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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkRecordDraw.h" | 8 #include "SkRecordDraw.h" |
9 | 9 |
10 namespace { | 10 namespace { |
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69 #define CAN_SKIP(T) template <> bool Draw::canSkip(const SkRecords::T& r) const
\ | 69 #define CAN_SKIP(T) template <> bool Draw::canSkip(const SkRecords::T& r) const
\ |
70 { return fClipEmpty && SkRegion::kIntersect_Op == r.op; } | 70 { return fClipEmpty && SkRegion::kIntersect_Op == r.op; } |
71 CAN_SKIP(ClipPath); | 71 CAN_SKIP(ClipPath); |
72 CAN_SKIP(ClipRRect); | 72 CAN_SKIP(ClipRRect); |
73 CAN_SKIP(ClipRect); | 73 CAN_SKIP(ClipRect); |
74 CAN_SKIP(ClipRegion); | 74 CAN_SKIP(ClipRegion); |
75 #undef CAN_SKIP | 75 #undef CAN_SKIP |
76 | 76 |
77 static bool can_skip_text(const SkCanvas& c, const SkPaint& p, SkScalar minY, Sk
Scalar maxY) { | 77 static bool can_skip_text(const SkCanvas& c, const SkPaint& p, SkScalar minY, Sk
Scalar maxY) { |
78 // If we're drawing vertical text, none of the checks we're about to do make
any sense. | 78 // If we're drawing vertical text, none of the checks we're about to do make
any sense. |
79 // We use canComputeFastBounds as a proxy for "is this text going to be rect
angular?". | 79 // We'll need to call SkPaint::computeFastBounds() later, so bail out if tha
t's not possible. |
80 if (p.isVerticalText() || !p.canComputeFastBounds()) { | 80 if (p.isVerticalText() || !p.canComputeFastBounds()) { |
81 return false; | 81 return false; |
82 } | 82 } |
83 | 83 |
84 // Rather than checking the top and bottom font metrics, we guess. Actually
looking up the top | 84 // Rather than checking the top and bottom font metrics, we guess. Actually
looking up the top |
85 // and bottom metrics is slow, and this overapproximation should be good eno
ugh. | 85 // and bottom metrics is slow, and this overapproximation should be good eno
ugh. |
86 const SkScalar buffer = p.getTextSize() * 1.5f; | 86 const SkScalar buffer = p.getTextSize() * 1.5f; |
87 SkDEBUGCODE(SkPaint::FontMetrics metrics;) | 87 SkDEBUGCODE(SkPaint::FontMetrics metrics;) |
88 SkDEBUGCODE(p.getFontMetrics(&metrics);) | 88 SkDEBUGCODE(p.getFontMetrics(&metrics);) |
89 SkASSERT(-buffer <= metrics.fTop); | 89 SkASSERT(-buffer <= metrics.fTop); |
90 SkASSERT(+buffer >= metrics.fBottom); | 90 SkASSERT(+buffer >= metrics.fBottom); |
91 return c.quickRejectY(minY - buffer, maxY + buffer); | 91 |
| 92 // Let the paint adjust the text bounds. We don't care about left and right
here, so we use |
| 93 // 0 and 1 respectively just so the bounds rectangle isn't empty. |
| 94 SkRect bounds; |
| 95 bounds.set(0, -buffer, SK_Scalar1, buffer); |
| 96 SkRect adjusted = p.computeFastBounds(bounds, &bounds); |
| 97 return c.quickRejectY(minY + adjusted.fTop, maxY + adjusted.fBottom); |
92 } | 98 } |
93 | 99 |
94 template <> bool Draw::canSkip(const SkRecords::DrawPosTextH& r) const { | 100 template <> bool Draw::canSkip(const SkRecords::DrawPosTextH& r) const { |
95 return fClipEmpty || can_skip_text(*fCanvas, r.paint, r.y, r.y); | 101 return fClipEmpty || can_skip_text(*fCanvas, r.paint, r.y, r.y); |
96 } | 102 } |
97 | 103 |
98 template <> bool Draw::canSkip(const SkRecords::DrawPosText& r) const { | 104 template <> bool Draw::canSkip(const SkRecords::DrawPosText& r) const { |
99 if (fClipEmpty) { | 105 if (fClipEmpty) { |
100 return true; | 106 return true; |
101 } | 107 } |
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157 } | 163 } |
158 } | 164 } |
159 | 165 |
160 } // namespace | 166 } // namespace |
161 | 167 |
162 void SkRecordDraw(const SkRecord& record, SkCanvas* canvas) { | 168 void SkRecordDraw(const SkRecord& record, SkCanvas* canvas) { |
163 for (Draw draw(canvas); draw.index() < record.count(); draw.next()) { | 169 for (Draw draw(canvas); draw.index() < record.count(); draw.next()) { |
164 record.visit(draw.index(), draw); | 170 record.visit(draw.index(), draw); |
165 } | 171 } |
166 } | 172 } |
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