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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrTextContext.h"
#include "GrAtlas.h"
#include "GrContext.h"
#include "GrDrawTarget.h"
#include "GrFontScaler.h"
#include "GrIndexBuffer.h"
#include "GrTextStrike.h"
#include "GrTextStrike_impl.h"
#include "SkPath.h"
#include "SkStrokeRec.h"
// glyph rendering shares this stage with edge rendering (kEdgeEffectStage in GrContext) && SW path
// rendering (kPathMaskStage in GrSWMaskHelper)
static const int kGlyphMaskStage = GrPaint::kTotalStages;
static const int kGlyphCoordsAttributeIndex = 1;
void GrTextContext::flushGlyphs() {
if (NULL == fDrawTarget) {
return;
}
GrDrawState* drawState = fDrawTarget->drawState();
if (fCurrVertex > 0) {
// setup our sampler state for our text texture/atlas
GrAssert(GrIsALIGN4(fCurrVertex));
GrAssert(fCurrTexture);
GrTextureParams params(SkShader::kRepeat_TileMode, false);
// This effect could be stored with one of the cache objects (atlas?)
drawState->setEffect(kGlyphMaskStage,
GrSimpleTextureEffect::CreateWithCustomCoords(fCurrTexture, params),
kGlyphCoordsAttributeIndex)->unref();
if (!GrPixelConfigIsAlphaOnly(fCurrTexture->config())) {
if (kOne_GrBlendCoeff != fPaint.getSrcBlendCoeff() ||
kISA_GrBlendCoeff != fPaint.getDstBlendCoeff() ||
fPaint.hasColorStage()) {
GrPrintf("LCD Text will not draw correctly.\n");
}
// setup blend so that we get mask * paintColor + (1-mask)*dstColor
drawState->setBlendConstant(fPaint.getColor());
drawState->setBlendFunc(kConstC_GrBlendCoeff, kISC_GrBlendCoeff);
// don't modulate by the paint's color in the frag since we're
// already doing it via the blend const.
drawState->setColor(0xffffffff);
} 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->drawIndexedInstances(kTriangles_GrPrimitiveType,
nGlyphs,
4, 6);
fDrawTarget->resetVertexSource();
fVertices = NULL;
fMaxVertices = 0;
fCurrVertex = 0;
GrSafeSetNull(fCurrTexture);
}
drawState->disableStages();
fDrawTarget = NULL;
}
GrTextContext::GrTextContext(GrContext* context, const GrPaint& paint) : fPaint(paint) {
fContext = context;
fStrike = NULL;
fCurrTexture = NULL;
fCurrVertex = 0;
const GrClipData* clipData = context->getClip();
GrRect devConservativeBound;
clipData->fClipStack->getConservativeBounds(
-clipData->fOrigin.fX,
-clipData->fOrigin.fY,
context->getRenderTarget()->width(),
context->getRenderTarget()->height(),
&devConservativeBound);
devConservativeBound.roundOut(&fClipRect);
fAutoMatrix.setIdentity(fContext, &fPaint);
fDrawTarget = NULL;
fVertices = NULL;
fMaxVertices = 0;
}
GrTextContext::~GrTextContext() {
this->flushGlyphs();
if (fDrawTarget) {
fDrawTarget->drawState()->disableStages();
}
}
void GrTextContext::flush() {
this->flushGlyphs();
}
namespace {
// position + texture coord
extern const GrVertexAttrib gTextVertexAttribs[] = {
{kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding},
{kVec2f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}
};
};
void GrTextContext::drawPackedGlyph(GrGlyph::PackedID packed,
GrFixed vx, GrFixed vy,
GrFontScaler* scaler) {
if (NULL == fStrike) {
fStrike = fContext->getFontCache()->getStrike(scaler);
}
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
GrFixed width = glyph->fBounds.width();
GrFixed height = glyph->fBounds.height();
// check if we clipped out
if (true || NULL == glyph->fAtlas) {
int x = vx >> 16;
int y = vy >> 16;
if (fClipRect.quickReject(x, y, x + width, y + height)) {
// SkCLZ(3); // so we can set a break-point in the debugger
return;
}
}
if (NULL == glyph->fAtlas) {
if (fStrike->getGlyphAtlas(glyph, scaler)) {
goto HAS_ATLAS;
}
// before we purge the cache, we must flush any accumulated draws
this->flushGlyphs();
fContext->flush();
// try to purge
fContext->getFontCache()->purgeExceptFor(fStrike);
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(SkFixedToScalar(vx - SkIntToFixed(glyph->fBounds.fLeft)),
SkFixedToScalar(vy - SkIntToFixed(glyph->fBounds.fTop)));
GrPaint tmpPaint(fPaint);
am.setPreConcat(fContext, translate, &tmpPaint);
SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
fContext->drawPath(tmpPaint, *glyph->fPath, stroke);
return;
}
HAS_ATLAS:
GrAssert(glyph->fAtlas);
// now promote them to fixed (TODO: Rethink using fixed pt).
width = SkIntToFixed(width);
height = SkIntToFixed(height);
GrTexture* texture = glyph->fAtlas->texture();
GrAssert(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;
bool flush = false;
fDrawTarget = fContext->getTextTarget(fPaint);
if (NULL != fDrawTarget) {
fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(SK_ARRAY_COUNT(gTextVertexAttribs));
flush = fDrawTarget->geometryHints(&fMaxVertices, NULL);
}
if (flush) {
this->flushGlyphs();
fContext->flush();
// flushGlyphs() will reset fDrawTarget to NULL.
fDrawTarget = fContext->getTextTarget(fPaint);
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();
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);
GrAlwaysAssert(success);
GrAssert(2*sizeof(GrPoint) == fDrawTarget->getDrawState().getVertexSize());
}
GrFixed tx = SkIntToFixed(glyph->fAtlasLocation.fX);
GrFixed ty = SkIntToFixed(glyph->fAtlasLocation.fY);
fVertices[2*fCurrVertex].setRectFan(SkFixedToFloat(vx),
SkFixedToFloat(vy),
SkFixedToFloat(vx + width),
SkFixedToFloat(vy + height),
2 * sizeof(SkPoint));
fVertices[2*fCurrVertex+1].setRectFan(SkFixedToFloat(texture->normalizeFixedX(tx)),
SkFixedToFloat(texture->normalizeFixedY(ty)),
SkFixedToFloat(texture->normalizeFixedX(tx + width)),
SkFixedToFloat(texture->normalizeFixedY(ty + height)),
2 * sizeof(SkPoint));
fCurrVertex += 4;
}
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