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Fonts: rework ImFontLoader::FontBakedLoadGlyph() interface

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ocornut
2025-05-08 17:03:52 +02:00
parent 4dec946ae6
commit 8523cbdf58
3 changed files with 36 additions and 46 deletions
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42
imgui_draw.cpp
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@@ -4393,12 +4393,15 @@ static ImFontGlyph* ImFontBaked_BuildLoadGlyph(ImFontBaked* baked, ImWchar codep
{
const ImFontLoader* loader = src->FontLoader ? src->FontLoader : atlas->FontLoader;
if (!src->GlyphExcludeRanges || ImFontAtlasBuildAcceptCodepointForSource(src, codepoint))
if (ImFontGlyph* glyph = loader->FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint))
{
ImFontGlyph glyph_buf;
if (loader->FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint, &glyph_buf))
{
// FIXME: Add hooks for e.g. #7962
glyph->SourceIdx = src_n;
return glyph;
glyph_buf.SourceIdx = src_n;
return ImFontAtlasBakedAddFontGlyph(atlas, baked, src, &glyph_buf);
}
}
loader_user_data_p += loader->FontBakedSrcLoaderDataSize;
src_n++;
}
@@ -4539,14 +4542,14 @@ static bool ImGui_ImplStbTrueType_FontBakedInit(ImFontAtlas* atlas, ImFontConfig
return true;
}
static ImFontGlyph* ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void*, ImWchar codepoint)
static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void*, ImWchar codepoint, ImFontGlyph* out_glyph)
{
// Search for first font which has the glyph
ImGui_ImplStbTrueType_FontSrcData* bd_font_data = (ImGui_ImplStbTrueType_FontSrcData*)src->FontLoaderData;
IM_ASSERT(bd_font_data);
int glyph_index = stbtt_FindGlyphIndex(&bd_font_data->FontInfo, (int)codepoint);
if (glyph_index == 0)
return NULL;
return false;
// Fonts unit to pixels
int oversample_h, oversample_v;
@@ -4564,10 +4567,8 @@ static ImFontGlyph* ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas,
const bool is_visible = (x0 != x1 && y0 != y1);
// Prepare glyph
ImFontGlyph glyph_in = {};
ImFontGlyph* glyph = &glyph_in;
glyph->Codepoint = codepoint;
glyph->AdvanceX = advance * scale_for_layout;
out_glyph->Codepoint = codepoint;
out_glyph->AdvanceX = advance * scale_for_layout;
// Pack and retrieve position inside texture atlas
// (generally based on stbtt_PackFontRangesRenderIntoRects)
@@ -4580,7 +4581,7 @@ static ImFontGlyph* ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas,
{
// Pathological out of memory case (TexMaxWidth/TexMaxHeight set too small?)
IM_ASSERT(pack_id != ImFontAtlasRectId_Invalid && "Out of texture memory.");
return NULL;
return false;
}
ImTextureRect* r = ImFontAtlasPackGetRect(atlas, pack_id);
@@ -4615,21 +4616,16 @@ static ImFontGlyph* ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas,
// Register glyph
// r->x r->y are coordinates inside texture (in pixels)
// glyph.X0, glyph.Y0 are drawing coordinates from base text position, and accounting for oversampling.
glyph->X0 = x0 * recip_h + font_off_x;
glyph->Y0 = y0 * recip_v + font_off_y;
glyph->X1 = (x0 + (int)r->w) * recip_h + font_off_x;
glyph->Y1 = (y0 + (int)r->h) * recip_v + font_off_y;
glyph->Visible = true;
glyph->PackId = pack_id;
glyph = ImFontAtlasBakedAddFontGlyph(atlas, baked, src, glyph);
ImFontAtlasBakedSetFontGlyphBitmap(atlas, baked, src, glyph, r, bitmap_pixels, ImTextureFormat_Alpha8, w);
}
else
{
glyph = ImFontAtlasBakedAddFontGlyph(atlas, baked, src, glyph);
out_glyph->X0 = x0 * recip_h + font_off_x;
out_glyph->Y0 = y0 * recip_v + font_off_y;
out_glyph->X1 = (x0 + (int)r->w) * recip_h + font_off_x;
out_glyph->Y1 = (y0 + (int)r->h) * recip_v + font_off_y;
out_glyph->Visible = true;
out_glyph->PackId = pack_id;
ImFontAtlasBakedSetFontGlyphBitmap(atlas, baked, src, out_glyph, r, bitmap_pixels, ImTextureFormat_Alpha8, w);
}
return glyph;
return true;
}
const ImFontLoader* ImFontAtlasGetFontLoaderForStbTruetype()

