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/*
* 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 "GrBitmapTextContext.h"
#include "GrAtlas.h"
#include "GrDefaultGeoProcFactory.h"
#include "GrDrawTarget.h"
#include "GrFontCache.h"
#include "GrFontScaler.h"
#include "GrIndexBuffer.h"
#include "GrStrokeInfo.h"
#include "GrTexturePriv.h"
#include "SkAutoKern.h"
#include "SkColorPriv.h"
#include "SkDraw.h"
#include "SkDrawProcs.h"
#include "SkGlyphCache.h"
#include "SkGpuDevice.h"
#include "SkGr.h"
#include "SkPath.h"
#include "SkRTConf.h"
#include "SkStrokeRec.h"
#include "SkTextMapStateProc.h"
#include "effects/GrBitmapTextGeoProc.h"
#include "effects/GrSimpleTextureEffect.h"
SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
"Dump the contents of the font cache before every purge.");
namespace {
static const size_t kLCDTextVASize = 2 * sizeof(SkPoint);
// position + local coord
static const size_t kColorTextVASize = 2 * sizeof(SkPoint);
static const size_t kGrayTextVASize = 2 * sizeof(SkPoint) + sizeof(GrColor);
static const int kVerticesPerGlyph = 4;
static const int kIndicesPerGlyph = 6;
};
GrBitmapTextContext::GrBitmapTextContext(GrContext* context,
const SkDeviceProperties& properties)
: GrTextContext(context, properties) {
fStrike = NULL;
fCurrTexture = NULL;
fEffectTextureUniqueID = SK_InvalidUniqueID;
fVertices = NULL;
fCurrVertex = 0;
fAllocVertexCount = 0;
fTotalVertexCount = 0;
fVertexBounds.setLargestInverted();
}
GrBitmapTextContext* GrBitmapTextContext::Create(GrContext* context,
const SkDeviceProperties& props) {
return SkNEW_ARGS(GrBitmapTextContext, (context, props));
}
bool GrBitmapTextContext::canDraw(const SkPaint& paint, const SkMatrix& viewMatrix) {
return !SkDraw::ShouldDrawTextAsPaths(paint, viewMatrix);
}
inline void GrBitmapTextContext::init(const GrPaint& paint, const SkPaint& skPaint) {
GrTextContext::init(paint, skPaint);
fStrike = NULL;
fCurrTexture = NULL;
fCurrVertex = 0;
fVertices = NULL;
fAllocVertexCount = 0;
fTotalVertexCount = 0;
}
void GrBitmapTextContext::onDrawText(const GrPaint& paint, const SkPaint& skPaint,
const SkMatrix& viewMatrix,
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;
}
this->init(paint, skPaint);
SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
SkAutoGlyphCache autoCache(fSkPaint, &fDeviceProperties, &viewMatrix);
SkGlyphCache* cache = autoCache.getCache();
GrFontScaler* fontScaler = GetGrFontScaler(cache);
// transform our starting point
{
SkPoint loc;
viewMatrix.mapXY(x, y, &loc);
x = loc.fX;
y = loc.fY;
}
// need to measure first
int numGlyphs;
if (fSkPaint.getTextAlign() != SkPaint::kLeft_Align) {
SkVector stopVector;
numGlyphs = MeasureText(cache, glyphCacheProc, text, byteLength, &stopVector);
SkScalar stopX = stopVector.fX;
SkScalar stopY = stopVector.fY;
if (fSkPaint.getTextAlign() == SkPaint::kCenter_Align) {
stopX = SkScalarHalf(stopX);
stopY = SkScalarHalf(stopY);
}
x -= stopX;
y -= stopY;
} else {
numGlyphs = fSkPaint.textToGlyphs(text, byteLength, NULL);
}
fTotalVertexCount = kVerticesPerGlyph*numGlyphs;
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(viewMatrix);
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;
// if we have RGB, then we won't have any SkShaders so no need to use a localmatrix, but for
// performance reasons we just invert here instead
if (!viewMatrix.invert(&fLocalMatrix)) {
SkDebugf("Cannot invert viewmatrix\n");
return;
}
while (text < stop) {
const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);
fx += autokern.adjust(glyph);
if (glyph.fWidth) {
this->appendGlyph(GrGlyph::Pack(glyph.getGlyphID(),
