320 lines
9.1 KiB
C++
320 lines
9.1 KiB
C++
// 12 february 2017
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#include "uipriv_windows.hpp"
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#include "draw.hpp"
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// we need to combine color and underline style into one unit for IDWriteLayout::SetDrawingEffect()
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// we also need to collect all the OpenType features and background blocks and add them all at once
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// TODO(TODO does not seem to apply here) this is the wrong approach; it causes Pango to end runs early, meaning attributes like the ligature attributes never get applied properly
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// TODO contextual alternates override ligatures?
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// TODO rename this struct to something that isn't exclusively foreach-ing?
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struct foreachParams {
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const uint16_t *s;
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IDWriteTextLayout *layout;
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std::map<size_t, textDrawingEffect *> *effects;
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std::map<size_t, IDWriteTypography *> *features;
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std::vector<backgroundFunc> *backgroundFuncs;
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};
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#define isCodepointStart(w) ((((uint16_t) (w)) < 0xDC00) || (((uint16_t) (w)) >= 0xE000))
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static void ensureEffectsInRange(struct foreachParams *p, size_t start, size_t end, std::function<void(textDrawingEffect *)> f)
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{
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size_t i;
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size_t *key;
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textDrawingEffect *t;
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for (i = start; i < end; i++) {
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// don't create redundant entries; see below
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if (!isCodepointStart(p->s[i]))
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continue;
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t = (*(p->effects))[i];
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if (t != NULL) {
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f(t);
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continue;
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}
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t = new textDrawingEffect;
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f(t);
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(*(p->effects))[i] = t;
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}
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}
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static void ensureFeaturesInRange(struct foreachParams *p, size_t start, size_t end)
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{
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size_t i;
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size_t *key;
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IDWriteTypography *t;
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HRESULT hr;
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for (i = start; i < end; i++) {
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// don't create redundant entries; see below
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if (!isCodepointStart(p->s[i]))
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continue;
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t = (*(p->features))[i];
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if (t != NULL)
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continue;
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hr = dwfactory->CreateTypography(&t);
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if (hr != S_OK)
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logHRESULT(L"error creating IDWriteTypography", hr);
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(*(p->features))[i] = t;
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}
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}
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static backgroundFunc mkBackgroundFunc(size_t start, size_t end, double r, double g, double b, double a)
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{
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return [=](uiDrawContext *c, uiDrawTextLayout *layout, double x, double y) {
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uiDrawBrush brush;
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brush.Type = uiDrawBrushTypeSolid;
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brush.R = r;
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brush.G = g;
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brush.B = b;
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brush.A = a;
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drawTextBackground(c, x, y, layout, start, end, &brush, 0);
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};
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}
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struct otParam {
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struct foreachParams *p;
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size_t start;
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size_t end;
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};
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static void doOpenType(const char *featureTag, uint32_t param, void *data)
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{
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struct otParam *p = (struct otParam *) data;
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size_t i;
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IDWriteTypography *t;
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DWRITE_FONT_FEATURE feature;
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HRESULT hr;
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feature.nameTag = (DWRITE_FONT_FEATURE_TAG) DWRITE_MAKE_OPENTYPE_TAG(
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featureTag[0],
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featureTag[1],
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featureTag[2],
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featureTag[3]);
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feature.parameter = param;
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ensureFeaturesInRange(p->p, p->start, p->end);
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for (i = p->start; i < p->end; i++) {
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// don't use redundant entries; see below
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if (!isCodepointStart(p->p->s[i]))
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continue;
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t = (*(p->p->features))[i];
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hr = t->AddFontFeature(feature);
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if (hr != S_OK)
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logHRESULT(L"error adding feature to IDWriteTypography", hr);
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}
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}
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static int processAttribute(uiAttributedString *s, uiAttributeSpec *spec, size_t start, size_t end, void *data)
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{
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struct foreachParams *p = (struct foreachParams *) data;
