Add standalone drawText for GrTextContext.

src/gpu/GrDistanceFieldTextContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDistanceFieldTextContext.h"
 #include "GrAtlas.h"
 #include "GrDrawTarget.h"
 #include "GrFontScaler.h"
 #include "SkGlyphCache.h"
 #include "GrIndexBuffer.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
+#include "SkGpuDevice.h"
 #include "SkPath.h"
 #include "SkRTConf.h"
 #include "SkStrokeRec.h"
 #include "effects/GrDistanceFieldTextureEffect.h"
 
 static const int kGlyphCoordsAttributeIndex = 1;
 
 static const int kBaseDFFontSize = 32;
 
 SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
                 "Dump the contents of the font cache before every purge.");
 
-GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context,
+GrDistanceFieldTextContext::GrDistanceFieldTextContext(SkGpuDevice* device,
                                                        const GrPaint& grPaint,
                                                        const SkPaint& skPaint)
-                                                     : GrTextContext(context, grPaint, skPaint) {
+                                                     : GrTextContext(device, grPaint, skPaint) {
     fStrike = NULL;
 
     fCurrTexture = NULL;
     fCurrVertex = 0;
 
     fVertices = NULL;
     fMaxVertices = 0;
 
     fTextRatio = fSkPaint.getTextSize()/kBaseDFFontSize;
 
@@ skipping 12 matching lines @@
     unsigned g = SkColorGetG(c);
     unsigned b = SkColorGetB(c);
     return GrColorPackRGBA(r, g, b, 0xff);
 }
 
 void GrDistanceFieldTextContext::flushGlyphs() {
     if (NULL == fDrawTarget) {
         return;
     }
 
+    GrContext* context = fDevice->context();
     GrDrawState* drawState = fDrawTarget->drawState();
     GrDrawState::AutoRestoreEffects are(drawState);
-    drawState->setFromPaint(fPaint, fContext->getMatrix(), fContext->getRenderTarget());
+    drawState->setFromPaint(fPaint, context->getMatrix(), context->getRenderTarget());
 
     if (fCurrVertex > 0) {
         // setup our sampler state for our text texture/atlas
         SkASSERT(GrIsALIGN4(fCurrVertex));
         SkASSERT(fCurrTexture);
         GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kBilerp_FilterMode);
 
         // This effect could be stored with one of the cache objects (atlas?)
         drawState->addCoverageEffect(
                                 GrDistanceFieldTextureEffect::Create(fCurrTexture, params),
@@ skipping 15 matching lines @@
             // paintColor
             drawState->setBlendConstant(skcolor_to_grcolor_nopremultiply(fSkPaint.getColor()));
             drawState->setBlendFunc(kConstC_GrBlendCoeff, kISC_GrBlendCoeff);
         } else {
             // set back to normal in case we took LCD path previously.
             drawState->setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff());
             drawState->setColor(fPaint.getColor());
         }
 
         int nGlyphs = fCurrVertex / 4;
-        fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
+        fDrawTarget->setIndexSourceToBuffer(context->getQuadIndexBuffer());
         fDrawTarget->drawIndexedInstances(kTriangles_GrPrimitiveType,
                                           nGlyphs,
                                           4, 6);
         fDrawTarget->resetVertexSource();
         fVertices = NULL;
         fMaxVertices = 0;
         fCurrVertex = 0;
         SkSafeSetNull(fCurrTexture);
     }
 }
 
 namespace {
 
 // position + texture coord
 extern const GrVertexAttrib gTextVertexAttribs[] = {
     {kVec2f_GrVertexAttribType, 0,               kPosition_GrVertexAttribBinding},
     {kVec2f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}
 };
 
