Add standalone drawText for GrTextContext.
This unifies the interface between GrBitmapTextContext and
GrDistanceFieldTextContext so that they don't need special case code.
The future GrNVPRTextContext will also use this interface.
BUG=skia:2018
R=bsalomon@google.com, reed@google.com
Author: jvanverth@google.com
Review URL: https://codereview.chromium.org/141863005
git-svn-id: http://skia.googlecode.com/svn/trunk@13227 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrBitmapTextContext.cpp b/src/gpu/GrBitmapTextContext.cpp
index 6e33d90..da887a5 100755
--- a/src/gpu/GrBitmapTextContext.cpp
+++ b/src/gpu/GrBitmapTextContext.cpp
@@ -18,16 +18,21 @@
#include "SkStrokeRec.h"
#include "effects/GrCustomCoordsTextureEffect.h"
+#include "SkAutoKern.h"
+#include "SkGlyphCache.h"
+#include "SkGpuDevice.h"
+#include "SkGr.h"
+
static const int kGlyphCoordsAttributeIndex = 1;
SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
"Dump the contents of the font cache before every purge.");
-GrBitmapTextContext::GrBitmapTextContext(GrContext* context, const GrPaint& paint,
- const SkPaint& skPaint) :
- GrTextContext(context, paint, skPaint) {
- fAutoMatrix.setIdentity(fContext, &fPaint);
-
+GrBitmapTextContext::GrBitmapTextContext(GrContext* context,
+ const GrPaint& grPaint,
+ const SkPaint& skPaint,
+ const SkDeviceProperties& properties)
+ : GrTextContext(context, grPaint, skPaint, properties) {
fStrike = NULL;
fCurrTexture = NULL;
@@ -107,6 +112,330 @@
}
}
+void GrBitmapTextContext::drawText(const char text[], size_t byteLength,
+ SkScalar x, SkScalar y) {
+ SkASSERT(byteLength == 0 || text != NULL);
+
+ // nothing to draw
+ if (text == NULL || byteLength == 0 /*|| fRC->isEmpty()*/) {
+ return;
+ }
+
+ SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
+
+ SkAutoGlyphCache autoCache(fSkPaint, &fDeviceProperties, &fContext->getMatrix());
+ SkGlyphCache* cache = autoCache.getCache();
+ GrFontScaler* fontScaler = GetGrFontScaler(cache);
+
+ // transform our starting point
+ {
+ SkPoint loc;
+ fContext->getMatrix().mapXY(x, y, &loc);
+ x = loc.fX;
+ y = loc.fY;
+ }
+
+ // need to measure first
+ if (fSkPaint.getTextAlign() != SkPaint::kLeft_Align) {
+ SkVector stop;
+
+ MeasureText(cache, glyphCacheProc, text, byteLength, &stop);
+
+ SkScalar stopX = stop.fX;
+ SkScalar stopY = stop.fY;
+
+ if (fSkPaint.getTextAlign() == SkPaint::kCenter_Align) {
+ stopX = SkScalarHalf(stopX);
+ stopY = SkScalarHalf(stopY);
+ }
+ x -= stopX;
+ y -= stopY;
+ }
+
+ const char* stop = text + byteLength;
+
+ SkAutoKern autokern;
+
+ SkFixed fxMask = ~0;
+ SkFixed fyMask = ~0;
+ SkFixed halfSampleX, halfSampleY;
+ if (cache->isSubpixel()) {
+ halfSampleX = halfSampleY = (SK_FixedHalf >> SkGlyph::kSubBits);
+ SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(fContext->getMatrix());
+ if (kX_SkAxisAlignment == baseline) {
+ fyMask = 0;
+ halfSampleY = SK_FixedHalf;
+ } else if (kY_SkAxisAlignment == baseline) {
+ fxMask = 0;
+ halfSampleX = SK_FixedHalf;
+ }
+ } else {
+ halfSampleX = halfSampleY = SK_FixedHalf;
+ }
+
+ SkFixed fx = SkScalarToFixed(x) + halfSampleX;
+ SkFixed fy = SkScalarToFixed(y) + halfSampleY;
+
+ GrContext::AutoMatrix autoMatrix;
