mirror of https://github.com/ocornut/imgui
ImFontAtlas: Re-arranging code to simplify implementation of imgui_freetype. (#618)
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1086c87767
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@ -1336,40 +1336,45 @@ void ImFontAtlas::CustomRectCalcUV(const CustomRect* rect, ImVec2* out_uv_min, I
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bool ImFontAtlas::Build()
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{
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IM_ASSERT(ConfigData.Size > 0);
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return ImFontAtlasBuildWithStbTruetype(this);
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}
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ImFontAtlasBuildRegisterDefaultCustomRects(this);
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bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
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{
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IM_ASSERT(atlas->ConfigData.Size > 0);
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TexID = NULL;
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TexWidth = TexHeight = 0;
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TexUvWhitePixel = ImVec2(0, 0);
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ClearTexData();
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ImFontAtlasBuildRegisterDefaultCustomRects(atlas);
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atlas->TexID = NULL;
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atlas->TexWidth = atlas->TexHeight = 0;
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atlas->TexUvWhitePixel = ImVec2(0, 0);
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atlas->ClearTexData();
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// Count glyphs/ranges
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int total_glyphs_count = 0;
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int total_ranges_count = 0;
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for (int input_i = 0; input_i < ConfigData.Size; input_i++)
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for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
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{
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ImFontConfig& cfg = ConfigData[input_i];
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ImFontConfig& cfg = atlas->ConfigData[input_i];
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if (!cfg.GlyphRanges)
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cfg.GlyphRanges = GetGlyphRangesDefault();
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cfg.GlyphRanges = atlas->GetGlyphRangesDefault();
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for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2, total_ranges_count++)
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total_glyphs_count += (in_range[1] - in_range[0]) + 1;
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}
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// We need a width for the skyline algorithm. Using a dumb heuristic here to decide of width. User can override TexDesiredWidth and TexGlyphPadding if they wish.
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// Width doesn't really matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
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TexWidth = (TexDesiredWidth > 0) ? TexDesiredWidth : (total_glyphs_count > 4000) ? 4096 : (total_glyphs_count > 2000) ? 2048 : (total_glyphs_count > 1000) ? 1024 : 512;
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TexHeight = 0;
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atlas->TexWidth = (atlas->TexDesiredWidth > 0) ? atlas->TexDesiredWidth : (total_glyphs_count > 4000) ? 4096 : (total_glyphs_count > 2000) ? 2048 : (total_glyphs_count > 1000) ? 1024 : 512;
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atlas->TexHeight = 0;
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// Start packing
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const int max_tex_height = 1024*32;
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stbtt_pack_context spc;
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stbtt_PackBegin(&spc, NULL, TexWidth, max_tex_height, 0, TexGlyphPadding, NULL);
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stbtt_PackBegin(&spc, NULL, atlas->TexWidth, max_tex_height, 0, atlas->TexGlyphPadding, NULL);
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stbtt_PackSetOversampling(&spc, 1, 1);
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// Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
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ImFontAtlasBuildPackCustomRects(this, spc.pack_info);
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ImFontAtlasBuildPackCustomRects(atlas, spc.pack_info);
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// Initialize font information (so we can error without any cleanup)
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struct ImFontTempBuildData
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@ -1379,12 +1384,13 @@ bool ImFontAtlas::Build()
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stbtt_pack_range* Ranges;
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int RangesCount;
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};
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ImFontTempBuildData* tmp_array = (ImFontTempBuildData*)ImGui::MemAlloc((size_t)ConfigData.Size * sizeof(ImFontTempBuildData));
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for (int input_i = 0; input_i < ConfigData.Size; input_i++)
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ImFontTempBuildData* tmp_array = (ImFontTempBuildData*)ImGui::MemAlloc((size_t)atlas->ConfigData.Size * sizeof(ImFontTempBuildData));
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for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
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{
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ImFontConfig& cfg = ConfigData[input_i];
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ImFontConfig& cfg = atlas->ConfigData[input_i];
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ImFontTempBuildData& tmp = tmp_array[input_i];
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IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == this));
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IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == atlas));
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const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)cfg.FontData, cfg.FontNo);
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IM_ASSERT(font_offset >= 0);
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if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
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@ -1401,9 +1407,9 @@ bool ImFontAtlas::Build()
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memset(buf_ranges, 0, total_ranges_count * sizeof(stbtt_pack_range));
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// First font pass: pack all glyphs (no rendering at this point, we are working with rectangles in an infinitely tall texture at this point)
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for (int input_i = 0; input_i < ConfigData.Size; input_i++)
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for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
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{
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ImFontConfig& cfg = ConfigData[input_i];
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ImFontConfig& cfg = atlas->ConfigData[input_i];
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ImFontTempBuildData& tmp = tmp_array[input_i];
