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ImFontAtlas allows loading multiple fonts into same texture. Revamped new init API for 1.30

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This commit is contained in:
ocornut
2015-01-17 22:15:29 +00:00
parent cb9a3235be
commit 2c31599bcc
6 changed files with 488 additions and 335 deletions
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583
imgui.cpp
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@ -432,11 +432,9 @@ ImGuiStyle::ImGuiStyle()
Colors[ImGuiCol_TooltipBg] = ImVec4(0.05f, 0.05f, 0.10f, 0.90f);
}
// We statically allocate a default font storage for the user.
// This allows the user to avoid newing the default font, while keeping IO.Font a pointer which is easy to swap if needed.
// We cannot new() the font because user may override MemAllocFn after the ImGuiIO() constructor is called.
// For the same reason we cannot call LoadDefault() on the font by default, but it is called by GetTextureData*() API.
static ImFont GDefaultStaticFont;
// Statically allocated font atlas. This is merely a maneuver to keep its definition at the bottom of the .H file.
// Because we cannot new() at this point (before users may define IO.MemAllocFn)
static ImFontAtlas GDefaultFontAtlas;
ImGuiIO::ImGuiIO()
{
@ -446,7 +444,7 @@ ImGuiIO::ImGuiIO()
IniSavingRate = 5.0f;
IniFilename = "imgui.ini";
LogFilename = "imgui_log.txt";
Font = &GDefaultStaticFont;
FontAtlas = &GDefaultFontAtlas;
FontGlobalScale = 1.0f;
FontAllowUserScaling = false;
MousePos = ImVec2(-1,-1);
@ -1525,9 +1523,9 @@ void ImGui::NewFrame()
// Check user data
IM_ASSERT(g.IO.DeltaTime > 0.0f);
IM_ASSERT(g.IO.DisplaySize.x >= 0.0f && g.IO.DisplaySize.y >= 0.0f);
IM_ASSERT(g.IO.RenderDrawListsFn != NULL); // Must be implemented
IM_ASSERT(g.IO.Font); // Font not created
IM_ASSERT(g.IO.Font->IsLoaded()); // Font not loaded
IM_ASSERT(g.IO.RenderDrawListsFn != NULL); // Must be implemented
IM_ASSERT(g.IO.FontAtlas->IsBuilt()); // Font not created. Did you call io.FontAtlas->GetTexDataAsRGBA32 / GetTexDataAsAlpha8 ?
IM_ASSERT(g.IO.FontAtlas->Fonts[0]->IsLoaded()); // Font not created. Did you call io.FontAtlas->GetTexDataAsRGBA32 / GetTexDataAsAlpha8 ?
if (!g.Initialized)
{
@ -1540,7 +1538,7 @@ void ImGui::NewFrame()
g.Initialized = true;
}
SetFont(g.IO.Font);
SetFont(g.IO.FontAtlas->Fonts[0]);
g.Time += g.IO.DeltaTime;
g.FrameCount += 1;
@ -1694,15 +1692,7 @@ void ImGui::Shutdown()
fclose(g.LogFile);
g.LogFile = NULL;
}
if (g.IO.Font)
{
if (g.IO.Font != &GDefaultStaticFont)
{
g.IO.Font->~ImFont();
ImGui::MemFree(g.IO.Font);
}
g.IO.Font = NULL;
}
g.IO.FontAtlas->Clear();
if (g.PrivateClipboard)
{
@ -2372,7 +2362,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, ImVec2 size, float fill_alph
if (first_begin_of_the_frame)
{
window->DrawList->Clear();
window->DrawList->PushTextureID(g.Font->TexID);
window->DrawList->PushTextureID(g.Font->ContainerAtlas->TexID);
window->Visible = true;
// New windows appears in front
@ -2685,7 +2675,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, ImVec2 size, float fill_alph
else
{
// Short path when we do multiple Begin in the same frame.
