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ImFontAtlas: some more optimisations / cleanup.

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This commit is contained in:
ocornut 2015-01-18 12:12:16 +00:00
parent e685e49781
commit bfe894406d
1 changed files with 43 additions and 35 deletions
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62
imgui.cpp
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@ -6307,7 +6307,8 @@ struct ImFontAtlas::ImFontAtlasData
// Temporary Build Data
stbtt_fontinfo FontInfo;
stbrp_rect* Rects;
ImVector<stbtt_pack_range> Ranges;
stbtt_pack_range* Ranges;
int RangesCount;
};
ImFontAtlas::ImFontAtlas()
@ -6468,6 +6469,7 @@ bool ImFontAtlas::Build()
// Initialize font information early (so we can error without any cleanup) + count glyphs
int total_glyph_count = 0;
int total_glyph_range_count = 0;
for (size_t input_i = 0; input_i < InputData.size(); input_i++)
{
ImFontAtlasData& data = *InputData[input_i];
@ -6480,7 +6482,10 @@ bool ImFontAtlas::Build()
if (!data.GlyphRanges)
data.GlyphRanges = GetGlyphRangesDefault();
for (const ImWchar* in_range = data.GlyphRanges; in_range[0] && in_range[1]; in_range += 2)
{
total_glyph_count += (in_range[1] - in_range[0]) + 1;
total_glyph_range_count++;
}
}
// Start packing
@ -6499,13 +6504,13 @@ bool ImFontAtlas::Build()
stbrp_pack_rects((stbrp_context*)spc.pack_info, &extra_rect, 1);
TexExtraDataPos = ImVec2(extra_rect.x, extra_rect.y);
// Allocate packing character data and flag as non-packed (x0=y0=x1=y1=0)
stbtt_packedchar* packed_chardata = (stbtt_packedchar*)ImGui::MemAlloc(total_glyph_count * sizeof(stbtt_packedchar));
int packed_chardata_n = 0;
memset(packed_chardata, 0, total_glyph_count * sizeof(stbtt_packedchar));
stbrp_rect* rectdata = (stbrp_rect*)ImGui::MemAlloc(total_glyph_count * sizeof(stbrp_rect));
int rectdata_n = 0;
// Allocate packing character data and flag packed characters buffer as non-packed (x0=y0=x1=y1=0)
int buf_packedchars_n = 0, buf_rects_n = 0, buf_ranges_n = 0;
stbtt_packedchar* buf_packedchars = (stbtt_packedchar*)ImGui::MemAlloc(total_glyph_count * sizeof(stbtt_packedchar));
stbrp_rect* buf_rects = (stbrp_rect*)ImGui::MemAlloc(total_glyph_count * sizeof(stbrp_rect));
stbtt_pack_range* buf_ranges = (stbtt_pack_range*)ImGui::MemAlloc(total_glyph_range_count * sizeof(stbtt_pack_range));
memset(buf_packedchars, 0, total_glyph_count * sizeof(stbtt_packedchar));
memset(buf_ranges, 0, total_glyph_range_count * sizeof(stbtt_pack_range));
// First pass: pack all glyphs (no rendering at this point, we are working with glyph sizes only)
int tex_height = extra_rect.y + extra_rect.h;
@ -6521,22 +6526,24 @@ bool ImFontAtlas::Build()
glyph_count += (in_range[1] - in_range[0]) + 1;
glyph_ranges_count++;
}
data.Ranges.resize(glyph_ranges_count);
for (size_t i = 0; i < data.Ranges.size(); i++)
data.Ranges = buf_ranges + buf_ranges_n;
data.RangesCount = glyph_ranges_count;
buf_ranges_n += glyph_ranges_count;
for (size_t i = 0; i < glyph_ranges_count; i++)
{
const ImWchar* in_range = &data.GlyphRanges[i * 2];
stbtt_pack_range& range = data.Ranges[i];