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DWRITE_TEXT_RANGE range;
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WCHAR *wfamily;
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size_t ostart, oend;
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BOOL hasUnderline;
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uint32_t vertval;
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WCHAR *localeName;
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struct otParam op;
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HRESULT hr;
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ostart = start;
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oend = end;
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start = attrstrUTF8ToUTF16(s, start);
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end = attrstrUTF8ToUTF16(s, end);
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range.startPosition = start;
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range.length = end - start;
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switch (spec->Type) {
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case uiAttributeFamily:
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wfamily = toUTF16((char *) (spec->Value));
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hr = p->layout->SetFontFamilyName(wfamily, range);
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if (hr != S_OK)
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logHRESULT(L"error applying family name attribute", hr);
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uiFree(wfamily);
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break;
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case uiAttributeSize:
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hr = p->layout->SetFontSize(
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// TODO unify with drawtext.cpp
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#define pointSizeToDWriteSize(size) (size * (96.0 / 72.0))
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pointSizeToDWriteSize(spec->Double),
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range);
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if (hr != S_OK)
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logHRESULT(L"error applying size attribute", hr);
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break;
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case uiAttributeWeight:
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// TODO reverse the misalignment from drawtext.cpp if it is corrected
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hr = p->layout->SetFontWeight(
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(DWRITE_FONT_WEIGHT) (spec->Value),
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range);
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if (hr != S_OK)
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logHRESULT(L"error applying weight attribute", hr);
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break;
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case uiAttributeItalic:
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hr = p->layout->SetFontStyle(
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dwriteItalics[(uiDrawTextItalic) (spec->Value)],
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range);
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if (hr != S_OK)
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logHRESULT(L"error applying italic attribute", hr);
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break;
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case uiAttributeStretch:
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hr = p->layout->SetFontStretch(
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dwriteStretches[(uiDrawTextStretch) (spec->Value)],
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range);
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if (hr != S_OK)
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logHRESULT(L"error applying stretch attribute", hr);
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break;
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case uiAttributeColor:
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ensureEffectsInRange(p, start, end, [=](textDrawingEffect *t) {
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t->hasColor = true;
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t->r = spec->R;
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t->g = spec->G;
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t->b = spec->B;
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t->a = spec->A;
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});
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break;
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case uiAttributeBackground:
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p->backgroundFuncs->push_back(
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mkBackgroundFunc(ostart, oend,
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spec->R, spec->G, spec->B, spec->A));
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break;
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case uiAttributeVerticalForms:
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// LONGTERM 8 and/or 8.1 add other methods for vertical text
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op.p = p;
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op.start = start;
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op.end = end;
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vertval = 0;
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if (spec->Value != 0)
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vertval = 1;
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doOpenType("vert", vertval, &op);
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doOpenType("vrt2", vertval, &op);
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doOpenType("vkrn", vertval, &op);
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doOpenType("vrtr", vertval, &op);
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break;
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case uiAttributeUnderline:
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ensureEffectsInRange(p, start, end, [=](textDrawingEffect *t) {
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t->hasUnderline = true;
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t->u = (uiDrawUnderlineStyle) (spec->Value);
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});
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// mark that we have an underline; otherwise, DirectWrite will never call our custom renderer's DrawUnderline() method
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hasUnderline = FALSE;
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if ((uiDrawUnderlineStyle) (spec->Value) != uiDrawUnderlineStyleNone)
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hasUnderline = TRUE;
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hr = p->layout->SetUnderline(hasUnderline, range);
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if (hr != S_OK)
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logHRESULT(L"error applying underline attribute", hr);
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break;
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case uiAttributeUnderlineColor:
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switch (spec->Value) {
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case uiDrawUnderlineColorCustom:
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ensureEffectsInRange(p, start, end, [=](textDrawingEffect *t) {
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t->hasUnderlineColor = true;
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t->ur = spec->R;
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t->ug = spec->G;
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t->ub = spec->B;
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t->ua = spec->A;