glyph.getSubXFixed(),
glyph.getSubYFixed()),
SkFixedFloorToFixed(fx),
SkFixedFloorToFixed(fy),
fontScaler);
}
fx += glyph.fAdvanceX;
fy += glyph.fAdvanceY;
}
this->finish();
}
void GrBitmapTextContext::onDrawPosText(const GrPaint& paint, const SkPaint& skPaint,
const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset) {
SkASSERT(byteLength == 0 || text != NULL);
SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
// nothing to draw
if (text == NULL || byteLength == 0/* || fRC->isEmpty()*/) {
return;
}
this->init(paint, skPaint);
SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
SkAutoGlyphCache autoCache(fSkPaint, &fDeviceProperties, &viewMatrix);
SkGlyphCache* cache = autoCache.getCache();
GrFontScaler* fontScaler = GetGrFontScaler(cache);
// if we have RGB, then we won't have any SkShaders so no need to use a localmatrix, but for
// performance reasons we just invert here instead
if (!viewMatrix.invert(&fLocalMatrix)) {
SkDebugf("Cannot invert viewmatrix\n");
return;
}
int numGlyphs = fSkPaint.textToGlyphs(text, byteLength, NULL);
fTotalVertexCount = kVerticesPerGlyph*numGlyphs;
const char* stop = text + byteLength;
SkTextAlignProc alignProc(fSkPaint.getTextAlign());
SkTextMapStateProc tmsProc(viewMatrix, offset, scalarsPerPosition);
SkFixed halfSampleX = 0, halfSampleY = 0;
if (cache->isSubpixel()) {
// maybe we should skip the rounding if linearText is set
SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(viewMatrix);
SkFixed fxMask = ~0;
SkFixed fyMask = ~0;
if (kX_SkAxisAlignment == baseline) {
fyMask = 0;
halfSampleY = SK_FixedHalf;
} else if (kY_SkAxisAlignment == baseline) {
fxMask = 0;
halfSampleX = SK_FixedHalf;
}
if (SkPaint::kLeft_Align == fSkPaint.getTextAlign()) {
while (text < stop) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkFixed fx = SkScalarToFixed(tmsLoc.fX) + halfSampleX;
SkFixed fy = SkScalarToFixed(tmsLoc.fY) + halfSampleY;
const SkGlyph& glyph = glyphCacheProc(cache, &text,
fx & fxMask, fy & fyMask);
if (glyph.fWidth) {
this->appendGlyph(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;)
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkIPoint fixedLoc;
alignProc(tmsLoc, 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->appendGlyph(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) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkFixed fx = SkScalarToFixed(tmsLoc.fX) + SK_FixedHalf; //halfSampleX;
SkFixed fy = SkScalarToFixed(tmsLoc.fY) + SK_FixedHalf; //halfSampleY;
this->appendGlyph(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) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkIPoint fixedLoc;
alignProc(tmsLoc, glyph, &fixedLoc);
SkFixed fx = fixedLoc.fX + SK_FixedHalf; //halfSampleX;
SkFixed fy = fixedLoc.fY + SK_FixedHalf; //halfSampleY;
this->appendGlyph(GrGlyph::Pack(glyph.getGlyphID(),
glyph.getSubXFixed(),
glyph.getSubYFixed()),
SkFixedFloorToFixed(fx),
SkFixedFloorToFixed(fy),
fontScaler);
}
pos += scalarsPerPosition;
}
}
}
this->finish();
}
static size_t get_vertex_stride(GrMaskFormat maskFormat) {
switch (maskFormat) {
case kA8_GrMaskFormat:
return kGrayTextVASize;
case kARGB_GrMaskFormat:
return kColorTextVASize;
default:
return kLCDTextVASize;
}
}
static void* alloc_vertices(GrDrawTarget* drawTarget,
int numVertices,
GrMaskFormat maskFormat) {
if (numVertices <= 0) {
return NULL;
}
// set up attributes
void* vertices = NULL;
bool success = drawTarget->reserveVertexAndIndexSpace(numVertices,
get_vertex_stride(maskFormat),
0,
&vertices,
NULL);
GrAlwaysAssert(success);
return vertices;
}
