Reduce shape cache reserve length, possible improvemnet in positioning in draw_text_batch, shape_text_uncached

VEFontCache/VEFontCache.odin

@@ -1,11 +1,7 @@
 /*
 A port of (https://github.com/hypernewbie/VEFontCache) to Odin.
 
-Changes:
-- Font Parser & Glyph Shaper are abstracted to their own interface
-- Font Face parser info stored separately from entries
-- ve_fontcache_loadfile not ported (just use odin's core:os or os2), then call load_font
-- Macro defines have been made (mostly) into runtime parameters
+See: https://github.com/Ed94/VEFontCache-Odin
 */
 package VEFontCache
 
@@ -130,7 +126,7 @@ InitShapeCacheParams :: struct {
 
 InitShapeCacheParams_Default :: InitShapeCacheParams {
 	capacity       =  8 * 1024,
-	reserve_length =  1 * 1024,
+	reserve_length =  256,
 }
 
 // ve_fontcache_init

VEFontCache/draw.odin

@@ -29,6 +29,7 @@ DrawList :: struct {
 	calls    : [dynamic]DrawCall,
 }
 
+// TODO(Ed): This was a rough translation of the raw values the orignal was using, need to give better names...
 FrameBufferPass :: enum u32 {
 	None            = 0,
 	Glyph           = 1,
@@ -489,8 +490,8 @@ draw_text_batch :: proc(ctx: ^Context, entry: ^Entry, shaped: ^ShapedText,
 			// Draw cacxhed glyph
 			slot_position, _ := atlas_bbox( atlas, region_kind, atlas_index )
 			glyph_scale      := bounds_size * entry.size_scale + glyph_padding
-			bounds_0_scaled  := ceil( vbounds_0 * entry.size_scale )
-			dst              := glyph_translate + (bounds_0_scaled - glyph_padding) * scale
+			bounds_0_scaled  := ceil(vbounds_0 * entry.size_scale)
+			dst              := glyph_translate + bounds_0_scaled * scale
 			dst_scale        := glyph_scale * scale
 			textspace_x_form( & slot_position, & glyph_scale, atlas_size )
 

VEFontCache/shaped_text.odin

@@ -111,7 +111,7 @@ shape_text_uncached :: proc( ctx : ^Context, font : FontID, text_utf8 : string,
 				continue
 			}
 			if abs( entry.size ) <= Advance_Snap_Smallfont_Size {
-				position.x = ceil( position.x )
+				position.x = position.x
 			}
 
 			append( & output.glyphs, parser_find_glyph_index( & entry.parser_info, codepoint ))
@@ -122,14 +122,14 @@ shape_text_uncached :: proc( ctx : ^Context, font : FontID, text_utf8 : string,
 				position.y
 			})
 
-			position.x    += f32(advance) * entry.size_scale
+			position.x    += ceil(f32(advance) * entry.size_scale)
 			prev_codepoint = codepoint
 		}
 
 		output.end_cursor_pos = position
 		max_line_width        = max(max_line_width, position.x)
 
-		output.size.x = max_line_width
+		output.size.x = ceil(max_line_width)
 		output.size.y = f32(line_count) * line_height
 	}
 }