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Remove mbstowcs + malloc by using custom utf8 to code point code

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Crayon2000 2024-03-07 21:25:37 -05:00
parent 159ba73f5c
commit ba4996e6f2
1 changed files with 109 additions and 15 deletions
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124
GRRLIB/GRRLIB/GRRLIB_ttf.c
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@ -100,15 +100,67 @@ void GRRLIB_PrintfTTF(int x, int y, GRRLIB_ttfFont *myFont, const char *string,
return;
}
size_t length = strlen(string) + 1;
wchar_t *utf32 = (wchar_t*)malloc(length * sizeof(wchar_t));
if (utf32 != NULL) {
length = mbstowcs(utf32, string, length);
if (length > 0) {
utf32[length] = L'\0';
GRRLIB_PrintfTTFW(x, y, myFont, utf32, fontSize, color);
FT_Face Face = (FT_Face)myFont->face;
int penX = 0;
int penY = fontSize;
FT_GlyphSlot slot = Face->glyph;
FT_UInt previousGlyph = 0;
const u8 cR = R(color);
const u8 cG = G(color);
const u8 cB = B(color);
const u8 cA = A(color);
if (FT_Set_Pixel_Sizes(Face, 0, fontSize) != 0) {
FT_Set_Pixel_Sizes(Face, 0, 12);
}
free(utf32);
/* Loop over each character, until the
* end of the string is reached, or until the pixel width is too wide */
while(*string) {
wchar_t wchar;
if (((*(string + 0)) & 0x80) == 0x00) {
// Single-byte character (ASCII)
wchar = (wchar_t)*string;
string += 1;
}
else if (((*(string + 0)) & 0xE0) == 0xC0 && ((*(string + 1)) & 0xC0) == 0x80) {
// Two-byte character
wchar = ((wchar_t)(*string & 0x1F) << 6) | ((wchar_t)(*(string + 1)) & 0x3F);
string += 2;
}
else if (((*(string + 0)) & 0xF0) == 0xE0 && ((*(string + 1)) & 0xC0) == 0x80 && ((*(string + 2)) & 0xC0) == 0x80) {
// Three-byte character
wchar = ((wchar_t)(*string & 0x0F) << 12) | ((wchar_t)(*(string + 1) & 0x3F) << 6) | ((wchar_t)(*(string + 2)) & 0x3F);
string += 3;
}
else if (((*(string + 0)) & 0xF8) == 0xF0 && ((*(string + 1)) & 0xC0) == 0x80 && ((*(string + 2)) & 0xC0) == 0x80 && ((*(string + 3)) & 0xC0) == 0x80) {
// Four-byte character
wchar = ((wchar_t)(*string & 0x07) << 18) | ((wchar_t)(*(string + 1) & 0x3F) << 12) | ((wchar_t)(*(string + 2) & 0x3F) << 6) | ((wchar_t)(*(string + 3)) & 0x3F);
string += 4;
}
else {
// Invalid UTF-8 sequence
string++;
continue;
}
const FT_UInt glyphIndex = FT_Get_Char_Index(myFont->face, wchar);
if (myFont->kerning && previousGlyph && glyphIndex) {
FT_Vector delta;
FT_Get_Kerning(myFont->face, previousGlyph, glyphIndex, FT_KERNING_DEFAULT, &delta);
penX += delta.x >> 6;
}
if (FT_Load_Glyph(myFont->face, glyphIndex, FT_LOAD_RENDER) != 0) {
continue;
}
DrawBitmap(&slot->bitmap,
penX + slot->bitmap_left + x,
penY - slot->bitmap_top + y,
cR, cG, cB, cA);
penX += slot->advance.x >> 6;
previousGlyph = glyphIndex;
}
}
@ -203,15 +255,57 @@ u32 GRRLIB_WidthTTF(GRRLIB_ttfFont *myFont, const char *string, unsigned int fon
if (myFont == NULL || string == NULL) {
return 0;
}
u32 penX;
size_t length = strlen(string) + 1;
wchar_t *utf32 = (wchar_t*)malloc(length * sizeof(wchar_t));
length = mbstowcs(utf32, string, length);
utf32[length] = L'\0';
penX = GRRLIB_WidthTTFW(myFont, utf32, fontSize);
FT_Face Face = (FT_Face)myFont->face;
u32 penX = 0;
FT_UInt previousGlyph = 0;
free(utf32);
if (FT_Set_Pixel_Sizes(myFont->face, 0, fontSize) != 0) {
FT_Set_Pixel_Sizes(myFont->face, 0, 12);
}
while(*string) {
wchar_t wchar;
if (((*(string + 0)) & 0x80) == 0x00) {
// Single-byte character (ASCII)
wchar = (wchar_t)*string;
string += 1;
}
else if (((*(string + 0)) & 0xE0) == 0xC0 && ((*(string + 1)) & 0xC0) == 0x80) {
// Two-byte character
wchar = ((wchar_t)(*string & 0x1F) << 6) | ((wchar_t)(*(string + 1)) & 0x3F);
string += 2;
}
else if (((*(string + 0)) & 0xF0) == 0xE0 && ((*(string + 1)) & 0xC0) == 0x80 && ((*(string + 2)) & 0xC0) == 0x80) {
// Three-byte character
wchar = ((wchar_t)(*string & 0x0F) << 12) | ((wchar_t)(*(string + 1) & 0x3F) << 6) | ((wchar_t)(*(string + 2)) & 0x3F);
string += 3;
}
else if (((*(string + 0)) & 0xF8) == 0xF0 && ((*(string + 1)) & 0xC0) == 0x80 && ((*(string + 2)) & 0xC0) == 0x80 && ((*(string + 3)) & 0xC0) == 0x80) {
// Four-byte character
wchar = ((wchar_t)(*string & 0x07) << 18) | ((wchar_t)(*(string + 1) & 0x3F) << 12) | ((wchar_t)(*(string + 2) & 0x3F) << 6) | ((wchar_t)(*(string + 3)) & 0x3F);
string += 4;
}
else {
// Invalid UTF-8 sequence
string++;
continue;
}
const FT_UInt glyphIndex = FT_Get_Char_Index(myFont->face, wchar);
if (myFont->kerning && previousGlyph && glyphIndex) {
FT_Vector delta;
FT_Get_Kerning(Face, previousGlyph, glyphIndex, FT_KERNING_DEFAULT, &delta);
penX += delta.x >> 6;
}
if (FT_Load_Glyph(Face, glyphIndex, FT_LOAD_RENDER) != 0) {
continue;
}
penX += Face->glyph->advance.x >> 6;
previousGlyph = glyphIndex;
}
return penX;
}