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});
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break;
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// TODO see if Microsoft has any standard colors for this
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case uiDrawUnderlineColorSpelling:
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// TODO GtkTextView style property error-underline-color
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ensureEffectsInRange(p, start, end, [=](textDrawingEffect *t) {
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t->hasUnderlineColor = true;
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t->ur = 1.0;
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t->ug = 0.0;
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t->ub = 0.0;
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t->ua = 1.0;
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});
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break;
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case uiDrawUnderlineColorGrammar:
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ensureEffectsInRange(p, start, end, [=](textDrawingEffect *t) {
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t->hasUnderlineColor = true;
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t->ur = 0.0;
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t->ug = 1.0;
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t->ub = 0.0;
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t->ua = 1.0;
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});
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break;
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case uiDrawUnderlineColorAuxiliary:
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ensureEffectsInRange(p, start, end, [=](textDrawingEffect *t) {
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t->hasUnderlineColor = true;
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t->ur = 0.0;
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t->ug = 0.0;
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t->ub = 1.0;
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t->ua = 1.0;
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});
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break;
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}
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break;
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// locale names are specified as BCP 47: https://msdn.microsoft.com/en-us/library/windows/desktop/dd373814(v=vs.85).aspx https://www.ietf.org/rfc/rfc4646.txt
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case uiAttributeLanguage:
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localeName = toUTF16((char *) (spec->Value));
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hr = p->layout->SetLocaleName(localeName, range);
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if (hr != S_OK)
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logHRESULT(L"error applying locale name attribute", hr);
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uiFree(localeName);
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break;
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// TODO
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default:
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// handle typographic features
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op.p = p;
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op.start = start;
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op.end = end;
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// TODO check if unhandled and complain
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specToOpenType(spec, doOpenType, &op);
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break;
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}
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return 0;
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}
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static void applyAndFreeEffectsAttributes(struct foreachParams *p)
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{
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DWRITE_TEXT_RANGE range;
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HRESULT hr;
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for (auto iter = p->effects->begin(); iter != p->effects->end(); iter++) {
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// make sure we cover an entire code point
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range.startPosition = iter->first;
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range.length = 1;
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if (!isCodepointStart(p->s[iter->first]))
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range.length = 2;
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hr = p->layout->SetDrawingEffect(iter->second, range);
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if (hr != S_OK)
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logHRESULT(L"error applying drawing effects attributes", hr);
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iter->second->Release();
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}
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delete p->effects;
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}
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static void applyAndFreeFeatureAttributes(struct foreachParams *p)
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{
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DWRITE_TEXT_RANGE range;
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HRESULT hr;
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for (auto iter = p->features->begin(); iter != p->features->end(); iter++) {
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// make sure we cover an entire code point
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range.startPosition = iter->first;
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range.length = 1;
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if (!isCodepointStart(p->s[iter->first]))
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range.length = 2;
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hr = p->layout->SetTypography(iter->second, range);
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if (hr != S_OK)
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logHRESULT(L"error applying typographic features attributes", hr);
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iter->second->Release();
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}
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delete p->features;
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}
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void attrstrToIDWriteTextLayoutAttrs(uiDrawTextLayoutParams *p, IDWriteTextLayout *layout, std::vector<backgroundFunc> **backgroundFuncs)
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{
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struct foreachParams fep;
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fep.s = attrstrUTF16(p->String);
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fep.layout = layout;
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fep.effects = new std::map<size_t, textDrawingEffect *>;
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fep.features = new std::map<size_t, IDWriteTypography *>;
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fep.backgroundFuncs = new std::vector<backgroundFunc>;
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uiAttributedStringForEachAttribute(p->String, processAttribute, &fep);
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applyAndFreeEffectsAttributes(&fep);
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applyAndFreeFeatureAttributes(&fep);
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*backgroundFuncs = fep.backgroundFuncs;
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}
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