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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 "GrGpuVertex.h"
#include "GrIndexBuffer.h"
#include "GrTextStrike.h"
#include "GrTextStrike_impl.h"
#include "SkPath.h"
enum {
kGlyphMaskStage = GrPaint::kTotalStages,
};
void GrTextContext::flushGlyphs() {
if (NULL == fDrawTarget) {
return;
}
GrDrawState* drawState = fDrawTarget->drawState();
if (fCurrVertex > 0) {
// setup our sampler state for our text texture/atlas
drawState->sampler(kGlyphMaskStage)->reset();
GrAssert(GrIsALIGN4(fCurrVertex));
GrAssert(fCurrTexture);
GrTextureParams params(SkShader::kRepeat_TileMode, false);
drawState->createTextureEffect(kGlyphMaskStage, fCurrTexture, params);
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;
fVertexLayout =
GrDrawTarget::kTextFormat_VertexLayoutBit |
GrDrawTarget::StageTexCoordVertexLayoutBit(kGlyphMaskStage, 0);
}
GrTextContext::~GrTextContext() {
this->flushGlyphs();
if (fDrawTarget) {
fDrawTarget->drawState()->disableStages();
}
}
void GrTextContext::flush() {
this->flushGlyphs();
}
static inline void setRectFan(GrGpuTextVertex v[4], int l, int t, int r, int b,
int stride) {
v[0 * stride].setI(l, t);
v[1 * stride].setI(l, b);
v[2 * stride].setI(r, b);
v[3 * stride].setI(r, t);
}
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 += GrIntToFixed(glyph->fBounds.fLeft);
vy += GrIntToFixed(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)) {
// Gr_clz(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;
GrMatrix translate;
translate.setTranslate(GrFixedToScalar(vx - GrIntToFixed(glyph->fBounds.fLeft)),
GrFixedToScalar(vy - GrIntToFixed(glyph->fBounds.fTop)));
GrPaint tmpPaint(fPaint);
am.setPreConcat(fContext, translate, &tmpPaint);
fContext->drawPath(tmpPaint, *glyph->fPath, kWinding_GrPathFill);
return;
}
HAS_ATLAS:
GrAssert(glyph->fAtlas);
// now promote them to fixed
width = GrIntToFixed(width);
height = GrIntToFixed(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 = (NULL != fDrawTarget) &&
fDrawTarget->geometryHints(fVertexLayout,
&fMaxVertices,
NULL);
if (flush) {
this->flushGlyphs();
fContext->flush();
}
fDrawTarget = fContext->getTextTarget(fPaint);
fMaxVertices = kDefaultRequestedVerts;
// ignore return, no point in flushing again.
fDrawTarget->geometryHints(fVertexLayout,
&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(
fVertexLayout,
fMaxVertices,
0,
GrTCast<void**>(&fVertices),
NULL);
GrAlwaysAssert(success);
}
GrFixed tx = GrIntToFixed(glyph->fAtlasLocation.fX);
GrFixed ty = GrIntToFixed(glyph->fAtlasLocation.fY);
#if GR_TEXT_SCALAR_IS_USHORT
int x = vx >> 16;
int y = vy >> 16;
int w = width >> 16;
int h = height >> 16;
setRectFan(&fVertices[2*fCurrVertex], x, y, x + w, y + h, 2);
setRectFan(&fVertices[2*fCurrVertex+1],
texture->normalizeFixedX(tx),
texture->normalizeFixedY(ty),
texture->normalizeFixedX(tx + width),
texture->normalizeFixedY(ty + height),
2);
#else
fVertices[2*fCurrVertex].setXRectFan(vx, vy, vx + width, vy + height,
2 * sizeof(GrGpuTextVertex));
fVertices[2*fCurrVertex+1].setXRectFan(texture->normalizeFixedX(tx),
texture->normalizeFixedY(ty),
texture->normalizeFixedX(tx + width),
texture->normalizeFixedY(ty + height),
2 * sizeof(GrGpuTextVertex));
#endif
fCurrVertex += 4;
}
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