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adjust px offset -> byte offset path for new text measuring fixes

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This commit is contained in:
Ryan Fleury
2024-06-22 20:19:24 -07:00
parent db5a7d4be2
commit f9abb397f3
1 changed files with 21 additions and 16 deletions
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src/font_cache/font_cache.c
+21 -16
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@@ -685,7 +685,11 @@ f_push_run_from_string(Arena *arena, F_Tag tag, F32 size, F32 base_align_px, F32
}
// rjf: call into font provider to rasterize this substring
FP_RasterResult raster = fp_raster(scratch.arena, font_handle, floor_f32(size), (flags & F_RunFlag_Smooth) ? FP_RasterMode_Smooth : FP_RasterMode_Sharp, piece_substring);
FP_RasterResult raster = {0};
if(size > 0)
{
raster = fp_raster(scratch.arena, font_handle, floor_f32(size), (flags & F_RunFlag_Smooth) ? FP_RasterMode_Smooth : FP_RasterMode_Sharp, piece_substring);
}
// rjf: allocate portion of an atlas to upload the rasterization
S16 chosen_atlas_num = 0;
@@ -816,6 +820,7 @@ f_push_run_from_string(Arena *arena, F_Tag tag, F32 size, F32 base_align_px, F32
dim.x += piece->advance;
dim.y = Max(dim.y, info->raster_dim.y);
last_piece_end_pad = ((F32)piece->offset.x+(F32)dim_2s16(info->bounding_box).x) - piece->advance;
last_piece_end_pad = ClampBot(0, last_piece_end_pad);
}
}
}
@@ -993,29 +998,29 @@ f_column_size_from_tag_size(F_Tag tag, F32 size)
internal U64
f_char_pos_from_tag_size_string_p(F_Tag tag, F32 size, F32 base_align_px, F32 tab_size_px, String8 string, F32 p)
{
ProfBeginFunction();
Temp scratch = scratch_begin(0, 0);
U64 result = 0;
U64 best_offset = 0;
F32 best_distance = -1.f;
F32 x = 0;
for(U64 char_idx = 0; char_idx <= string.size; char_idx += 1)
U64 best_offset_bytes = 0;
F32 best_offset_px = inf32();
U64 offset_bytes = 0;
F32 offset_px = 0.f;
F_Run run = f_push_run_from_string(scratch.arena, tag, size, base_align_px, tab_size_px, 0, string);
for(U64 idx = 0; idx <= run.pieces.count; idx += 1)
{
F32 this_char_distance = abs_f32(p - x);
if(this_char_distance < best_distance || best_distance < 0.f)
F32 this_piece_offset_px = abs_f32(offset_px - p);
if(this_piece_offset_px < best_offset_px)
{
best_offset = char_idx;
best_distance = this_char_distance;
best_offset_bytes = offset_bytes;
best_offset_px = this_piece_offset_px;
}
if(char_idx < string.size)
if(idx < run.pieces.count)
{
x += f_dim_from_tag_size_string(tag, size, base_align_px, tab_size_px, str8_substr(string, r1u64(char_idx, char_idx+1))).x;
F_Piece *piece = &run.pieces.v[idx];
offset_px += piece->advance;
offset_bytes += piece->decode_size;
}
}
result = best_offset;
scratch_end(scratch);
ProfEnd();
return result;
return best_offset_bytes;
}
////////////////////////////////