glyph_metrics_t QFontEngineDirectWrite::alphaMapBoundingBox(glyph_t glyph, QFixed subPixelPosition,
const QTransform &matrix,
GlyphFormat /*format*/)
{
glyph_metrics_t bbox = QFontEngine::boundingBox(glyph, matrix); // To get transformed advance
UINT16 glyphIndex = glyph;
FLOAT glyphAdvance = 0;
DWRITE_GLYPH_OFFSET glyphOffset;
glyphOffset.advanceOffset = 0;
glyphOffset.ascenderOffset = 0;
DWRITE_GLYPH_RUN glyphRun;
glyphRun.fontFace = m_directWriteFontFace;
glyphRun.fontEmSize = fontDef.pixelSize;
glyphRun.glyphCount = 1;
glyphRun.glyphIndices = &glyphIndex;
glyphRun.glyphAdvances = &glyphAdvance;
glyphRun.isSideways = false;
glyphRun.bidiLevel = 0;
glyphRun.glyphOffsets = &glyphOffset;
DWRITE_MATRIX transform;
transform.dx = subPixelPosition.toReal();
transform.dy = 0;
transform.m11 = matrix.m11();
transform.m12 = matrix.m12();
transform.m21 = matrix.m21();
transform.m22 = matrix.m22();
IDWriteGlyphRunAnalysis *glyphAnalysis = NULL;
HRESULT hr = m_directWriteFactory->CreateGlyphRunAnalysis(
&glyphRun,
1.0f,
&transform,
DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC,
DWRITE_MEASURING_MODE_NATURAL,
0.0, 0.0,
&glyphAnalysis
);
if (SUCCEEDED(hr)) {
RECT rect;
glyphAnalysis->GetAlphaTextureBounds(DWRITE_TEXTURE_CLEARTYPE_3x1, &rect);
glyphAnalysis->Release();
return glyph_metrics_t(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
bbox.xoff, bbox.yoff);
} else {
return glyph_metrics_t();
}
}
STDMETHODIMP CustomDWriteRender::DrawGlyphRun( __maybenull void* clientDrawingContext, FLOAT baselineOriginX, FLOAT baselineOriginY, DWRITE_MEASURING_MODE measuringMode, __in DWRITE_GLYPH_RUN const* glyphRun, __in DWRITE_GLYPH_RUN_DESCRIPTION const* glyphRunDescription, __maybenull IUnknown* clientDrawingEffect )
{
HRESULT hr;
IDWriteGlyphRunAnalysis* glyphRunAnalysis;
DWTextBox::DWTBContext* ctx = static_cast<DWTextBox::DWTBContext*>(clientDrawingContext);
ci::Surface* finalSurface = ctx->surface;
RECT textureBounds;
hr = mDWriteFactory->CreateGlyphRunAnalysis(glyphRun,0.75f,NULL,DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC,DWRITE_MEASURING_MODE_GDI_CLASSIC,0.0f,0.0f,&glyphRunAnalysis);
if(hr!=S_OK)
{
OutputDebugString(L"Error!\n");
}
glyphRunAnalysis->GetAlphaTextureBounds(DWRITE_TEXTURE_CLEARTYPE_3x1,&textureBounds);
int width = textureBounds.right-textureBounds.left;
int height = textureBounds.bottom -textureBounds.top;
ci::Surface surface(width,height,true,ci::SurfaceChannelOrder::ARGB);
//surface.setPremultiplied(true);
uint8_t *dataAlpha = static_cast<uint8_t*>(malloc(width*height*4));
uint8_t *data = static_cast<uint8_t*>(malloc(width*height*3));
DWRITE_FONT_METRICS fontMetrics;
glyphRun->fontFace->GetMetrics(&fontMetrics);
glyphRunAnalysis->CreateAlphaTexture(DWRITE_TEXTURE_CLEARTYPE_3x1,&textureBounds,data,width*height*3);
Concurrency::parallel_for(0,width*height,[&](int i){
float combAlpha = (data[i*3] + data[i*3+1] +data[i*3+2])/3;