inline bool GrBitmapTextContext::uploadGlyph(GrGlyph* glyph, GrFontScaler* scaler) {
if (!fStrike->glyphTooLargeForAtlas(glyph)) {
if (fStrike->addGlyphToAtlas(glyph, scaler)) {
return true;
}
// try to clear out an unused plot before we flush
if (fContext->getFontCache()->freeUnusedPlot(fStrike, glyph) &&
fStrike->addGlyphToAtlas(glyph, scaler)) {
return true;
}
if (c_DumpFontCache) {
#ifdef SK_DEVELOPER
fContext->getFontCache()->dump();
#endif
}
// before we purge the cache, we must flush any accumulated draws
this->flush();
fContext->flush();
// we should have an unused plot now
if (fContext->getFontCache()->freeUnusedPlot(fStrike, glyph) &&
fStrike->addGlyphToAtlas(glyph, scaler)) {
return true;
}
// we should never get here
SkASSERT(false);
}
return false;
}
void GrBitmapTextContext::appendGlyph(GrGlyph::PackedID packed,
SkFixed vx, SkFixed vy,
GrFontScaler* scaler) {
if (NULL == fDrawTarget) {
return;
}
if (NULL == fStrike) {
fStrike = fContext->getFontCache()->getStrike(scaler, false);
}
GrGlyph* glyph = fStrike->getGlyph(packed, scaler);
if (NULL == glyph || glyph->fBounds.isEmpty()) {
return;
}
vx += SkIntToFixed(glyph->fBounds.fLeft);
vy += SkIntToFixed(glyph->fBounds.fTop);
// keep them as ints until we've done the clip-test
SkFixed width = glyph->fBounds.width();
SkFixed height = glyph->fBounds.height();
// check if we clipped out
int x = vx >> 16;
int y = vy >> 16;
if (fClipRect.quickReject(x, y, x + width, y + height)) {
return;
}
// If the glyph is too large we fall back to paths
if (NULL == glyph->fPlot && !uploadGlyph(glyph, scaler)) {
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;
}
// flush any accumulated draws before drawing this glyph as a path.
this->flush();
SkMatrix translate;
translate.setTranslate(SkFixedToScalar(vx - SkIntToFixed(glyph->fBounds.fLeft)),
SkFixedToScalar(vy - SkIntToFixed(glyph->fBounds.fTop)));
SkPath tmpPath(*glyph->fPath);
tmpPath.transform(translate);
GrStrokeInfo strokeInfo(SkStrokeRec::kFill_InitStyle);
fContext->drawPath(fPaint, SkMatrix::I(), tmpPath, strokeInfo);
// remove this glyph from the vertices we need to allocate
fTotalVertexCount -= kVerticesPerGlyph;
return;
}
SkASSERT(glyph->fPlot);
GrDrawTarget::DrawToken drawToken = fDrawTarget->getCurrentDrawToken();
glyph->fPlot->setDrawToken(drawToken);
// now promote them to fixed (TODO: Rethink using fixed pt).
width = SkIntToFixed(width);
height = SkIntToFixed(height);
// the current texture/maskformat must match what the glyph needs
GrTexture* texture = glyph->fPlot->texture();
SkASSERT(texture);
if (fCurrTexture != texture || fCurrVertex + kVerticesPerGlyph > fAllocVertexCount) {
this->flush();
fCurrTexture = texture;
fCurrTexture->ref();
fCurrMaskFormat = glyph->fMaskFormat;
}
if (NULL == fVertices) {
int maxQuadVertices = kVerticesPerGlyph * fContext->getQuadIndexBuffer()->maxQuads();
fAllocVertexCount = SkMin32(fTotalVertexCount, maxQuadVertices);
fVertices = alloc_vertices(fDrawTarget, fAllocVertexCount, fCurrMaskFormat);
}
SkFixed tx = SkIntToFixed(glyph->fAtlasLocation.fX);
SkFixed ty = SkIntToFixed(glyph->fAtlasLocation.fY);
SkRect r;
r.fLeft = SkFixedToFloat(vx);
r.fTop = SkFixedToFloat(vy);
r.fRight = SkFixedToFloat(vx + width);
r.fBottom = SkFixedToFloat(vy + height);
fVertexBounds.joinNonEmptyArg(r);
size_t vertSize = get_vertex_stride(fCurrMaskFormat);
SkPoint* positions = reinterpret_cast<SkPoint*>(
reinterpret_cast<intptr_t>(fVertices) + vertSize * fCurrVertex);
positions->setRectFan(r.fLeft, r.fTop, r.fRight, r.fBottom, vertSize);
// The texture coords are last in both the with and without color vertex layouts.
