Nikolay Sivov : dwrite: Use better font matching algorithm based on weight /stretch/style triples.
Module: wine Branch: master Commit: f5f025f1ddbeb5680c7b51d3b95857d0f7818233 URL: http://source.winehq.org/git/wine.git/?a=commit;h=f5f025f1ddbeb5680c7b51d3b9... Author: Nikolay Sivov <nsivov(a)codeweavers.com> Date: Mon Aug 10 13:51:28 2015 +0300 dwrite: Use better font matching algorithm based on weight/stretch/style triples. --- dlls/dwrite/font.c | 103 ++++++++++++++++++++++++++++++++++++----------- dlls/dwrite/tests/font.c | 2 +- 2 files changed, 80 insertions(+), 25 deletions(-) diff --git a/dlls/dwrite/font.c b/dlls/dwrite/font.c index 6036720..eda6378 100644 --- a/dlls/dwrite/font.c +++ b/dlls/dwrite/font.c @@ -42,6 +42,12 @@ static const FLOAT RECOMMENDED_OUTLINE_AA_THRESHOLD = 100.0f; static const FLOAT RECOMMENDED_OUTLINE_A_THRESHOLD = 350.0f; static const FLOAT RECOMMENDED_NATURAL_PPEM = 20.0f; +struct dwrite_font_propvec { + FLOAT stretch; + FLOAT style; + FLOAT weight; +}; + struct dwrite_font_data { LONG ref; @@ -49,6 +55,8 @@ struct dwrite_font_data { DWRITE_FONT_STRETCH stretch; DWRITE_FONT_WEIGHT weight; DWRITE_PANOSE panose; + struct dwrite_font_propvec propvec; + DWRITE_FONT_METRICS1 metrics; IDWriteLocalizedStrings *info_strings[DWRITE_INFORMATIONAL_STRING_POSTSCRIPT_CID_NAME+1]; @@ -257,6 +265,23 @@ static void* get_fontface_table(struct dwrite_fontface *fontface, UINT32 tag, st return table->data; } +static void init_font_prop_vec(const struct dwrite_font_props *props, struct dwrite_font_propvec *vec) +{ + vec->stretch = ((INT32)props->stretch - DWRITE_FONT_STRETCH_NORMAL) * 11.0f; + vec->style = props->style * 7.0f; + vec->weight = ((INT32)props->weight - DWRITE_FONT_WEIGHT_NORMAL) / 100.0f * 5.0f; +} + +static FLOAT get_font_prop_vec_distance(const struct dwrite_font_propvec *left, const struct dwrite_font_propvec *right) +{ + return powf(left->stretch - right->stretch, 2) + powf(left->style - right->style, 2) + powf(left->weight - right->weight, 2); +} + +static FLOAT get_font_prop_vec_dotproduct(const struct dwrite_font_propvec *left, const struct dwrite_font_propvec *right) +{ + return left->stretch * right->stretch + left->style * right->style + left->weight * right->weight; +} + static inline void* get_fontface_cmap(struct dwrite_fontface *fontface) { return get_fontface_table(fontface, MS_CMAP_TAG, &fontface->cmap); @@ -1552,14 +1577,44 @@ static HRESULT WINAPI dwritefontfamily_GetFamilyNames(IDWriteFontFamily *iface, return clone_localizedstring(This->data->familyname, names); } -static inline BOOL is_matching_font_style(DWRITE_FONT_STYLE style, DWRITE_FONT_STYLE font_style) +static BOOL is_better_font_match(const struct dwrite_font_propvec *next, const struct dwrite_font_propvec *cur, + const struct dwrite_font_propvec *req) { - if (style == font_style) + FLOAT cur_to_req = get_font_prop_vec_distance(cur, req); + FLOAT next_to_req = get_font_prop_vec_distance(next, req); + FLOAT cur_req_prod, next_req_prod; + + if (next_to_req < cur_to_req) return TRUE; - if (((style == DWRITE_FONT_STYLE_ITALIC) || (style == DWRITE_FONT_STYLE_OBLIQUE)) && font_style == DWRITE_FONT_STYLE_NORMAL) + if (next_to_req > cur_to_req) + return FALSE; + + cur_req_prod = get_font_prop_vec_dotproduct(cur, req); + next_req_prod = get_font_prop_vec_dotproduct(next, req); + + if (next_req_prod > cur_req_prod) return