SkTextBlob

src/core/SkTextBlob.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTextBlob.h"
+
+#include "SkDevice.h"
+
+const SkTextChunk* SkTextChunk::Create(const uint16_t* glyphs, size_t count, const SkPaint& paint,
+                                 const SkRect* bounds) {
+    if (NULL == glyphs || 0 == count) {
+        return NULL;
+    }
+
+    return SkNEW_ARGS(SkTextChunk, (glyphs, count, NULL, 0, paint, bounds));
+}
+
+const SkTextChunk* SkTextChunk::Create(const uint16_t* glyphs, size_t count, const SkScalar* pos,
+                                 const SkPaint& paint, const SkRect* bounds) {
+    if (NULL == glyphs || NULL == pos || 0 == count) {
+        return NULL;
+    }
+
+    return SkNEW_ARGS(SkTextChunk, (glyphs, count, pos, 1, paint, bounds));
+}
+
+const SkTextChunk* SkTextChunk::Create(const uint16_t* glyphs, size_t count, const SkPoint* pos,
+                                 const SkPaint& paint, const SkRect* bounds) {
+    if (NULL == glyphs || NULL == pos || 0 == count) {
+        return NULL;
+    }
+
+    SK_COMPILE_ASSERT(sizeof(SkScalar) * 2 == sizeof(SkPoint), point_is_two_scalars);
+    return SkNEW_ARGS(SkTextChunk,
+                      (glyphs, count, reinterpret_cast<const SkScalar*>(pos), 2, paint, bounds));
+}
+
+SkTextChunk::SkTextChunk(const uint16_t* glyphs, size_t count, const SkScalar* pos,
+                         unsigned scalarsPerPos, const SkPaint& paint, const SkRect* bounds)
+    : fGlyphCount(count)
+    , fPos(NULL)
+    , fFont(paint)
+    , fScalarsPerPos(scalarsPerPos) {
+
+    SkASSERT(glyphs);
+    SkASSERT(count > 0);
+    size_t glyphStorageSize = sizeof(uint16_t) * count;
+    fGlyphs = reinterpret_cast<uint16_t*>(sk_malloc_throw(glyphStorageSize));
+    memcpy(fGlyphs, glyphs, glyphStorageSize);
+
+    SkASSERT(scalarsPerPos <= 2);
+    SkASSERT((NULL != pos) == (scalarsPerPos > 0));
+    if (NULL != pos) {
+        size_t posStorageSize = sizeof(SkScalar) * fScalarsPerPos * count;
+        fPos = reinterpret_cast<SkScalar*>(sk_malloc_throw(posStorageSize));
+        memcpy(fPos, pos, posStorageSize);
+    }
+
+    fBoundsDirty = (NULL == bounds);
+    if (!fBoundsDirty) {
+        fBounds = *bounds;
+    }
+
+    SkASSERT(SkPaint::kGlyphID_TextEncoding == paint.getTextEncoding());
+}
+
+SkTextChunk::~SkTextChunk() {
+    sk_free(fGlyphs);
+    sk_free(fPos);
+}
+
+const SkRect& SkTextChunk::bounds() const {
+    if (fBoundsDirty) {
+        fFont.measureText(fGlyphs, fGlyphCount, &fBounds);
+        fBoundsDirty = false;
+    }
+
+    return fBounds;
+}
+
+void SkTextChunk::draw(SkBaseDevice* device, const SkDraw& draw, const SkPaint& paint) const {
+    SkASSERT(NULL != device);
+    SkASSERT(SkPaint::kGlyphID_TextEncoding == paint.getTextEncoding());
+
+    size_t length = sizeof(uint16_t) * fGlyphCount;
+    if (NULL != fPos) {
+        SkASSERT(1 == fScalarsPerPos || 2 == fScalarsPerPos);
+        device->drawPosText(draw, fGlyphs, length, fPos, 0, fScalarsPerPos, paint);
+    } else {
+        SkASSERT(0 == fScalarsPerPos);
+        device->drawText(draw, fGlyphs, length, 0, 0, paint);
+    }
+}
+
+const SkTextBlob* SkTextBlob::Create(const SkTextChunk *chunk) {
+    SkTDArray<const SkTextChunk*> chunks;
+    chunks.setReserve(1);
+    *chunks.append() = chunk;
+    return SkNEW_ARGS(SkTextBlob, (chunks));
+}
+
+const SkTextBlob* SkTextBlob::Create(const SkTDArray<const SkTextChunk*>& chunks) {
+    return SkNEW_ARGS(SkTextBlob, (chunks));
+}
+
+SkTextBlob::SkTextBlob(const SkTDArray<const SkTextChunk*>& chunks)
+    : fChunks(chunks)
+    , fUniqueID(SK_InvalidGenID) {
+}
+
+SkTextBlob::~SkTextBlob() {
+    Iter it(this);
+    while (const SkTextChunk* chunk = it.next()) {
+        SkDELETE(chunk);
+    }
+}
+
+uint32_t SkTextBlob::uniqueID() const {
+    static int32_t  gTextBlobGenerationID; // = 0;
+
+    // do a loop in case our global wraps around, as we never want to
+    // return SK_InvalidGenID
+    while (SK_InvalidGenID == fUniqueID) {
+        fUniqueID = sk_atomic_inc(&gTextBlobGenerationID) + 1;
+    }
+
+    return fUniqueID;
+}
+
+SkTextBlobBuilder::SkTextBlobBuilder() {
+}
+
+SkTextBlobBuilder::~SkTextBlobBuilder() {
+    // unused chunks.
+    for (int i = 0; i < fChunks.count(); ++i) {
+        SkDELETE(fChunks[i]);
+    }
+}
+
+const SkTextBlob* SkTextBlobBuilder::build() {
+    const SkTextBlob* blob = SkTextBlob::Create(fChunks);
+    fChunks.rewind();
+    return blob;
+}
+
+void SkTextBlobBuilder::addChunk(const SkTextChunk* chunk) {
+    *fChunks.append() = chunk;
+}
+
+