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// Setup ranges
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@ -1436,23 +1442,23 @@ bool ImFontAtlas::Build()
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// Extend texture height
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for (int i = 0; i < n; i++)
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if (tmp.Rects[i].was_packed)
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TexHeight = ImMax(TexHeight, tmp.Rects[i].y + tmp.Rects[i].h);
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atlas->TexHeight = ImMax(atlas->TexHeight, tmp.Rects[i].y + tmp.Rects[i].h);
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}
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IM_ASSERT(buf_rects_n == total_glyphs_count);
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IM_ASSERT(buf_packedchars_n == total_glyphs_count);
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IM_ASSERT(buf_ranges_n == total_ranges_count);
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// Create texture
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TexHeight = ImUpperPowerOfTwo(TexHeight);
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TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(TexWidth * TexHeight);
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memset(TexPixelsAlpha8, 0, TexWidth * TexHeight);
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spc.pixels = TexPixelsAlpha8;
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spc.height = TexHeight;
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atlas->TexHeight = ImUpperPowerOfTwo(atlas->TexHeight);
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atlas->TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(atlas->TexWidth * atlas->TexHeight);
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memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
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spc.pixels = atlas->TexPixelsAlpha8;
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spc.height = atlas->TexHeight;
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// Second pass: render font characters
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for (int input_i = 0; input_i < ConfigData.Size; input_i++)
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for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
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{
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ImFontConfig& cfg = ConfigData[input_i];
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ImFontConfig& cfg = atlas->ConfigData[input_i];
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ImFontTempBuildData& tmp = tmp_array[input_i];
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stbtt_PackSetOversampling(&spc, cfg.OversampleH, cfg.OversampleV);
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stbtt_PackFontRangesRenderIntoRects(&spc, &tmp.FontInfo, tmp.Ranges, tmp.RangesCount, tmp.Rects);
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@ -1465,9 +1471,9 @@ bool ImFontAtlas::Build()
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buf_rects = NULL;
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// Third pass: setup ImFont and glyphs for runtime
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for (int input_i = 0; input_i < ConfigData.Size; input_i++)
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for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
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{
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ImFontConfig& cfg = ConfigData[input_i];
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ImFontConfig& cfg = atlas->ConfigData[input_i];
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ImFontTempBuildData& tmp = tmp_array[input_i];
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ImFont* dst_font = cfg.DstFont; // We can have multiple input fonts writing into a same destination font (when using MergeMode=true)
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@ -1477,7 +1483,7 @@ bool ImFontAtlas::Build()
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float ascent = unscaled_ascent * font_scale;
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float descent = unscaled_descent * font_scale;
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ImFontAtlasBuildSetupFont(this, dst_font, &cfg, ascent, descent);
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ImFontAtlasBuildSetupFont(atlas, dst_font, &cfg, ascent, descent);
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float off_x = cfg.GlyphOffset.x;
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float off_y = cfg.GlyphOffset.y + (float)(int)(dst_font->Ascent + 0.5f);
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@ -1497,7 +1503,7 @@ bool ImFontAtlas::Build()
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stbtt_aligned_quad q;
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float dummy_x = 0.0f, dummy_y = 0.0f;
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stbtt_GetPackedQuad(range.chardata_for_range, TexWidth, TexHeight, char_idx, &dummy_x, &dummy_y, &q, 0);
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stbtt_GetPackedQuad(range.chardata_for_range, atlas->TexWidth, atlas->TexHeight, char_idx, &dummy_x, &dummy_y, &q, 0);
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dst_font->Glyphs.resize(dst_font->Glyphs.Size + 1);
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ImFont::Glyph& glyph = dst_font->Glyphs.back();
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@ -1514,7 +1520,7 @@ bool ImFontAtlas::Build()
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if (cfg.PixelSnapH)
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glyph.XAdvance = (float)(int)(glyph.XAdvance + 0.5f);
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dst_font->MetricsTotalSurface += (int)((glyph.U1 - glyph.U0) * TexWidth + 1.99f) * (int)((glyph.V1 - glyph.V0) * TexHeight + 1.99f); // +1 to account for average padding, +0.99 to round
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dst_font->MetricsTotalSurface += (int)((glyph.U1 - glyph.U0) * atlas->TexWidth + 1.99f) * (int)((glyph.V1 - glyph.V0) * atlas->TexHeight + 1.99f); // +1 to account for average padding, +0.99 to round
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}
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}
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cfg.DstFont->BuildLookupTable();
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@ -1526,7 +1532,7 @@ bool ImFontAtlas::Build()
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ImGui::MemFree(tmp_array);
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// Render into our custom data block
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ImFontAtlasBuildRenderDefaultTexData(this);
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ImFontAtlasBuildRenderDefaultTexData(atlas);
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return true;
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}
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@ -793,6 +793,7 @@ namespace ImGui
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} // namespace ImGui
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// ImFontAtlas internals
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IMGUI_API bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas);
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IMGUI_API void ImFontAtlasBuildRegisterDefaultCustomRects(ImFontAtlas* atlas);
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IMGUI_API void ImFontAtlasBuildSetupFont(ImFontAtlas* atlas, ImFont* font, ImFontConfig* font_config, float ascent, float descent);
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IMGUI_API void ImFontAtlasBuildPackCustomRects(ImFontAtlas* atlas, void* spc);
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