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font: add scaled kerning 

Co-authored-by: Çağatay Güçlü <33038942+defektu@users.noreply.github.com>
This commit is contained in:
nmzik 2026-10-05 01:49:03 +04:00
parent 8e46a3ccfa
commit c753efdde7
1 changed files with 46 additions and 0 deletions
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46
src/libs/libFont.cpp
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@ -78,6 +78,9 @@ constexpr int SCE_FONT_TEXT_PARSER_RESULT_TERMINATE = 0;
constexpr int SCE_FONT_TEXT_PARSER_RESULT_ERROR = -1;
constexpr int SCE_FONT_WRITING_FORM_HORIZONTAL = 0x10;
constexpr int FONT_BITMAP_MAX_DIM = 128;
constexpr int FONT_ERROR_INVALID_PARAMETER = static_cast<int>(0x80460002u);
constexpr int FONT_ERROR_INVALID_FONT_HANDLE = static_cast<int>(0x80460005u);
constexpr int FONT_ERROR_NO_SUPPORT_CODE = static_cast<int>(0x80460041u);
struct FontMemory {
uint16_t type;
@ -118,6 +121,14 @@ struct FontGlyphMetrics {
} vertical;
};
struct FontKerning {
float offset_x;
float offset_y;
float position_x;
float position_y;
};
static_assert(sizeof(FontKerning) == 16);
struct FontRenderSurface {
void* buffer;
int32_t width_byte;
@ -2081,6 +2092,40 @@ int KYTY_SYSV_ABI FontGetRenderCharGlyphMetrics(FontHandle font_handle, uint32_t
return OK;
}
int KYTY_SYSV_ABI FontGetKerning(FontHandle font_handle, uint32_t pre_code, uint32_t code,
FontKerning* kerning) {
PRINT_NAME();
if (kerning == nullptr) {
return FONT_ERROR_INVALID_PARAMETER;
}
*kerning = {};
auto* font = static_cast<FontState*>(font_handle);
if (font == nullptr) {
return FONT_ERROR_INVALID_FONT_HANDLE;
}
if (pre_code == 0 || !ensure_stb_font(font)) {
return OK;
}
const auto glyph_index = [&](uint32_t value) {
if ((value & 0x80000000u) != 0) {
return static_cast<int>(value & 0xffffu);
}
return stbtt_FindGlyphIndex(&font->font_info, static_cast<int>(value));
};
const int left = glyph_index(pre_code);
const int right = glyph_index(code);
if (left <= 0 || left >= font->font_info.numGlyphs ||
right <= 0 || right >= font->font_info.numGlyphs) {
return FONT_ERROR_NO_SUPPORT_CODE;
}
kerning->offset_x = static_cast<float>(stbtt_GetGlyphKernAdvance(&font->font_info, left, right)) *
stbtt_ScaleForMappingEmToPixels(&font->font_info, font->scale_w);
LOGF("\t handle = 0x%016" PRIx64 ", pre_code = 0x%08" PRIx32 ", code = 0x%08" PRIx32
", offset_x = %f\n", reinterpret_cast<uint64_t>(font_handle), pre_code, code,
static_cast<double>(kerning->offset_x));
return OK;
}
int KYTY_SYSV_ABI FontGetCharGlyphMetrics(FontHandle font_handle, uint32_t code,
FontGlyphMetrics* metrics) {
PRINT_NAME();
@ -2253,6 +2298,7 @@ LIB_DEFINE(InitFont_1) {
LIB_FUNC("FXP359ygujs", Font::FontDestroyLibrary);
LIB_FUNC("C-4Qw5Srlyw", Font::FontGenerateCharGlyph);
LIB_FUNC("L97d+3OgMlE", Font::FontGetCharGlyphMetrics);
LIB_FUNC("sDuhHGNhHvE", Font::FontGetKerning);
LIB_FUNC("IQtleGLL5pQ", Font::FontGetRenderCharGlyphMetrics);
LIB_FUNC("8-zmgsxkBek", Font::FontGlyphDefineAttribute);
LIB_FUNC("whrS4oksXc4", Font::FontMemoryInit);