/*
Copyright 2010 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "GrTextContext.h"
#include "GrAtlas.h"
#include "GrContext.h"
#include "GrTextStrike.h"
#include "GrTextStrike_impl.h"
#include "GrFontScaler.h"
#include "GrIndexBuffer.h"
#include "GrGpuVertex.h"
#include "GrDrawTarget.h"
enum {
kGlyphMaskStage = GrPaint::kTotalStages,
};
void GrTextContext::flushGlyphs() {
if (fCurrVertex > 0) {
GrDrawTarget::AutoStateRestore asr(fDrawTarget);
// setup our sampler state for our text texture/atlas
GrSamplerState::Filter filter;
if (fExtMatrix.isIdentity()) {
filter = GrSamplerState::kNearest_Filter;
} else {
filter = GrSamplerState::kBilinear_Filter;
}
GrSamplerState sampler(GrSamplerState::kRepeat_WrapMode,
GrSamplerState::kRepeat_WrapMode,
filter);
fDrawTarget->setSamplerState(kGlyphMaskStage, sampler);
GrAssert(GrIsALIGN4(fCurrVertex));
int nIndices = fCurrVertex + (fCurrVertex >> 1);
GrAssert(fCurrTexture);
fDrawTarget->setTexture(kGlyphMaskStage, fCurrTexture);
if (!GrPixelConfigIsAlphaOnly(fCurrTexture->config())) {
if (kOne_BlendCoeff != fPaint.fSrcBlendCoeff ||
kISA_BlendCoeff != fPaint.fDstBlendCoeff ||
fPaint.hasTexture()) {
GrPrintf("LCD Text will not draw correctly.\n");
}
// setup blend so that we get mask * paintColor + (1-mask)*dstColor
fDrawTarget->setBlendConstant(fPaint.fColor);
fDrawTarget->setBlendFunc(kConstC_BlendCoeff, kISC_BlendCoeff);
// don't modulate by the paint's color in the frag since we're
// already doing it via the blend const.
fDrawTarget->setColor(0xffffffff);
} else {
// set back to normal in case we took LCD path previously.
fDrawTarget->setBlendFunc(fPaint.fSrcBlendCoeff, fPaint.fDstBlendCoeff);
fDrawTarget->setColor(fPaint.fColor);
}
fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
fDrawTarget->drawIndexed(kTriangles_PrimitiveType,
0, 0, fCurrVertex, nIndices);
fDrawTarget->releaseReservedGeometry();
fVertices = NULL;
fMaxVertices = 0;
fCurrVertex = 0;
fCurrTexture->unref();
fCurrTexture = NULL;
}
}
GrTextContext::GrTextContext(GrContext* context,
const GrPaint& paint,
const GrMatrix* extMatrix) : fPaint(paint) {
fContext = context;
fStrike = NULL;
fCurrTexture = NULL;
fCurrVertex = 0;
if (NULL != extMatrix) {
fExtMatrix = *extMatrix;
} else {
fExtMatrix = GrMatrix::I();
}
if (context->getClip().hasConservativeBounds()) {
if (!fExtMatrix.isIdentity()) {
GrMatrix inverse;
GrRect r = context->getClip().getConservativeBounds();
if (fExtMatrix.invert(&inverse)) {
inverse.mapRect(&r);
r.roundOut(&fClipRect);
}
} else {
context->getClip().getConservativeBounds().roundOut(&fClipRect);
}
} else {
fClipRect.setLargest();
}
// save the context's original matrix off and restore in destructor
// this must be done before getTextTarget.
fOrigViewMatrix = fContext->getMatrix();
fContext->setMatrix(fExtMatrix);
fDrawTarget = fContext->getTextTarget(fPaint);
fVertices = NULL;
fMaxVertices = 0;
fVertexLayout =
GrDrawTarget::kTextFormat_VertexLayoutBit |
GrDrawTarget::StageTexCoordVertexLayoutBit(kGlyphMaskStage, 0);
int stageMask = paint.getActiveStageMask();
if (stageMask) {
GrMatrix inverseViewMatrix;
if (fOrigViewMatrix.invert(&inverseViewMatrix)) {
fDrawTarget->preConcatSamplerMatrices(stageMask,
inverseViewMatrix);
}
for (int i = 0; i < GrPaint::kTotalStages; ++i) {
if ((1 << i) & stageMask) {
fVertexLayout |=
GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(i);
GrAssert(i != kGlyphMaskStage);
}
}
}
}
GrTextContext::~GrTextContext() {
this->flushGlyphs();
fContext->setMatrix(fOrigViewMatrix);
}
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->flushText();
// try to purge
fContext->getFontCache()->purgeExceptFor(fStrike);
if (fStrike->getGlyphAtlas(glyph, scaler)) {
goto HAS_ATLAS;
}
if (NULL == glyph->fPath) {
GrPath* path = new GrPath;
if (!scaler->getGlyphPath(glyph->glyphID(), path)) {
// flag the glyph as being dead?
delete path;
return;
}
glyph->fPath = path;
}
GrPoint translate;
translate.set(GrFixedToScalar(vx - GrIntToFixed(glyph->fBounds.fLeft)),
GrFixedToScalar(vy - GrIntToFixed(glyph->fBounds.fTop)));
fContext->drawPath(fPaint, *glyph->fPath, kWinding_PathFill,
&translate);
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 = fDrawTarget->geometryHints(fVertexLayout,
&fMaxVertices,
NULL);
if (flush) {
this->flushGlyphs();
fContext->flushText();
fDrawTarget = fContext->getTextTarget(fPaint);
fMaxVertices = kDefaultRequestedVerts;
// ignore return, no point in flushing again.
fDrawTarget->geometryHints(fVertexLayout,
&fMaxVertices,
NULL);
}
int maxQuadVertices = 4 * fContext->getQuadIndexBuffer()->size() / (6 * sizeof(uint16_t));
if (fMaxVertices < kMinRequestedVerts) {
fMaxVertices = kDefaultRequestedVerts;
} else if (fMaxVertices > maxQuadVertices) {
// don't exceed the limit of the index buffer
fMaxVertices = maxQuadVertices;
}
bool success = fDrawTarget->reserveAndLockGeometry(fVertexLayout,
fMaxVertices, 0,
GrTCast<void**>(&fVertices),
NULL);
GrAlwaysAssert(success);
}
GrFixed tx = GrIntToFixed(glyph->fAtlasLocation.fX);
GrFixed ty = GrIntToFixed(glyph->fAtlasLocation.fY);
#if GR_GL_TEXT_TEXTURE_NORMALIZED
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;
}