window->DrawList->PushTextureID(g.Font->TexID);
window->DrawList->PushTextureID(g.Font->ContainerAtlas->TexID);
// Outer clipping rectangle
if ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_ComboBox))
@ -2798,10 +2788,11 @@ static void SetFont(ImFont* font)
{
ImGuiState& g = GImGui;
IM_ASSERT(font && font->IsLoaded());
IM_ASSERT(font->Scale > 0.0f);
g.Font = font;
g.FontSize = g.IO.FontGlobalScale * g.Font->FontSize * g.Font->Scale;
g.FontTexUvWhitePixel = g.Font->TexUvWhitePixel;
g.FontTexUvWhitePixel = g.Font->ContainerAtlas->TexUvWhitePixel;
g.Font->FallbackGlyph = NULL;
g.Font->FallbackGlyph = g.Font->FindGlyph(g.Font->FallbackChar);
}
@ -2810,9 +2801,12 @@ void ImGui::PushFont(ImFont* font)
{
ImGuiState& g = GImGui;
if (!font)
font = g.IO.FontAtlas->Fonts[0];
SetFont(font);
g.FontStack.push_back(font);
g.CurrentWindow->DrawList->PushTextureID(font->TexID);
g.CurrentWindow->DrawList->PushTextureID(font->ContainerAtlas->TexID);
}
void ImGui::PopFont()
@ -2821,7 +2815,7 @@ void ImGui::PopFont()
g.CurrentWindow->DrawList->PopTextureID();
g.FontStack.pop_back();
SetFont(g.FontStack.empty() ? g.IO.Font : g.FontStack.back());
SetFont(g.FontStack.empty() ? g.IO.FontAtlas->Fonts[0] : g.FontStack.back());
}
void ImGui::PushAllowKeyboardFocus(bool allow_keyboard_focus)
@ -6216,7 +6210,7 @@ void ImDrawList::AddText(ImFont* font, float font_size, const ImVec2& pos, ImU32
if (text_end == NULL)
text_end = text_begin + strlen(text_begin);
IM_ASSERT(font->TexID == texture_id_stack.back()); // Use high-level ImGui::PushFont() or low-level ImDrawList::PushTextureId() to change font.
IM_ASSERT(font->ContainerAtlas->TexID == texture_id_stack.back()); // Use high-level ImGui::PushFont() or low-level ImDrawList::PushTextureId() to change font.
// reserve vertices for worse case
const unsigned int char_count = (unsigned int)(text_end - text_begin);
@ -6255,29 +6249,80 @@ void ImDrawList::AddImage(ImTextureID user_texture_id, const ImVec2& a, const Im
}
//-----------------------------------------------------------------------------
// ImBitmapFont
// ImFontAtlias
//-----------------------------------------------------------------------------
ImFont::ImFont()
struct ImFontAtlas::ImFontAtlasData
{
Scale = 1.0f;
FallbackChar = (ImWchar)'?';
// Input
ImFont* OutFont; // Load into this font
void* TTFData; // TTF data, we own the memory
size_t TTFDataSize; // TTF data size, in bytes
float SizePixels; // Desired output size, in pixels
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)
// Temporary Build Data
stbtt_fontinfo FontInfo;
stbrp_rect* Rects;
ImVector<stbtt_pack_range> Ranges;
};
ImFontAtlas::ImFontAtlas()
{
TexID = NULL;
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
Clear();
TexWidth = TexHeight = 0;
TexExtraDataPos = TexUvWhitePixel = ImVec2(0, 0);
}
ImFont::~ImFont()
ImFontAtlas::~ImFontAtlas()
{
Clear();
ClearInputData();
ClearTexData();
}
void ImFont::GetTextureDataAlpha8(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
void ImFontAtlas::ClearInputData()
{
// Lazily load default font
if (!IsLoaded())
LoadDefault();
for (size_t i = 0; i < InputData.size(); i++)
{
if (InputData[i]->TTFData)
