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ImFontAtlas: some more optimisations / cleanup.

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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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78
imgui.cpp
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@ -6297,17 +6297,18 @@ void ImDrawList::AddImage(ImTextureID user_texture_id, const ImVec2& a, const Im
struct ImFontAtlas::ImFontAtlasData struct ImFontAtlas::ImFontAtlasData
{ {
// Input // Input
ImFont* OutFont; // Load into this font ImFont* OutFont; // Load into this font
void* TTFData; // TTF data, we own the memory void* TTFData; // TTF data, we own the memory
size_t TTFDataSize; // TTF data size, in bytes size_t TTFDataSize; // TTF data size, in bytes
float SizePixels; // Desired output size, in pixels float SizePixels; // Desired output size, in pixels
const ImWchar* GlyphRanges; // List of Unicode range (2 value per range, values are inclusive, zero-terminated list) const ImWchar* GlyphRanges; // List of Unicode range (2 value per range, values are inclusive, zero-terminated list)
int FontNo; // Index of font within .TTF file (0) int FontNo; // Index of font within .TTF file (0)
// Temporary Build Data // Temporary Build Data
stbtt_fontinfo FontInfo; stbtt_fontinfo FontInfo;
stbrp_rect* Rects; stbrp_rect* Rects;
ImVector<stbtt_pack_range> Ranges; stbtt_pack_range* Ranges;
int RangesCount;
}; };
ImFontAtlas::ImFontAtlas() ImFontAtlas::ImFontAtlas()
@ -6468,6 +6469,7 @@ bool ImFontAtlas::Build()
// Initialize font information early (so we can error without any cleanup) + count glyphs // Initialize font information early (so we can error without any cleanup) + count glyphs
int total_glyph_count = 0; int total_glyph_count = 0;
int total_glyph_range_count = 0;
for (size_t input_i = 0; input_i < InputData.size(); input_i++) for (size_t input_i = 0; input_i < InputData.size(); input_i++)
{ {
ImFontAtlasData& data = *InputData[input_i]; ImFontAtlasData& data = *InputData[input_i];
@ -6480,7 +6482,10 @@ bool ImFontAtlas::Build()
if (!data.GlyphRanges) if (!data.GlyphRanges)
data.GlyphRanges = GetGlyphRangesDefault(); data.GlyphRanges = GetGlyphRangesDefault();
for (const ImWchar* in_range = data.GlyphRanges; in_range[0] && in_range[1]; in_range += 2) 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_count += (in_range[1] - in_range[0]) + 1;
total_glyph_range_count++;
}
} }
// Start packing // Start packing
@ -6499,13 +6504,13 @@ bool ImFontAtlas::Build()
stbrp_pack_rects((stbrp_context*)spc.pack_info, &extra_rect, 1); stbrp_pack_rects((stbrp_context*)spc.pack_info, &extra_rect, 1);
TexExtraDataPos = ImVec2(extra_rect.x, extra_rect.y); TexExtraDataPos = ImVec2(extra_rect.x, extra_rect.y);
// Allocate packing character data and flag as non-packed (x0=y0=x1=y1=0) // Allocate packing character data and flag packed characters buffer as non-packed (x0=y0=x1=y1=0)
stbtt_packedchar* packed_chardata = (stbtt_packedchar*)ImGui::MemAlloc(total_glyph_count * sizeof(stbtt_packedchar)); int buf_packedchars_n = 0, buf_rects_n = 0, buf_ranges_n = 0;
int packed_chardata_n = 0; stbtt_packedchar* buf_packedchars = (stbtt_packedchar*)ImGui::MemAlloc(total_glyph_count * sizeof(stbtt_packedchar));
memset(packed_chardata, 0, 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));
stbrp_rect* rectdata = (stbrp_rect*)ImGui::MemAlloc(total_glyph_count * sizeof(stbrp_rect)); memset(buf_packedchars, 0, total_glyph_count * sizeof(stbtt_packedchar));
int rectdata_n = 0; 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) // 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; 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_count += (in_range[1] - in_range[0]) + 1;
