47 stream->rewind();
48 if (!fontations_ffi::font_ref_is_valid(*fontRef)) {
49 return false;
50 }
51
52 // TODO: For now assume only the default instance (not variation)
53 *numInstances = 1;
54 return true;
55 }
56
57 // TODO: For now assume only the default instance (not variation)
scanInstance(SkStreamAsset * stream,int faceIndex,int instanceIndex,SkString * name,SkFontStyle * style,bool * isFixedPitch,AxisDefinitions * axes) const58 bool SkFontScanner_Fontations::scanInstance(SkStreamAsset* stream,
59 int faceIndex,
60 int instanceIndex,
61 SkString* name,
62 SkFontStyle* style,
63 bool* isFixedPitch,
64 AxisDefinitions* axes) const {
65 SkASSERT(instanceIndex == 0);
66 rust::Box<fontations_ffi::BridgeFontRef> fontRef =
67 make_bridge_font_ref(SkData::MakeFromStream(stream, stream->getLength()), faceIndex);
68 if (!fontations_ffi::font_ref_is_valid(*fontRef)) {
69 return false;
70 }
71
72 if (name != nullptr) {
73 rust::String readFamilyName = fontations_ffi::family_name(*fontRef);
74 *name = SkString(readFamilyName.data(), readFamilyName.size());
75 }
76
77 if (style != nullptr) {
78 rust::Slice<const fontations_ffi::SkiaDesignCoordinate> coordinates;
79 rust::Box<fontations_ffi::BridgeNormalizedCoords> normalizedCoords =
80 resolve_into_normalized_coords(*fontRef, coordinates);
81 fontations_ffi::BridgeFontStyle fontStyle;
82 if (fontations_ffi::get_font_style(*fontRef, *normalizedCoords, fontStyle)) {
83 *style = SkFontStyle(fontStyle.weight, fontStyle.width, (SkFontStyle::Slant)fontStyle.slant);
84 } else {
85 *style = SkFontStyle::Normal();
86 }
87 }
88
89 return true;
90 }
91
92