TRUE; + if (next_req_prod < cur_req_prod) + return FALSE; + + if (next->stretch > cur->stretch) + return TRUE; + if (next->stretch < cur->stretch) + return FALSE; + + if (next->style > cur->style) + return TRUE; + if (next->style < cur->style) + return FALSE; + + if (next->weight > cur->weight) + return TRUE; + if (next->weight < cur->weight) + return FALSE; + + /* full match, no reason to prefer new variant */ return FALSE; } @@ -1567,35 +1622,34 @@ static HRESULT WINAPI dwritefontfamily_GetFirstMatchingFont(IDWriteFontFamily *i DWRITE_FONT_STRETCH stretch, DWRITE_FONT_STYLE style, IDWriteFont **font) { struct dwrite_fontfamily *This = impl_from_IDWriteFontFamily(iface); - UINT32 min_weight_diff = ~0u; - int found = -1, i; + struct dwrite_font_props reqprops = { style, stretch, weight }; + DWRITE_FONT_SIMULATIONS simulations; + struct dwrite_font_propvec req; + struct dwrite_font_data *match; + UINT32 i; TRACE("(%p)->(%d %d %d %p)\n", This, weight, stretch, style, font); - for (i = 0; i < This->data->font_count; i++) { - if (is_matching_font_style(style, This->data->fonts[i]->style) && stretch == This->data->fonts[i]->stretch) { - DWRITE_FONT_WEIGHT font_weight = This->data->fonts[i]->weight; - UINT32 weight_diff = abs(font_weight - weight); - if (weight_diff < min_weight_diff) { - min_weight_diff = weight_diff; - found = i; - } - } + if (This->data->font_count == 0) { + *font = NULL; + return DWRITE_E_NOFONT; } - if (found != -1) { - DWRITE_FONT_SIMULATIONS simulations = DWRITE_FONT_SIMULATIONS_NONE; + init_font_prop_vec(&reqprops, &req); + match = This->data->fonts[0]; - if (((style == DWRITE_FONT_STYLE_ITALIC) || (style == DWRITE_FONT_STYLE_OBLIQUE)) && - This->data->fonts[found]->style == DWRITE_FONT_STYLE_NORMAL) { - simulations = DWRITE_FONT_SIMULATIONS_OBLIQUE; - } - return create_font(This->data->fonts[found], iface, simulations, font); + for (i = 1; i < This->data->font_count; i++) { + if (is_better_font_match(&This->data->fonts[i]->propvec, &match->propvec, &req)) + match = This->data->fonts[i]; } - else { - *font = NULL; - return DWRITE_E_NOFONT; + + simulations = DWRITE_FONT_SIMULATIONS_NONE; + if (((style == DWRITE_FONT_STYLE_ITALIC) || (style == DWRITE_FONT_STYLE_OBLIQUE)) && + match->style == DWRITE_FONT_STYLE_NORMAL) { + simulations = DWRITE_FONT_SIMULATIONS_OBLIQUE; } + + return create_font(match, iface, simulations, font); } static HRESULT WINAPI dwritefontfamily_GetMatchingFonts(IDWriteFontFamily *iface, DWRITE_FONT_WEIGHT weight, @@ -1941,6 +1995,7 @@ static HRESULT init_font_data(IDWriteFactory2 *factory, IDWriteFontFile *file, U data->stretch = props.stretch; data->weight = props.weight; data->panose = props.panose; + init_font_prop_vec(&props, &data->propvec); if (tt_os2) IDWriteFontFileStream_ReleaseFileFragment(*stream, os2_context); diff --git a/dlls/dwrite/tests/font.c b/dlls/dwrite/tests/font.c index 0664a9a..7ee5c8a 100644 --- a/dlls/dwrite/tests/font.c +++ b/dlls/dwrite/tests/font.c @@ -705,7 +705,7 @@ todo_wine ok(hr == S_OK, "got 0x%08x\n", hr); weight = IDWriteFont_GetWeight(font); - ok(weight == DWRITE_FONT_WEIGHT_NORMAL || broken(weight == DWRITE_FONT_WEIGHT_BOLD) /* win7 w/o SP */, + ok(weight == DWRITE_FONT_WEIGHT_NORMAL || weight == DWRITE_FONT_WEIGHT_BOLD, "got %d\n", weight); IDWriteFont_Release(font);
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Alexandre Julliard