range.font_size = data.SizePixels;
const ImWchar* in_range = &data.GlyphRanges[i * 2];
range.first_unicode_char_in_range = in_range[0];
range.num_chars_in_range = (in_range[1] - in_range[0]) + 1;
range.chardata_for_range = packed_chardata + packed_chardata_n;
packed_chardata_n += range.num_chars_in_range;
range.chardata_for_range = buf_packedchars + buf_packedchars_n;
buf_packedchars_n += range.num_chars_in_range;
}
// Pack
data.Rects = rectdata + rectdata_n;
rectdata_n += glyph_count;
const int n = stbtt_PackFontRangesGatherRects(&spc, &data.FontInfo, data.Ranges.begin(), data.Ranges.size(), data.Rects);
data.Rects = buf_rects + buf_rects_n;
buf_rects_n += glyph_count;
const int n = stbtt_PackFontRangesGatherRects(&spc, &data.FontInfo, data.Ranges, data.RangesCount, data.Rects);
stbrp_pack_rects((stbrp_context*)spc.pack_info, data.Rects, n);
// Extend texture height
@ -6544,11 +6551,13 @@ bool ImFontAtlas::Build()
if (data.Rects[i].was_packed)
tex_height = ImMax(tex_height, data.Rects[i].y + data.Rects[i].h);
}
IM_ASSERT(packed_chardata_n == total_glyph_count);
IM_ASSERT(buf_rects_n == total_glyph_count);
IM_ASSERT(buf_packedchars_n == total_glyph_count);
IM_ASSERT(buf_ranges_n == total_glyph_range_count);
// Create texture
TexHeight = ImUpperPowerOfTwo(tex_height);
TexPixelsAlpha8 = (unsigned char*)ImGui::MemRealloc(TexPixelsAlpha8, TexWidth * TexHeight);
TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(TexWidth * TexHeight);
memset(TexPixelsAlpha8, 0, TexWidth * TexHeight);
spc.pixels = TexPixelsAlpha8;
spc.height = TexHeight;
@ -6557,14 +6566,14 @@ bool ImFontAtlas::Build()
for (size_t input_i = 0; input_i < InputData.size(); input_i++)
{
ImFontAtlasData& data = *InputData[input_i];
ret = stbtt_PackFontRangesRenderIntoRects(&spc, &data.FontInfo, data.Ranges.begin(), data.Ranges.size(), data.Rects);
ret = stbtt_PackFontRangesRenderIntoRects(&spc, &data.FontInfo, data.Ranges, data.RangesCount, data.Rects);
data.Rects = NULL;
}
// End packing
stbtt_PackEnd(&spc);
ImGui::MemFree(rectdata);
rectdata = NULL;
ImGui::MemFree(buf_rects);
buf_rects = NULL;
// Third pass: setup ImFont and glyphs for runtime
for (size_t input_i = 0; input_i < InputData.size(); input_i++)
@ -6580,7 +6589,7 @@ bool ImFontAtlas::Build()
const float uv_scale_x = 1.0f / TexWidth;
const float uv_scale_y = 1.0f / TexHeight;
const int character_spacing_x = 1;
for (size_t i = 0; i < data.Ranges.size(); i++)
for (int i = 0; i < data.RangesCount; i++)
{
stbtt_pack_range& range = data.Ranges[i];
for (int char_idx = 0; char_idx < range.num_chars_in_range; char_idx += 1)
@ -6606,15 +6615,14 @@ bool ImFontAtlas::Build()
}
data.OutFont->BuildLookupTable();
// Cleanup temporaries
data.Ranges.clear();
}
// Cleanup temporaries
ImGui::MemFree(buf_packedchars);
ImGui::MemFree(buf_ranges);
buf_packedchars = NULL;
buf_ranges = NULL;
ClearInputData();
ImGui::MemFree(packed_chardata);
packed_chardata = NULL;
// Draw white pixel into texture and make UV points to it
TexPixelsAlpha8[0] = TexPixelsAlpha8[1] = TexPixelsAlpha8[TexWidth+0] = TexPixelsAlpha8[TexWidth+1] = 0xFF;