glyph_ranges_count++; glyph_ranges_count++;
} }
data.Ranges.resize(glyph_ranges_count); data.Ranges = buf_ranges + buf_ranges_n;
for (size_t i = 0; i < data.Ranges.size(); i++) 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]; stbtt_pack_range& range = data.Ranges[i];
range.font_size = data.SizePixels; range.font_size = data.SizePixels;
const ImWchar* in_range = &data.GlyphRanges[i * 2];
range.first_unicode_char_in_range = in_range[0]; range.first_unicode_char_in_range = in_range[0];
range.num_chars_in_range = (in_range[1] - in_range[0]) + 1; range.num_chars_in_range = (in_range[1] - in_range[0]) + 1;
range.chardata_for_range = packed_chardata + packed_chardata_n; range.chardata_for_range = buf_packedchars + buf_packedchars_n;
packed_chardata_n += range.num_chars_in_range; buf_packedchars_n += range.num_chars_in_range;
} }
// Pack // Pack
data.Rects = rectdata + rectdata_n; data.Rects = buf_rects + buf_rects_n;
rectdata_n += glyph_count; buf_rects_n += glyph_count;
const int n = stbtt_PackFontRangesGatherRects(&spc, &data.FontInfo, data.Ranges.begin(), data.Ranges.size(), data.Rects); 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); stbrp_pack_rects((stbrp_context*)spc.pack_info, data.Rects, n);
// Extend texture height // Extend texture height
@ -6544,11 +6551,13 @@ bool ImFontAtlas::Build()
if (data.Rects[i].was_packed) if (data.Rects[i].was_packed)
tex_height = ImMax(tex_height, data.Rects[i].y + data.Rects[i].h); 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 // Create texture
TexHeight = ImUpperPowerOfTwo(tex_height); TexHeight = ImUpperPowerOfTwo(tex_height);
TexPixelsAlpha8 = (unsigned char*)ImGui::MemRealloc(TexPixelsAlpha8, TexWidth * TexHeight); TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(TexWidth * TexHeight);
memset(TexPixelsAlpha8, 0, TexWidth * TexHeight); memset(TexPixelsAlpha8, 0, TexWidth * TexHeight);
spc.pixels = TexPixelsAlpha8; spc.pixels = TexPixelsAlpha8;
spc.height = TexHeight; spc.height = TexHeight;
@ -6557,14 +6566,14 @@ bool ImFontAtlas::Build()
for (size_t input_i = 0; input_i < InputData.size(); input_i++) for (size_t input_i = 0; input_i < InputData.size(); input_i++)
{ {
ImFontAtlasData& data = *InputData[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; data.Rects = NULL;
} }
// End packing // End packing
stbtt_PackEnd(&spc); stbtt_PackEnd(&spc);
ImGui::MemFree(rectdata); ImGui::MemFree(buf_rects);
rectdata = NULL; buf_rects = NULL;
// Third pass: setup ImFont and glyphs for runtime // Third pass: setup ImFont and glyphs for runtime
for (size_t input_i = 0; input_i < InputData.size(); input_i++) 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_x = 1.0f / TexWidth;
const float uv_scale_y = 1.0f / TexHeight; const float uv_scale_y = 1.0f / TexHeight;
const int character_spacing_x = 1; 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]; stbtt_pack_range& range = data.Ranges[i];
for (int char_idx = 0; char_idx < range.num_chars_in_range; char_idx += 1) 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(); data.OutFont->BuildLookupTable();
// Cleanup temporaries
data.Ranges.clear();
} }
// Cleanup temporaries // Cleanup temporaries
ImGui::MemFree(buf_packedchars);
ImGui::MemFree(buf_ranges);
buf_packedchars = NULL;
buf_ranges = NULL;
ClearInputData(); ClearInputData();
ImGui::MemFree(packed_chardata);
packed_chardata = NULL;
// Draw white pixel into texture and make UV points to it // Draw white pixel into texture and make UV points to it
TexPixelsAlpha8[0] = TexPixelsAlpha8[1] = TexPixelsAlpha8[TexWidth+0] = TexPixelsAlpha8[TexWidth+1] = 0xFF; TexPixelsAlpha8[0] = TexPixelsAlpha8[1] = TexPixelsAlpha8[TexWidth+0] = TexPixelsAlpha8[TexWidth+1] = 0xFF;