+ autoMatrix.setIdentity(fContext, &fPaint);
+
+ while (text < stop) {
+ const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);
+
+ fx += autokern.adjust(glyph);
+
+ if (glyph.fWidth) {
+ this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
+ glyph.getSubXFixed(),
+ glyph.getSubYFixed()),
+ SkFixedFloorToFixed(fx),
+ SkFixedFloorToFixed(fy),
+ fontScaler);
+ }
+
+ fx += glyph.fAdvanceX;
+ fy += glyph.fAdvanceY;
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Copied from SkDraw
+
+// last parameter is interpreted as SkFixed [x, y]
+// return the fixed position, which may be rounded or not by the caller
+// e.g. subpixel doesn't round
+typedef void (*AlignProc)(const SkPoint&, const SkGlyph&, SkIPoint*);
+
+static void leftAlignProc(const SkPoint& loc, const SkGlyph& glyph, SkIPoint* dst) {
+ dst->set(SkScalarToFixed(loc.fX), SkScalarToFixed(loc.fY));
+}
+
+static void centerAlignProc(const SkPoint& loc, const SkGlyph& glyph, SkIPoint* dst) {
+ dst->set(SkScalarToFixed(loc.fX) - (glyph.fAdvanceX >> 1),
+ SkScalarToFixed(loc.fY) - (glyph.fAdvanceY >> 1));
+}
+
+static void rightAlignProc(const SkPoint& loc, const SkGlyph& glyph, SkIPoint* dst) {
+ dst->set(SkScalarToFixed(loc.fX) - glyph.fAdvanceX,
+ SkScalarToFixed(loc.fY) - glyph.fAdvanceY);
+}
+
+static AlignProc pick_align_proc(SkPaint::Align align) {
+ static const AlignProc gProcs[] = {
+ leftAlignProc, centerAlignProc, rightAlignProc
+ };
+
+ SkASSERT((unsigned)align < SK_ARRAY_COUNT(gProcs));
+
+ return gProcs[align];
+}
+
+class BitmapTextMapState {
+public:
+ mutable SkPoint fLoc;
+
+ BitmapTextMapState(const SkMatrix& matrix, SkScalar y)
+ : fMatrix(matrix), fProc(matrix.getMapXYProc()), fY(y) {}
+
+ typedef void (*Proc)(const BitmapTextMapState&, const SkScalar pos[]);
+
+ Proc pickProc(int scalarsPerPosition);
+
+private:
+ const SkMatrix& fMatrix;
+ SkMatrix::MapXYProc fProc;
+ SkScalar fY; // ignored by MapXYProc
+ // these are only used by Only... procs
+ SkScalar fScaleX, fTransX, fTransformedY;
+
+ static void MapXProc(const BitmapTextMapState& state, const SkScalar pos[]) {
+ state.fProc(state.fMatrix, *pos, state.fY, &state.fLoc);
+ }
+
+ static void MapXYProc(const BitmapTextMapState& state, const SkScalar pos[]) {
+ state.fProc(state.fMatrix, pos[0], pos[1], &state.fLoc);
+ }
+
+ static void MapOnlyScaleXProc(const BitmapTextMapState& state,
+ const SkScalar pos[]) {
+ state.fLoc.set(SkScalarMul(state.fScaleX, *pos) + state.fTransX,
+ state.fTransformedY);
+ }
+
+ static void MapOnlyTransXProc(const BitmapTextMapState& state,
+ const SkScalar pos[]) {
+ state.fLoc.set(*pos + state.fTransX, state.fTransformedY);
+ }
+};
+
+BitmapTextMapState::Proc BitmapTextMapState::pickProc(int scalarsPerPosition) {
+ SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
+
+ if (1 == scalarsPerPosition) {
+ unsigned mtype = fMatrix.getType();
+ if (mtype & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
+ return MapXProc;
+ } else {
+ fScaleX = fMatrix.getScaleX();
+ fTransX = fMatrix.getTranslateX();
+ fTransformedY = SkScalarMul(fY, fMatrix.getScaleY()) +
+ fMatrix.getTranslateY();
+ return (mtype & SkMatrix::kScale_Mask) ?