ImGui::MemFree(InputData[i]->TTFData);
ImGui::MemFree(InputData[i]);
}
InputData.clear();
}
void ImFontAtlas::ClearTexData()
{
if (TexPixelsAlpha8)
ImGui::MemFree(TexPixelsAlpha8);
if (TexPixelsRGBA32)
ImGui::MemFree(TexPixelsRGBA32);
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
}
void ImFontAtlas::ClearFonts()
{
for (size_t i = 0; i < Fonts.size(); i++)
{
Fonts[i]->~ImFont();
ImGui::MemFree(Fonts[i]);
}
Fonts.clear();
}
void ImFontAtlas::GetTexDataAsAlpha8(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
// Lazily build
if (TexPixelsAlpha8 == NULL)
{
if (InputData.empty())
AddFontDefault();
Build();
}
*out_pixels = TexPixelsAlpha8;
if (out_width) *out_width = TexWidth;
@ -6285,14 +6330,14 @@ void ImFont::GetTextureDataAlpha8(unsigned char** out_pixels, int* out_width,
if (out_bytes_per_pixel) *out_bytes_per_pixel = 1;
}
void ImFont::GetTextureDataRGBA32(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
void ImFontAtlas::GetTexDataAsRGBA32(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
// Lazily convert to RGBA32 format
// Although it is likely to be the most commonly used format, our font rendering is 8 bpp
if (!TexPixelsRGBA32)
{
unsigned char* pixels;
GetTextureDataAlpha8(&pixels, NULL, NULL);
GetTexDataAsAlpha8(&pixels, NULL, NULL);
TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc(TexWidth * TexHeight * 4);
const unsigned char* src = pixels;
unsigned int* dst = TexPixelsRGBA32;
@ -6306,33 +6351,251 @@ void ImFont::GetTextureDataRGBA32(unsigned char** out_pixels, int* out_width,
if (out_bytes_per_pixel) *out_bytes_per_pixel = 4;
}
void ImFont::ClearTextureData()
static void GetDefaultCompressedFontDataTTF(const void** ttf_compressed_data, unsigned int* ttf_compressed_size);
static unsigned int stb_decompress_length(unsigned char *input);
static unsigned int stb_decompress(unsigned char *output, unsigned char *i, unsigned int length);
// Load embedded ProggyClean.ttf at size 13
ImFont* ImFontAtlas::AddFontDefault()
{
if (TexPixelsAlpha8)
ImGui::MemFree(TexPixelsAlpha8);
if (TexPixelsRGBA32)
ImGui::MemFree(TexPixelsRGBA32);
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
// Get compressed data
unsigned int ttf_compressed_size;
const void* ttf_compressed;
GetDefaultCompressedFontDataTTF(&ttf_compressed, &ttf_compressed_size);
// Decompress
const size_t buf_decompressed_size = stb_decompress_length((unsigned char*)ttf_compressed);
unsigned char* buf_decompressed = (unsigned char *)ImGui::MemAlloc(buf_decompressed_size);
stb_decompress(buf_decompressed, (unsigned char*)ttf_compressed, ttf_compressed_size);
// Add
ImFont* font = AddFontFromMemoryTTF(buf_decompressed, buf_decompressed_size, 13.0f, ImFontAtlas::GetGlyphRangesDefault(), 0);
font->DisplayOffset.y += 1;
return font;
}
ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels, const ImWchar* glyph_ranges, int font_no)
{
void* data = NULL;
size_t data_size = 0;
if (!ImLoadFileToMemory(filename, "rb", (void**)&data, &data_size))
return NULL;
// Add
ImFont* font = AddFontFromMemoryTTF(data, data_size, size_pixels, glyph_ranges, font_no);
return font;
}
// NB: ownership of 'data' is given to ImFontAtlas which will clear it.