 };
 
 void GrDistanceFieldTextContext::drawPackedGlyph(GrGlyph::PackedID packed,
                                                  GrFixed vx, GrFixed vy,
                                                  GrFontScaler* scaler) {
     if (NULL == fDrawTarget) {
         return;
     }
+    GrContext* context = fDevice->context();
     if (NULL == fStrike) {
-        fStrike = fContext->getFontCache()->getStrike(scaler, true);
+        fStrike = context->getFontCache()->getStrike(scaler, true);
     }
 
     GrGlyph* glyph = fStrike->getGlyph(packed, scaler);
     if (NULL == glyph || glyph->fBounds.isEmpty()) {
         return;
     }
 
     SkScalar sx = SkFixedToScalar(vx);
     SkScalar sy = SkFixedToScalar(vy);
 /*
@@ skipping 14 matching lines @@
             return;
         }
     }
 */
     if (NULL == glyph->fPlot) {
         if (fStrike->getGlyphAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
 
         // try to clear out an unused plot before we flush
-        fContext->getFontCache()->freePlotExceptFor(fStrike);
+        context->getFontCache()->freePlotExceptFor(fStrike);
         if (fStrike->getGlyphAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
 
         if (c_DumpFontCache) {
 #ifdef SK_DEVELOPER
-            fContext->getFontCache()->dump();
+            context->getFontCache()->dump();
 #endif
         }
 
         // before we purge the cache, we must flush any accumulated draws
         this->flushGlyphs();
-        fContext->flush();
+        context->flush();
 
         // try to purge
-        fContext->getFontCache()->purgeExceptFor(fStrike);
+        context->getFontCache()->purgeExceptFor(fStrike);
         // need to use new flush count here
         if (fStrike->getGlyphAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
 
         if (NULL == glyph->fPath) {
             SkPath* path = SkNEW(SkPath);
             if (!scaler->getGlyphPath(glyph->glyphID(), path)) {
                 // flag the glyph as being dead?
                 delete path;
                 return;
             }
             glyph->fPath = path;
         }
 
         GrContext::AutoMatrix am;
         SkMatrix translate;
         translate.setTranslate(sx, sy);
         GrPaint tmpPaint(fPaint);
-        am.setPreConcat(fContext, translate, &tmpPaint);
+        am.setPreConcat(context, translate, &tmpPaint);
         SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
-        fContext->drawPath(tmpPaint, *glyph->fPath, stroke);
+        context->drawPath(tmpPaint, *glyph->fPath, stroke);
         return;
     }
 
 HAS_ATLAS:
     SkASSERT(glyph->fPlot);
     GrDrawTarget::DrawToken drawToken = fDrawTarget->getCurrentDrawToken();
     glyph->fPlot->setDrawToken(drawToken);
 
     GrTexture* texture = glyph->fPlot->texture();
     SkASSERT(texture);
 
     if (fCurrTexture != texture || fCurrVertex + 4 > fMaxVertices) {
         this->flushGlyphs();
         fCurrTexture = texture;
         fCurrTexture->ref();
     }
 
     if (NULL == fVertices) {
        // If we need to reserve vertices allow the draw target to suggest
         // a number of verts to reserve and whether to perform a flush.
         fMaxVertices = kMinRequestedVerts;
         fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(
             SK_ARRAY_COUNT(gTextVertexAttribs));
         bool flush = fDrawTarget->geometryHints(&fMaxVertices, NULL);
         if (flush) {
             this->flushGlyphs();
-            fContext->flush();
+            context->flush();
             fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(
                 SK_ARRAY_COUNT(gTextVertexAttribs));
         }
         fMaxVertices = kDefaultRequestedVerts;
         // ignore return, no point in flushing again.
         fDrawTarget->geometryHints(&fMaxVertices, NULL);
 