+ MapOnlyScaleXProc : MapOnlyTransXProc;
+ }
+ } else {
+ return MapXYProc;
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void GrBitmapTextContext::drawPosText(const char text[], size_t byteLength,
+ const SkScalar pos[], SkScalar constY,
+ int scalarsPerPosition) {
+ SkASSERT(byteLength == 0 || text != NULL);
+ SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
+
+ // nothing to draw
+ if (text == NULL || byteLength == 0/* || fRC->isEmpty()*/) {
+ return;
+ }
+
+ SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
+
+ SkAutoGlyphCache autoCache(fSkPaint, &fDeviceProperties, &fContext->getMatrix());
+ SkGlyphCache* cache = autoCache.getCache();
+ GrFontScaler* fontScaler = GetGrFontScaler(cache);
+
+ // store original matrix before we reset, so we can use it to transform positions
+ SkMatrix ctm = fContext->getMatrix();
+ GrContext::AutoMatrix autoMatrix;
+ autoMatrix.setIdentity(fContext, &fPaint);
+
+ const char* stop = text + byteLength;
+ AlignProc alignProc = pick_align_proc(fSkPaint.getTextAlign());
+ BitmapTextMapState tms(ctm, constY);
+ BitmapTextMapState::Proc tmsProc = tms.pickProc(scalarsPerPosition);
+ SkFixed halfSampleX = 0, halfSampleY = 0;
+
+ if (cache->isSubpixel()) {
+ // maybe we should skip the rounding if linearText is set
+ SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(ctm);
+
+ SkFixed fxMask = ~0;
+ SkFixed fyMask = ~0;
+ if (kX_SkAxisAlignment == baseline) {
+ fyMask = 0;
+#ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
+ halfSampleY = SK_FixedHalf;
+#endif
+ } else if (kY_SkAxisAlignment == baseline) {
+ fxMask = 0;
+#ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
+ halfSampleX = SK_FixedHalf;
+#endif
+ }
+
+ if (SkPaint::kLeft_Align == fSkPaint.getTextAlign()) {
+ while (text < stop) {
+ tmsProc(tms, pos);
+ SkFixed fx = SkScalarToFixed(tms.fLoc.fX) + halfSampleX;
+ SkFixed fy = SkScalarToFixed(tms.fLoc.fY) + halfSampleY;
+
+ const SkGlyph& glyph = glyphCacheProc(cache, &text,
+ fx & fxMask, fy & fyMask);
+
+ if (glyph.fWidth) {
+ this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
+ glyph.getSubXFixed(),
+ glyph.getSubYFixed()),
+ SkFixedFloorToFixed(fx),
+ SkFixedFloorToFixed(fy),
+ fontScaler);
+ }
+ pos += scalarsPerPosition;
+ }
+ } else {
+ while (text < stop) {
+ const char* currentText = text;
+ const SkGlyph& metricGlyph = glyphCacheProc(cache, &text, 0, 0);
+
+ if (metricGlyph.fWidth) {
+ SkDEBUGCODE(SkFixed prevAdvX = metricGlyph.fAdvanceX;)
+ SkDEBUGCODE(SkFixed prevAdvY = metricGlyph.fAdvanceY;)
+
+ tmsProc(tms, pos);
+ SkIPoint fixedLoc;
+ alignProc(tms.fLoc, metricGlyph, &fixedLoc);
+
+ SkFixed fx = fixedLoc.fX + halfSampleX;
+ SkFixed fy = fixedLoc.fY + halfSampleY;
+
+ // have to call again, now that we've been "aligned"
+ const SkGlyph& glyph = glyphCacheProc(cache, ¤tText,
+ fx & fxMask, fy & fyMask);
+ // the assumption is that the metrics haven't changed
+ SkASSERT(prevAdvX == glyph.fAdvanceX);
+ SkASSERT(prevAdvY == glyph.fAdvanceY);
+ SkASSERT(glyph.fWidth);
+
+ this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
+ glyph.getSubXFixed(),
+ glyph.getSubYFixed()),
+ SkFixedFloorToFixed(fx),
+ SkFixedFloorToFixed(fy),
+ fontScaler);
+ }
+ pos += scalarsPerPosition;
+ }
+ }
+ } else { // not subpixel
+
+ 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) {
+ tmsProc(tms, pos);
+
+ SkFixed fx = SkScalarToFixed(tms.fLoc.fX) + SK_FixedHalf; //halfSampleX;
+ SkFixed fy = SkScalarToFixed(tms.fLoc.fY) + SK_FixedHalf; //halfSampleY;
+ this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
+ glyph.getSubXFixed(),
+ glyph.getSubYFixed()),
+ SkFixedFloorToFixed(fx),
+ SkFixedFloorToFixed(fy),
+ fontScaler);
+ }
+ pos += scalarsPerPosition;
+ }
+ } else {
+ while (text < stop) {
+ // the last 2 parameters are ignored
+ const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
+
+ if (glyph.fWidth) {
+ tmsProc(tms, pos);
+
+ SkIPoint fixedLoc;
+ alignProc(tms.fLoc, glyph, &fixedLoc);
+
+ SkFixed fx = fixedLoc.fX + SK_FixedHalf; //halfSampleX;
+ SkFixed fy = fixedLoc.fY + SK_FixedHalf; //halfSampleY;
+ this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
+ glyph.getSubXFixed(),
+ glyph.getSubYFixed()),
+ SkFixedFloorToFixed(fx),
+ SkFixedFloorToFixed(fy),
+ fontScaler);
+ }
+ pos += scalarsPerPosition;
+ }
+ }
+ }
+}
+
namespace {
// position + texture coord
@@ -123,6 +452,7 @@
if (NULL == fDrawTarget) {
return;
}
+
if (NULL == fStrike) {
#if SK_DISTANCEFIELD_FONTS
fStrike = fContext->getFontCache()->getStrike(scaler, false);