4
imgui_internal.h
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@@ -3669,7 +3669,7 @@ namespace ImGui
// Hooks and storage for a given font backend.
// This structure is likely to evolve as we add support for incremental atlas updates.
// Conceptually this could be in ImGuiPlatformIO, but we are far from ready to make this public.
// Conceptually this could be public, but API is still going to be evolve.
struct ImFontLoader
{
const char* Name;
@@ -3680,7 +3680,7 @@ struct ImFontLoader
bool (*FontSrcContainsGlyph)(ImFontAtlas* atlas, ImFontConfig* src, ImWchar codepoint);
bool (*FontBakedInit)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src);
void (*FontBakedDestroy)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src);
ImFontGlyph* (*FontBakedLoadGlyph)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint);
bool (*FontBakedLoadGlyph)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint, ImFontGlyph* out_glyph);
// Size of backend data, Per Baked * Per Source. Buffers are managed by core to avoid excessive allocations.
// FIXME: At this point the two other types of buffers may be managed by core to be consistent?

36
misc/freetype/imgui_freetype.cpp
View File

@@ -473,12 +473,12 @@ void ImGui_ImplFreeType_FontBakedDestroy(ImFontAtlas* atlas, ImFontConfig* src,
bd_baked_data->~ImGui_ImplFreeType_FontSrcBakedData(); // ~IM_PLACEMENT_DELETE()
}
ImFontGlyph* ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint)
bool ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint, ImFontGlyph* out_glyph)
{
ImGui_ImplFreeType_FontSrcData* bd_font_data = (ImGui_ImplFreeType_FontSrcData*)src->FontLoaderData;
uint32_t glyph_index = FT_Get_Char_Index(bd_font_data->FtFace, codepoint);
if (glyph_index == 0)
return NULL;
return false;
if (bd_font_data->BakedLastActivated != baked) // <-- could use id
{
@@ -490,7 +490,7 @@ ImFontGlyph* ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontCon
const FT_Glyph_Metrics* metrics = ImGui_ImplFreeType_LoadGlyph(bd_font_data, codepoint);
if (metrics == NULL)
return NULL;
return false;
// Render glyph into a bitmap (currently held by FreeType)
FT_Face face = bd_font_data->FtFace;
@@ -507,10 +507,8 @@ ImFontGlyph* ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontCon
const float rasterizer_density = src->RasterizerDensity * baked->RasterizerDensity;
// Prepare glyph
ImFontGlyph glyph_in = {};
ImFontGlyph* glyph = &glyph_in;
glyph->Codepoint = codepoint;
glyph->AdvanceX = (slot->advance.x / FT_SCALEFACTOR) / rasterizer_density;
out_glyph->Codepoint = codepoint;
out_glyph->AdvanceX = (slot->advance.x / FT_SCALEFACTOR) / rasterizer_density;
// Pack and retrieve position inside texture atlas
if (is_visible)
@@ -542,21 +540,17 @@ ImFontGlyph* ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontCon
// Register glyph
float glyph_off_x = (float)face->glyph->bitmap_left;
float glyph_off_y = (float)-face->glyph->bitmap_top;
glyph->X0 = glyph_off_x * recip_h + font_off_x;
glyph->Y0 = glyph_off_y * recip_v + font_off_y;
glyph->X1 = (glyph_off_x + w) * recip_h + font_off_x;
glyph->Y1 = (glyph_off_y + h) * recip_v + font_off_y;
glyph->Visible = true;
glyph->Colored = (ft_bitmap->pixel_mode == FT_PIXEL_MODE_BGRA);
glyph->PackId = pack_id;
glyph = ImFontAtlasBakedAddFontGlyph(atlas, baked, src, glyph);
ImFontAtlasBakedSetFontGlyphBitmap(atlas, baked, src, glyph, r, (const unsigned char*)temp_buffer, ImTextureFormat_RGBA32, w * 4);
out_glyph->X0 = glyph_off_x * recip_h + font_off_x;
out_glyph->Y0 = glyph_off_y * recip_v + font_off_y;
out_glyph->X1 = (glyph_off_x + w) * recip_h + font_off_x;
out_glyph->Y1 = (glyph_off_y + h) * recip_v + font_off_y;
out_glyph->Visible = true;
out_glyph->Colored = (ft_bitmap->pixel_mode == FT_PIXEL_MODE_BGRA);
out_glyph->PackId = pack_id;
ImFontAtlasBakedSetFontGlyphBitmap(atlas, baked, src, out_glyph, r, (const unsigned char*)temp_buffer, ImTextureFormat_RGBA32, w * 4);
}
else
{
glyph = ImFontAtlasBakedAddFontGlyph(atlas, baked, src, glyph);
}
return glyph;
return true;
}
bool ImGui_ImplFreetype_FontSrcContainsGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImWchar codepoint)