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ImFontAtlas: Added 'bool TexPixelsUseColors' output to help backend decide of underlying texture format. (#3369, #3844)

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ocornut
2021-03-02 14:08:36 +01:00
parent cdf1926f21
commit 23ab4978e4
5 changed files with 23 additions and 14 deletions
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10
misc/freetype/imgui_freetype.cpp
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@ -6,6 +6,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2021/03/02: set 'atlas->TexPixelsUseColors = true' to help some backends with deciding of a prefered texture format.
// 2021/01/28: added support for color-layered glyphs via ImGuiFreeTypeBuilderFlags_LoadColor (require Freetype 2.10+).
// 2021/01/26: simplified integration by using '#define IMGUI_ENABLE_FREETYPE'.
// renamed ImGuiFreeType::XXX flags to ImGuiFreeTypeBuilderFlags_XXX for consistency with other API. removed ImGuiFreeType::BuildFontAtlas().
@ -105,7 +106,7 @@ namespace
FT_Int OffsetX; // The distance from the origin ("pen position") to the left of the glyph.
FT_Int OffsetY; // The distance from the origin to the top of the glyph. This is usually a value < 0.
float AdvanceX; // The distance from the origin to the origin of the next glyph. This is usually a value > 0.
bool IsColored;
bool IsColored; // The glyph is colored
};
// Font parameters and metrics.
@ -605,6 +606,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
// 8. Copy rasterized font characters back into the main texture
// 9. Setup ImFont and glyphs for runtime
bool tex_use_colors = false;
for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
{
ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
@ -668,13 +670,15 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
float v1 = (ty + info.Height) / (float)atlas->TexHeight;
dst_font->AddGlyph(&cfg, (ImWchar)src_glyph.Codepoint, x0, y0, x1, y1, u0, v0, u1, v1, info.AdvanceX);
IM_ASSERT(dst_font->Glyphs.back().Codepoint == src_glyph.Codepoint);
ImFontGlyph* dst_glyph = &dst_font->Glyphs.back();
IM_ASSERT(dst_glyph->Codepoint == src_glyph.Codepoint);
if (src_glyph.Info.IsColored)
dst_font->Glyphs.back().Colored = true;
dst_glyph->Colored = tex_use_colors = true;
}
src_tmp.Rects = NULL;
}
atlas->TexPixelsUseColors = tex_use_colors;
// Cleanup
for (int buf_i = 0; buf_i < buf_bitmap_buffers.Size; buf_i++)