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ImFontAtlas: Shuffling some code inside Build() to make upcoming diffs less confusing (nb: we might break compat with forks of Build() like #618)

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This commit is contained in:
omar 2017-08-16 18:56:26 +08:00
parent 34d09f2dc8
commit 0be4f66d89
2 changed files with 31 additions and 30 deletions
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1
TODO.txt
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@ -24,6 +24,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
- window: increase minimum size of a window with menus or fix the menu rendering so that it doesn't look odd.
- window: double-clicking on title bar to minimize isn't consistent, perhaps move to single-click on left-most collapse icon?
- window: expose contents size. (#1045)
- window: GetWindowSize() returns (0,0) when not calculated? (#1045)
!- scrolling: allow immediately effective change of scroll after Begin() if we haven't appended items yet.
- scrolling/clipping: separator on the initial position of a window is not visible (cursorpos.y <= clippos.y)

60
imgui_draw.cpp
View File

@ -1034,7 +1034,7 @@ void ImDrawData::ScaleClipRects(const ImVec2& scale)
}
//-----------------------------------------------------------------------------
// ImFontAtlas
// ImFontConfig
//-----------------------------------------------------------------------------
ImFontConfig::ImFontConfig()
@ -1055,6 +1055,10 @@ ImFontConfig::ImFontConfig()
memset(Name, 0, sizeof(Name));
}
//-----------------------------------------------------------------------------
// ImFontAtlas
//-----------------------------------------------------------------------------
ImFontAtlas::ImFontAtlas()
{
TexID = NULL;
@ -1282,40 +1286,19 @@ bool ImFontAtlas::Build()
TexUvWhitePixel = ImVec2(0, 0);
ClearTexData();
struct ImFontTempBuildData
{
stbtt_fontinfo FontInfo;
stbrp_rect* Rects;
stbtt_pack_range* Ranges;
int RangesCount;
};
ImFontTempBuildData* tmp_array = (ImFontTempBuildData*)ImGui::MemAlloc((size_t)ConfigData.Size * sizeof(ImFontTempBuildData));
// Initialize font information early (so we can error without any cleanup) + count glyphs
// Count glyphs/ranges
int total_glyph_count = 0;
int total_glyph_range_count = 0;
for (int input_i = 0; input_i < ConfigData.Size; input_i++)
{
ImFontConfig& cfg = ConfigData[input_i];
ImFontTempBuildData& tmp = tmp_array[input_i];
IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == this));
const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)cfg.FontData, cfg.FontNo);
IM_ASSERT(font_offset >= 0);
if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
return false;
// Count glyphs
if (!cfg.GlyphRanges)
cfg.GlyphRanges = GetGlyphRangesDefault();
for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2)
{
for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2, total_glyph_range_count++)
total_glyph_count += (in_range[1] - in_range[0]) + 1;
total_glyph_range_count++;
}
}
// Start packing. We need a known width for the skyline algorithm. Using a cheap heuristic here to decide of width. User can override TexDesiredWidth and TexGlyphPadding if they wish.
// Start packing. We need a known width for the skyline algorithm. Using a dumb heuristic here to decide of width. User can override TexDesiredWidth and TexGlyphPadding if they wish.
// After packing is done, width shouldn't matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
TexWidth = (TexDesiredWidth > 0) ? TexDesiredWidth : (total_glyph_count > 4000) ? 4096 : (total_glyph_count > 2000) ? 2048 : (total_glyph_count > 1000) ? 1024 : 512;
TexHeight = 0;
@ -1332,6 +1315,26 @@ bool ImFontAtlas::Build()
if (extra_rects[i].was_packed)
TexHeight = ImMax(TexHeight, extra_rects[i].y + extra_rects[i].h);
// Initialize font information (so we can error without any cleanup)
struct ImFontTempBuildData
{
stbtt_fontinfo FontInfo;
stbrp_rect* Rects;
stbtt_pack_range* Ranges;
int RangesCount;
};
ImFontTempBuildData* tmp_array = (ImFontTempBuildData*)ImGui::MemAlloc((size_t)ConfigData.Size * sizeof(ImFontTempBuildData));
for (int input_i = 0; input_i < ConfigData.Size; input_i++)
{
ImFontConfig& cfg = ConfigData[input_i];
ImFontTempBuildData& tmp = tmp_array[input_i];
IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == this));
const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)cfg.FontData, cfg.FontNo);
IM_ASSERT(font_offset >= 0);
if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
return false;
}
// 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));
@ -1350,11 +1353,8 @@ bool ImFontAtlas::Build()
// Setup ranges
int glyph_count = 0;
int glyph_ranges_count = 0;
for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2)
{
for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2, glyph_ranges_count++)
glyph_count += (in_range[1] - in_range[0]) + 1;
glyph_ranges_count++;
}
tmp.Ranges = buf_ranges + buf_ranges_n;
tmp.RangesCount = glyph_ranges_count;
buf_ranges_n += glyph_ranges_count;
@ -1392,7 +1392,7 @@ bool ImFontAtlas::Build()
spc.pixels = TexPixelsAlpha8;
spc.height = TexHeight;
// Second pass: render characters
// Second pass: render font characters
for (int input_i = 0; input_i < ConfigData.Size; input_i++)
{
ImFontConfig& cfg = ConfigData[input_i];