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/*
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 "GrAtlas.h"
#include "GrClipIterator.h"
#include "GrContext.h"
#include "GrTextContext.h"
#include "GrTextStrike.h"
#include "GrTextStrike_impl.h"
#include "GrFontScaler.h"
static const GrVertexLayout VLAYOUT = GrDrawTarget::kTextFormat_VertexLayoutBit;
void GrTextContext::flushGlyphs() {
if (fCurrVertex > 0) {
GrDrawTarget::AutoStateRestore asr(fDrawTarget);
// setup our sampler state for our text texture/atlas
GrSamplerState sampler(GrSamplerState::kRepeat_WrapMode,
GrSamplerState::kRepeat_WrapMode,
GrSamplerState::kAlphaMod_SampleMode,
!fExtMatrix.isIdentity());
fDrawTarget->setSamplerState(sampler);
GrAssert(GrIsALIGN4(fCurrVertex));
int nIndices = fCurrVertex + (fCurrVertex >> 1);
GrAssert(fCurrTexture);
fDrawTarget->setTexture(fCurrTexture);
fDrawTarget->setTextureMatrix(GrMatrix::I());
fDrawTarget->setIndexSourceToBuffer(fContext->quadIndexBuffer());
fDrawTarget->drawIndexed(GrDrawTarget::kTriangles_PrimitiveType,
0, 0, fCurrVertex, nIndices);
fDrawTarget->releaseReservedGeometry();
fVertices = NULL;
fMaxVertices = 0;
fCurrVertex = 0;
fCurrTexture->unref();
fCurrTexture = NULL;
}
}
GrTextContext::GrTextContext(GrContext* context, const GrMatrix* extMatrix) {
fContext = context;
fStrike = NULL;
fCurrTexture = NULL;
fCurrVertex = 0;
fClipRect = context->getClip().getBounds();
if (NULL != extMatrix) {
fExtMatrix = *extMatrix;
} else {
fExtMatrix = GrMatrix::I();
}
if (!fExtMatrix.isIdentity()) {
GrMatrix inverse;
GrRect r;
r.set(fClipRect);
if (fExtMatrix.invert(&inverse)) {
inverse.mapRect(&r);
r.roundOut(&fClipRect);
}
}
fContext->getViewMatrix(&fOrigViewMatrix);
fContext->setViewMatrix(fExtMatrix);
fVertices = NULL;
fMaxVertices = 0;
fDrawTarget = fContext->getTextTarget();
}
GrTextContext::~GrTextContext() {
this->flushGlyphs();
fContext->setViewMatrix(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;
}
// must do this to flush inorder buffering before we purge
fContext->flushText();
// try to purge
fContext->getFontCache()->purgeExceptFor(fStrike);
if (fStrike->getGlyphAtlas(glyph, scaler)) {
goto HAS_ATLAS;
}
// Draw as a path, so we flush any accumulated glyphs first
this->flushGlyphs();
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;
}
GrPath::Iter iter(*glyph->fPath);
bool useTexture = false;
GrPoint translate;
translate.set(GrFixedToScalar(vx - GrIntToFixed(glyph->fBounds.fLeft)),
GrFixedToScalar(vy - GrIntToFixed(glyph->fBounds.fTop)));
fContext->drawPath(&iter, GrContext::kWinding_PathFill,
useTexture, &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(VLAYOUT,
&fMaxVertices,
NULL);
if (flush) {
this->flushGlyphs();
fContext->flushText();
fDrawTarget = fContext->getTextTarget();
fMaxVertices = kDefaultRequestedVerts;
// ignore return, no point in flushing again.
fDrawTarget->geometryHints(VLAYOUT,
&fMaxVertices,
NULL);
}
if (fMaxVertices < kMinRequestedVerts) {
fMaxVertices = kDefaultRequestedVerts;
} else if (fMaxVertices > (fContext->maxQuadsInIndexBuffer() * 4)) {
// don't exceed the limit of the index buffer
fMaxVertices = (fContext->maxQuadsInIndexBuffer() * 4);
}
bool success = fDrawTarget->reserveAndLockGeometry(VLAYOUT,
fMaxVertices, 0,
(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;
}
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