SkPoint* textureCoords = reinterpret_cast<SkPoint*>(
reinterpret_cast<intptr_t>(positions) + vertSize - sizeof(SkPoint));
textureCoords->setRectFan(SkFixedToFloat(texture->texturePriv().normalizeFixedX(tx)),
SkFixedToFloat(texture->texturePriv().normalizeFixedY(ty)),
SkFixedToFloat(texture->texturePriv().normalizeFixedX(tx + width)),
SkFixedToFloat(texture->texturePriv().normalizeFixedY(ty + height)),
vertSize);
if (kA8_GrMaskFormat == fCurrMaskFormat) {
// color comes after position.
GrColor* colors = reinterpret_cast<GrColor*>(positions + 1);
for (int i = 0; i < 4; ++i) {
*colors = fPaint.getColor();
colors = reinterpret_cast<GrColor*>(reinterpret_cast<intptr_t>(colors) + vertSize);
}
}
fCurrVertex += 4;
}
void GrBitmapTextContext::flush() {
if (NULL == fDrawTarget) {
return;
}
if (fCurrVertex > 0) {
GrPipelineBuilder pipelineBuilder;
pipelineBuilder.setFromPaint(fPaint, fContext->getRenderTarget());
// setup our sampler state for our text texture/atlas
SkASSERT(SkIsAlign4(fCurrVertex));
SkASSERT(fCurrTexture);
SkASSERT(fStrike);
GrColor color = fPaint.getColor();
switch (fCurrMaskFormat) {
// Color bitmap text
case kARGB_GrMaskFormat: {
int a = fSkPaint.getAlpha();
color = SkColorSetARGB(a, a, a, a);
break;
}
// LCD text
case kA565_GrMaskFormat: {
// TODO: move supportsRGBCoverage check to setupCoverageEffect and only add LCD
// processor if the xp can support it. For now we will simply assume that if
// fUseLCDText is true, then we have a known color output.
const GrXPFactory* xpFactory = pipelineBuilder.getXPFactory();
if (!xpFactory->supportsRGBCoverage(0, kRGBA_GrColorComponentFlags)) {
SkDebugf("LCD Text will not draw correctly.\n");
}
break;
}
// Grayscale/BW text
case kA8_GrMaskFormat:
break;
default:
SkFAIL("Unexpected mask format.");
}
GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kNone_FilterMode);
if (kARGB_GrMaskFormat == fCurrMaskFormat) {
uint32_t textureUniqueID = fCurrTexture->getUniqueID();
if (textureUniqueID != fEffectTextureUniqueID ||
fCachedGeometryProcessor->color() != color) {
uint32_t flags = GrDefaultGeoProcFactory::kLocalCoord_GPType;
fCachedGeometryProcessor.reset(GrDefaultGeoProcFactory::Create(flags, color));
fCachedTextureProcessor.reset(GrSimpleTextureEffect::Create(fCurrTexture,
SkMatrix::I(),
params));
fEffectTextureUniqueID = textureUniqueID;
}
pipelineBuilder.addColorProcessor(fCachedTextureProcessor.get());
} else {
uint32_t textureUniqueID = fCurrTexture->getUniqueID();
if (textureUniqueID != fEffectTextureUniqueID ||
fCachedGeometryProcessor->color() != color ||
!fCachedGeometryProcessor->localMatrix().cheapEqualTo(fLocalMatrix)) {
bool hasColor = kA8_GrMaskFormat == fCurrMaskFormat;
bool opaqueVertexColors = GrColorIsOpaque(fPaint.getColor());
fCachedGeometryProcessor.reset(GrBitmapTextGeoProc::Create(color,
fCurrTexture,
params,
hasColor,
opaqueVertexColors,
fLocalMatrix));
fEffectTextureUniqueID = textureUniqueID;
}
}
int nGlyphs = fCurrVertex / kVerticesPerGlyph;
fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
fDrawTarget->drawIndexedInstances(&pipelineBuilder,
fCachedGeometryProcessor.get(),
kTriangles_GrPrimitiveType,
nGlyphs,
kVerticesPerGlyph,
kIndicesPerGlyph,
&fVertexBounds);
fDrawTarget->resetVertexSource();
fVertices = NULL;
fAllocVertexCount = 0;
// reset to be those that are left
fTotalVertexCount -= fCurrVertex;
fCurrVertex = 0;
fVertexBounds.setLargestInverted();
SkSafeSetNull(fCurrTexture);
}
}
inline void GrBitmapTextContext::finish() {
this->flush();
fTotalVertexCount = 0;
GrTextContext::finish();
}
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