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proper font fixes

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Matthew 2026-01-03 17:44:29 +11:00
parent eee6918981
commit be8814cda2
1 changed files with 69 additions and 54 deletions
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107
fonts.d
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@ -4,19 +4,26 @@ import dlibincludes;
import dlib.aliases;
import dlib.util;
import dlib.alloc;
import dlib.math;
import std.math.traits : isNaN;
struct FontAtlas
{
f32 size;
f32 units_per_em;
Glyph[128] glyphs;
FontMetrics metrics;
u32 size;
UVec2 dimensions;
alias metrics this;
}
struct FontMetrics
{
f32 ascent;
f32 descent;
f32 line_gap;
f32 max_advance;
f32 line_height;
u32 width;
u32 height;
Glyph[128] glyphs;
f32 max_advance;
}
struct Glyph
@ -86,39 +93,46 @@ DeMultiply(u8 color, u8 alpha)
return v > 255 ? 255 : cast(u8)v;
}
FontAtlasBuf
CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_top = true)
u32
TextSize(f32 s)
{
assert(dimension >= 128, "Dimension must be at least 128");
return cast(u32)((96.0f/72.0f) * s);
}
FontAtlasBuf
CreateAtlas(Arena* arena, FontFace font, u32 size, UVec2 atlas_dim, bool y_origin_top = true)
{
FontAtlasBuf abuf = {
data: Alloc!(u8)(arena, dimension * dimension * 4),
data: Alloc!(u8)(arena, atlas_dim.x * atlas_dim.y * 4),
atlas: {
size: size,
width: dimension,
height: dimension,
dimensions: atlas_dim,
},
};
// TODO: proper packing algorithm
if(font != null)
{
FT_Set_Pixel_Sizes(font, 0, cast(FT_UInt)((96.0f/72.0f) * size));
FT_Set_Pixel_Sizes(font, 0, TextSize(size));
i64 bbox_ymax = font.bbox.yMax >> 6;
i64 bbox_ymin = font.bbox.yMin >> 6;
abuf.atlas.line_height = size;
abuf.atlas.units_per_em = cast(f32)font.units_per_EM;
abuf.atlas.ascent = cast(f32)font.ascender;
abuf.atlas.descent = cast(f32)font.descender;
abuf.atlas.line_gap = cast(f32)(font.height - font.ascender + font.descender);
abuf.atlas.max_advance = cast(f32)(font.max_advance_width>>6);
i64 line_h = bbox_ymax - bbox_ymin;
u32 max_w, max_h, current_h, count;
u64 baseline = font.size.metrics.ascender >> 6;
u64 line_height = (font.size.metrics.height >> 6)+1;
Logf("%s %s", baseline, line_height);
abuf.atlas.line_height = line_height;
abuf.atlas.max_advance = font.size.metrics.max_advance >> 6;
u32 max_w, max_h, count;
i32 font_size = Float26(size);
const u32 PADDING = 2;
foreach(FT_ULong char_code; 0 .. 0x7F)
{
FT_Error res = FT_Load_Char(font, char_code, cast(FT_Int32)FT_LOAD_RENDER);
@ -129,25 +143,23 @@ CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_
u32 bmp_w = font.glyph.bitmap.width;
u32 bmp_h = font.glyph.bitmap.rows;
if(max_w + bmp_w > dimension)
if(max_w + bmp_w > atlas_dim.x)
{
max_h += current_h;
max_h += line_height+PADDING;
max_w = 0;
}
assert(max_h < dimension, "Unable to pack atlas within dimensions");
if(max_h > atlas_dim.y)
{
Logf("Unable to pack atlas within dimensions provided");
assert(false);
}
max_w += bmp_w;
current_h = bmp_h > current_h ? bmp_h : current_h;
count += 1;
}
const u32 PADDING = 2;
max_w = PADDING;
max_h = PADDING;
current_h = 0;
count = 0;
max_w = max_h = count = 0;
foreach(FT_ULong char_code; 0 .. 0x7F)
{
@ -160,24 +172,26 @@ CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_
FT_GlyphSlot glyph = font.glyph;
FT_Bitmap* bmp = &font.glyph.bitmap;
if(max_w + bmp.rows > dimension)
if(max_w + bmp.rows > atlas_dim.x)
{
max_h += cast(u32)(size) + PADDING;
max_h += line_height+PADDING;
max_w = PADDING;
}
i64 base = Max(baseline, font.glyph.bitmap_top);
switch(bmp.pixel_mode)
{
case FT_PIXEL_MODE_BGRA:
{
i32 x, y;
u64 x, y;
foreach(r; 0 .. bmp.rows)
{
y = cast(i32)(max_h + r);
y = (base - font.glyph.bitmap_top + r) + max_h;
foreach(c; 0 .. bmp.width)
{
x = max_w + c;
u64 offset = (y*dimension + x) * 4;
u64 offset = (y*atlas_dim.y + x) * 4;
u8 p_b = bmp.buffer[offset+0];
u8 p_g = bmp.buffer[offset+1];
@ -192,12 +206,12 @@ CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_
{
u32 pitch = bmp.pitch;
u8* buf = bmp.buffer;
i32 x, y;
u64 x, y;
foreach(r; 0 .. bmp.rows)
{
u8 bits = 0;
u8* buf_ptr = buf;
y = cast(i32)(max_h + r);
y = (base - font.glyph.bitmap_top + r) + max_h;
foreach(c; 0 .. bmp.width)
{
if((c & 7) == 0)
@ -207,7 +221,7 @@ CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_
}
x = max_w + c;
u64 offset = (y*dimension + x) * 4;
u64 offset = (y*atlas_dim.y + x) * 4;
abuf.data[offset .. offset+4] = [255, 255, 255, bits & 0x80 ? 255 : 0];
bits <<= 1;
@ -218,14 +232,15 @@ CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_
} break;
case FT_PIXEL_MODE_GRAY:
{
i32 x, y;
u64 x, y;
foreach(r; 0 .. bmp.rows)
{
y = cast(i32)(max_h + r);
y = (base - font.glyph.bitmap_top + r) + max_h;
Logf("y %s %s %s %s", baseline - font.glyph.bitmap_top +r, baseline, font.glyph.bitmap_top, r);
foreach(c; 0 .. bmp.width)
{
x = max_w + c;
u64 offset = (y*dimension + x) * 4;
u64 offset = (y*atlas_dim.y + x) * 4;
abuf.data[offset .. offset+4] = [255, 255, 255, bmp.buffer[r*bmp.pitch + c]];
}
@ -248,17 +263,16 @@ CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_
g.ch = cast(dchar)char_code;
g.advance = cast(f32)(glyph.advance.x >> 6);
g.plane_left = left;
g.plane_right = g.plane_left + width;
g.plane_top = cast(f32)(bbox_ymax) - top;
g.plane_bottom = g.plane_top + height;
g.plane_right = g.plane_left + bmp.width;
g.plane_top = 0.0;
g.plane_bottom = line_height;
g.atlas_top = max_h;
g.atlas_left = max_w;
g.atlas_bottom = max_h + bmp.rows;
g.atlas_bottom = max_h + line_height;
g.atlas_right = max_w + bmp.width;
max_w += bmp.width + PADDING;
current_h = bmp.rows > current_h ? bmp.rows : current_h;
count += 1;
}
@ -268,3 +282,4 @@ CreateAtlas(Arena* arena, FontFace font, f32 size, u32 dimension, bool y_origin_
}