-        int maxQuadVertices = 4 * fContext->getQuadIndexBuffer()->maxQuads();
+        int maxQuadVertices = 4 * context->getQuadIndexBuffer()->maxQuads();
         if (fMaxVertices < kMinRequestedVerts) {
             fMaxVertices = kDefaultRequestedVerts;
         } else if (fMaxVertices > maxQuadVertices) {
             // don't exceed the limit of the index buffer
             fMaxVertices = maxQuadVertices;
         }
         bool success = fDrawTarget->reserveVertexAndIndexSpace(fMaxVertices,
                                                                0,
                                                                GrTCast<void**>(&fVertices),
                                                                NULL);
@@ skipping 26 matching lines @@
                                         2 * sizeof(SkPoint));
     fVertices[2*fCurrVertex+1].setRectFan(SkFixedToFloat(texture->normalizeFixedX(tx)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty)),
                                           SkFixedToFloat(texture->normalizeFixedX(tx + tw)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty + th)),
                                           2 * sizeof(SkPoint));
     fCurrVertex += 4;
 }
 
 void GrDistanceFieldTextContext::drawText(const char text[], size_t byteLength,
-                                          SkScalar x, SkScalar y, SkGlyphCache* cache,
-                                          GrFontScaler* fontScaler) {
+                                          SkScalar x, SkScalar y) {
     SkASSERT(byteLength == 0 || text != NULL);
 
-    // nothing to draw
-    if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/) {
+    // nothing to draw or can't draw
+    if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/
+        || fSkPaint.getRasterizer()) {
         return;
     }
-
+    
     SkScalar sizeRatio = fTextRatio;
 
     SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
 
+    SkAutoGlyphCache    autoCache(fSkPaint, &fDevice->getDeviceProperties(), NULL);
+    SkGlyphCache*       cache = autoCache.getCache();
+    GrFontScaler*       fontScaler = GetGrFontScaler(cache);
+    
     // need to measure first
     // TODO - generate positions and pre-load cache as well?
     const char* stop = text + byteLength;
     if (fSkPaint.getTextAlign() != SkPaint::kLeft_Align) {
         SkFixed    stopX = 0;
         SkFixed    stopY = 0;
 
         const char* textPtr = text;
         while (textPtr < stop) {
             // don't need x, y here, since all subpixel variants will have the
@@ skipping 32 matching lines @@
                                   fontScaler);
         }
 
         fx += SkFixedMul_portable(glyph.fAdvanceX, fixedScale);
         fy += SkFixedMul_portable(glyph.fAdvanceY, fixedScale);
     }
 }
 
 void GrDistanceFieldTextContext::drawPosText(const char text[], size_t byteLength,
                                              const SkScalar pos[], SkScalar constY,
-                                             int scalarsPerPosition,
-                                             SkGlyphCache* cache, GrFontScaler* fontScaler) {
+                                             int scalarsPerPosition) {
 
     SkASSERT(byteLength == 0 || text != NULL);
     SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
 
     // nothing to draw
-    if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/) {
+    if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/
+        || fSkPaint.getRasterizer()) {
         return;
     }
 
     SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
 
+    SkAutoGlyphCache    autoCache(fSkPaint, &fDevice->getDeviceProperties(), NULL);
+    SkGlyphCache*       cache = autoCache.getCache();
+    GrFontScaler*       fontScaler = GetGrFontScaler(cache);
+    
     const char*        stop = text + byteLength;
 
     if (SkPaint::kLeft_Align == fSkPaint.getTextAlign()) {
         while (text < stop) {
             // the last 2 parameters are ignored
             const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
 
             if (glyph.fWidth) {
                 SkScalar x = pos[0];
                 SkScalar y = scalarsPerPosition == 1 ? constY : pos[1];
@@ skipping 23 matching lines @@
                                       SkScalarToFixed(x) - (glyph.fAdvanceX >> alignShift)
                                         + SK_FixedHalf, //d1g.fHalfSampleX,
                                       SkScalarToFixed(y) - (glyph.fAdvanceY >> alignShift)
                                         + SK_FixedHalf, //d1g.fHalfSampleY,
                                       fontScaler);
             }
             pos += scalarsPerPosition;
         }
     }
 }