float scale = combAlpha/255;
dataAlpha[i*4+0] = combAlpha;
dataAlpha[i*4+1] = 255*scale;//data[i*3+0];
dataAlpha[i*4+2] = 255*scale;//data[i*3+0];
dataAlpha[i*4+3] = 255*scale;//data[i*3+0];
//dataAlpha[i*4+0] = (data[i*3] + data[i*3+1] +data[i*3+2])/3;
});
memcpy(surface.getData(),dataAlpha,width*height*4);
float ratio = (float)(glyphRun->fontEmSize)/(float)fontMetrics.designUnitsPerEm;
float ascend = surface.getBounds().y2 + fontMetrics.descent*ratio;
//finalSurface->copyFrom(surface,surface.getBounds(),Vec2i(baselineOriginX,baselineOriginY-ascend));
ci::ip::blend(finalSurface,surface,surface.getBounds(),Vec2i(baselineOriginX+textureBounds.left,baselineOriginY+textureBounds.top));
//mTexture = gl::Texture(surface);
free (data);
free (dataAlpha);
return S_OK;
}
QImage QFontEngineDirectWrite::imageForGlyph(glyph_t t,
QFixed subPixelPosition,
int margin,
const QTransform &xform)
{
UINT16 glyphIndex = t;
FLOAT glyphAdvance = 0;
DWRITE_GLYPH_OFFSET glyphOffset;
glyphOffset.advanceOffset = 0;
glyphOffset.ascenderOffset = 0;
DWRITE_GLYPH_RUN glyphRun;
glyphRun.fontFace = m_directWriteFontFace;
glyphRun.fontEmSize = fontDef.pixelSize;
glyphRun.glyphCount = 1;
glyphRun.glyphIndices = &glyphIndex;
glyphRun.glyphAdvances = &glyphAdvance;
glyphRun.isSideways = false;
glyphRun.bidiLevel = 0;
glyphRun.glyphOffsets = &glyphOffset;
DWRITE_MATRIX transform;
transform.dx = subPixelPosition.toReal();
transform.dy = 0;
transform.m11 = xform.m11();
transform.m12 = xform.m12();
transform.m21 = xform.m21();
transform.m22 = xform.m22();
IDWriteGlyphRunAnalysis *glyphAnalysis = NULL;
HRESULT hr = m_directWriteFactory->CreateGlyphRunAnalysis(
&glyphRun,
1.0f,
&transform,
DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC,
DWRITE_MEASURING_MODE_NATURAL,
0.0, 0.0,
&glyphAnalysis
);
if (SUCCEEDED(hr)) {
RECT rect;
glyphAnalysis->GetAlphaTextureBounds(DWRITE_TEXTURE_CLEARTYPE_3x1, &rect);
rect.left -= margin;
rect.top -= margin;
rect.right += margin;
rect.bottom += margin;
int width = rect.right - rect.left;
int height = rect.bottom - rect.top;
int size = width * height * 3;
if (size > 0) {
BYTE *alphaValues = new BYTE[size];
qMemSet(alphaValues, size, 0);
hr = glyphAnalysis->CreateAlphaTexture(DWRITE_TEXTURE_CLEARTYPE_3x1,
&rect,
alphaValues,
size);
if (SUCCEEDED(hr)) {
QImage img(width, height, QImage::Format_RGB32);
img.fill(0xffffffff);
for (int y=0; y<height; ++y) {
uint *dest = reinterpret_cast<uint *>(img.scanLine(y));
BYTE *src = alphaValues + width * 3 * y;
for (int x=0; x<width; ++x) {
dest[x] = *(src) << 16
| *(src + 1) << 8
| *(src + 2);
src += 3;
}
}
delete[] alphaValues;
glyphAnalysis->Release();
return img;
} else {
delete[] alphaValues;
glyphAnalysis->Release();
qErrnoWarning("QFontEngineDirectWrite::imageForGlyph: CreateAlphaTexture failed");
}
}
} else {
qErrnoWarning("QFontEngineDirectWrite::imageForGlyph: CreateGlyphRunAnalysis failed");
}
return QImage();
}
