Create GrTextUtils

src/gpu/GrTextUtils.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrTextUtils.h"
+
+#include "GrBlurUtils.h"
+#include "GrContext.h"
+#include "GrDrawContext.h"
+#include "SkDrawProcs.h"
+#include "SkGlyphCache.h"
+#include "SkPaint.h"
+#include "SkRect.h"
+#include "SkTextMapStateProc.h"
+#include "SkTextToPathIter.h"
+
+void GrTextUtils::DrawTextAsPath(GrContext* context, GrDrawContext* dc,
+                                 const GrClip& clip,
+                                 const SkPaint& skPaint, const SkMatrix& viewMatrix,
+                                 const char text[], size_t byteLength, SkScalar x, SkScalar y,
+                                 const SkIRect& clipBounds) {
+    SkTextToPathIter iter(text, byteLength, skPaint, true);
+
+    SkMatrix    matrix;
+    matrix.setScale(iter.getPathScale(), iter.getPathScale());
+    matrix.postTranslate(x, y);
+
+    const SkPath* iterPath;
+    SkScalar xpos, prevXPos = 0;
+
+    while (iter.next(&iterPath, &xpos)) {
+        matrix.postTranslate(xpos - prevXPos, 0);
+        if (iterPath) {
+            const SkPaint& pnt = iter.getPaint();
+            GrBlurUtils::drawPathWithMaskFilter(context, dc, clip, *iterPath,
+                                                pnt, viewMatrix, &matrix, clipBounds, false);
+        }
+        prevXPos = xpos;
+    }
+}
+
+void GrTextUtils::DrawPosTextAsPath(GrContext* context,
+                                    GrDrawContext* dc,
+                                    const SkSurfaceProps& props,
+                                    const GrClip& clip,
+                                    const SkPaint& origPaint, const SkMatrix& viewMatrix,
+                                    const char text[], size_t byteLength,
+                                    const SkScalar pos[], int scalarsPerPosition,
+                                    const SkPoint& offset, const SkIRect& clipBounds) {
+    // setup our std paint, in hopes of getting hits in the cache
+    SkPaint paint(origPaint);
+    SkScalar matrixScale = paint.setupForAsPaths();
+
+    SkMatrix matrix;
+    matrix.setScale(matrixScale, matrixScale);
+
+    // Temporarily jam in kFill, so we only ever ask for the raw outline from the cache.
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setPathEffect(nullptr);
+
+    SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
+    SkAutoGlyphCache    autoCache(paint, &props, nullptr);
+    SkGlyphCache*       cache = autoCache.getCache();
+
+    const char*        stop = text + byteLength;
+    SkTextAlignProc    alignProc(paint.getTextAlign());
+    SkTextMapStateProc tmsProc(SkMatrix::I(), offset, scalarsPerPosition);
+
+    // Now restore the original settings, so we "draw" with whatever style/stroking.
+    paint.setStyle(origPaint.getStyle());
+    paint.setPathEffect(origPaint.getPathEffect());
+
+    while (text < stop) {
+        const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
+        if (glyph.fWidth) {
+            const SkPath* path = cache->findPath(glyph);
+            if (path) {
+                SkPoint tmsLoc;
+                tmsProc(pos, &tmsLoc);
+                SkPoint loc;
+                alignProc(tmsLoc, glyph, &loc);
+
+                matrix[SkMatrix::kMTransX] = loc.fX;
+                matrix[SkMatrix::kMTransY] = loc.fY;
+                GrBlurUtils::drawPathWithMaskFilter(context, dc, clip, *path, paint,
+                                                    viewMatrix, &matrix, clipBounds, false);
+            }
+        }
+        pos += scalarsPerPosition;
+    }
+}