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ImFontAtlas: new AddFont() API, oversampling, subpositiong, merging fonts, etc. (#182, #220, #232, #242)

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ocornut
2015-07-15 07:01:21 -06:00
parent 6ae8062ca0
commit 815168c7ef
3 changed files with 241 additions and 117 deletions
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39
imgui.h
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@ -1115,6 +1115,27 @@ struct ImDrawData
void DeIndexAllBuffers(); // For backward compatibility: convert all buffers from indexed to de-indexed, in case you cannot render indexed. Note: this is slow and most likely a waste of resources. Always prefer indexed rendering!
};
struct ImFontConfig
{
void* FontData; // // TTF data
int FontDataSize; // // TTF data size
bool FontDataOwnedByAtlas; // true // TTF data ownership taken by the container ImFontAtlas (will delete memory itself). Set to true
int FontNo; // 0 // Index of font within TTF file
float SizePixels; // // Size in pixels for rasterizer
int OversampleH, OversampleV; // 3, 1 // Rasterize at higher quality for sub-pixel positioning. We don't use sub-pixel positions on the Y axis.
bool PixelSnapH; // false // Align every character to pixel boundary (if enabled, set OversampleH/V to 1)
ImVec2 GlyphExtraSpacing; // 0, 0 // Extra spacing (in pixels) between glyphs
const ImWchar* GlyphRanges; // // List of Unicode range (2 value per range, values are inclusive, zero-terminated list)
bool MergeMode; // false // Merge into previous ImFont, so you can combine multiple inputs font into one ImFont (e.g. ASCII font + icons + Japanese glyphs).
bool MergeGlyphCenterV; // false // When merging (multiple ImFontInput for one ImFont), vertically center new glyphs instead of aligning their baseline
// [Internal]
char Name[32]; // Name (strictly for debugging)
ImFont* DstFont;
IMGUI_API ImFontConfig();
};
// Load and rasterize multiple TTF fonts into a same texture.
// Sharing a texture for multiple fonts allows us to reduce the number of draw calls during rendering.
// We also add custom graphic data into the texture that serves for ImGui.
@ -1127,10 +1148,11 @@ struct ImFontAtlas
{
IMGUI_API ImFontAtlas();
IMGUI_API ~ImFontAtlas();
IMGUI_API ImFont* AddFont(const ImFontConfig* font_cfg);
IMGUI_API ImFont* AddFontDefault();
IMGUI_API ImFont* AddFontFromFileTTF(const char* filename, float size_pixels, const ImWchar* glyph_ranges = NULL, int font_no = 0);
IMGUI_API ImFont* AddFontFromMemoryTTF(void* ttf_data, int ttf_size, float size_pixels, const ImWchar* glyph_ranges = NULL, int font_no = 0); // Transfer ownership of 'ttf_data' to ImFontAtlas, will be deleted after Build()
IMGUI_API ImFont* AddFontFromMemoryCompressedTTF(const void* compressed_ttf_data, int compressed_ttf_size, float size_pixels, const ImWchar* glyph_ranges = NULL, int font_no = 0); // 'compressed_ttf_data' untouched and still owned by caller. Compress with binary_to_compressed_c.cpp
IMGUI_API ImFont* AddFontFromFileTTF(const char* filename, float size_pixels, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL);
IMGUI_API ImFont* AddFontFromMemoryTTF(void* ttf_data, int ttf_size, float size_pixels, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL); // Transfer ownership of 'ttf_data' to ImFontAtlas, will be deleted after Build()
IMGUI_API ImFont* AddFontFromMemoryCompressedTTF(const void* compressed_ttf_data, int compressed_ttf_size, float size_pixels, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL); // 'compressed_ttf_data' untouched and still owned by caller. Compress with binary_to_compressed_c.cpp
IMGUI_API void ClearTexData(); // Clear the CPU-side texture data. Saves RAM once the texture has been copied to graphics memory.
IMGUI_API void ClearInputData(); // Clear the input TTF data (inc sizes, glyph ranges)
IMGUI_API void ClearFonts(); // Clear the ImGui-side font data (glyphs storage, UV coordinates)
@ -1163,15 +1185,13 @@ struct ImFontAtlas
ImVector<ImFont*> Fonts;
// Private
struct ImFontAtlasData;
ImVector<ImFontAtlasData*> InputData; // Internal data
ImVector<ImFontConfig> ConfigData; // Internal data
IMGUI_API bool Build(); // Build pixels data. This is automatically for you by the GetTexData*** functions.
IMGUI_API void RenderCustomTexData(int pass, void* rects);
};
// TTF font loading and rendering
// Font runtime data and rendering
// ImFontAtlas automatically loads a default embedded font for you when you call GetTexDataAsAlpha8() or GetTexDataAsRGBA32().
// Kerning isn't supported. At the moment some ImGui code does per-character CalcTextSize calls, need something more state-ful.
struct ImFont
{
// Members: Settings
@ -1179,6 +1199,8 @@ struct ImFont
float Scale; // = 1.0f // Base font scale, multiplied by the per-window font scale which you can adjust with SetFontScale()
ImVec2 DisplayOffset; // = (0.0f,0.0f) // Offset font rendering by xx pixels
ImWchar FallbackChar; // = '?' // Replacement glyph if one isn't found. Only set via SetFallbackChar()
ImFontConfig* ConfigData; // // Pointer within ImFontAtlas->ConfigData
int ConfigDataCount; //
// Members: Runtime data
struct Glyph
@ -1188,8 +1210,7 @@ struct ImFont
float X0, Y0, X1, Y1;
float U0, V0, U1, V1; // Texture coordinates
};
float Ascent; // Distance from top to bottom of e.g. 'A' [0..FontSize]
float Descent; //
float Ascent, Descent; // Ascent: distance from top to bottom of e.g. 'A' [0..FontSize]
ImFontAtlas* ContainerAtlas; // What we has been loaded into
ImVector<Glyph> Glyphs;
const Glyph* FallbackGlyph; // == FindGlyph(FontFallbackChar)