ImFont* ImFontAtlas::AddFontFromMemoryTTF(void* in_ttf_data, size_t in_ttf_data_size, float size_pixels, const ImWchar* glyph_ranges, int font_no)
{
// Create new font
ImFont* font = (ImFont*)ImGui::MemAlloc(sizeof(ImFont));
new (font) ImFont();
Fonts.push_back(font);
// Add to build list
ImFontAtlasData* data = (ImFontAtlasData*)ImGui::MemAlloc(sizeof(ImFontAtlasData));
memset(data, 0, sizeof(ImFontAtlasData));
data->OutFont = font;
data->TTFData = in_ttf_data;
data->TTFDataSize = in_ttf_data_size;
data->SizePixels = size_pixels;
data->GlyphRanges = glyph_ranges;
data->FontNo = 0;
InputData.push_back(data);
// Invalidate texture
ClearTexData();
return font;
}
bool ImFontAtlas::Build()
{
IM_ASSERT(InputData.size() > 0);
TexID = NULL;
TexWidth = TexHeight = 0;
TexExtraDataPos = TexUvWhitePixel = ImVec2(0, 0);
ClearTexData();
// Initialize font information early (so we can error without any cleanup) + count glyphs
int total_glyph_count = 0;
for (size_t input_i = 0; input_i < InputData.size(); input_i++)
{
ImFontAtlasData& data = *InputData[input_i];
const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)data.TTFData, data.FontNo);
IM_ASSERT(font_offset >= 0);
if (!stbtt_InitFont(&data.FontInfo, (unsigned char*)data.TTFData, font_offset))
return false;
for (const ImWchar* in_range = InputData[input_i]->GlyphRanges; in_range[0] && in_range[1]; in_range += 2)
total_glyph_count += (in_range[1] - in_range[0]) + 1;
}
// Start packing
TexWidth = (total_glyph_count > 3000) ? 2048 : (total_glyph_count > 1000) ? 1024 : 512; // Width doesn't actually matters.
TexHeight = 0;
const int max_tex_height = 1024*32;
stbtt_pack_context spc;
int ret = stbtt_PackBegin(&spc, NULL, TexWidth, max_tex_height, 0, 1, NULL);
IM_ASSERT(ret);
stbtt_PackSetOversampling(&spc, 1, 1);
// Pack our extra data rectangle first, so it will be on the upper-left corner of our texture (UV will have small values).
stbrp_rect extra_rect;
extra_rect.w = 16;
extra_rect.h = 16;
stbrp_pack_rects((stbrp_context*)spc.pack_info, &extra_rect, 1);
TexExtraDataPos = ImVec2(extra_rect.x, extra_rect.y);
// 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;
for (size_t input_i = 0; input_i < InputData.size(); input_i++)
{
ImFontAtlasData& data = *InputData[input_i];
if (!data.GlyphRanges)
data.GlyphRanges = ImFontAtlas::GetGlyphRangesDefault();
// Setup ranges
int glyph_count = 0;
int glyph_ranges_count = 0;
for (const ImWchar* in_range = data.GlyphRanges; in_range[0] && in_range[1]; in_range += 2)
{
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++)
{
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;
// Allocate characters and flag as not packed
// FIXME-OPT: Loose ranges will incur lots of allocations. Allocate all contiguous in loop above.
range.chardata_for_range = (stbtt_packedchar*)ImGui::MemAlloc(range.num_chars_in_range * sizeof(stbtt_packedchar));
for (int j = 0; j < range.num_chars_in_range; ++j)
range.chardata_for_range[j].x0 = range.chardata_for_range[j].y0 = range.chardata_for_range[j].x1 = range.chardata_for_range[j].y1 = 0;
}
// Pack
data.Rects = (stbrp_rect*)ImGui::MemAlloc(sizeof(stbrp_rect) * glyph_count);
IM_ASSERT(data.Rects);
const int n = stbtt_PackFontRangesGatherRects(&spc, &data.FontInfo, data.Ranges.begin(), data.Ranges.size(), data.Rects);
stbrp_pack_rects((stbrp_context*)spc.pack_info, data.Rects, n);
// Extend texture height
for (int i = 0; i < n; i++)
if (data.Rects[i].was_packed)
tex_height = ImMax(tex_height, data.Rects[i].y + data.Rects[i].h);
}
// Create texture
TexHeight = ImUpperPowerOfTwo(tex_height);
TexPixelsAlpha8 = (unsigned char*)ImGui::MemRealloc(TexPixelsAlpha8, TexWidth * TexHeight);
memset(TexPixelsAlpha8, 0, TexWidth * TexHeight);
spc.pixels = TexPixelsAlpha8;
spc.height = TexHeight;
// Second pass: render characters
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);
ImGui::MemFree(data.Rects);
data.Rects = NULL;
}
// End packing
stbtt_PackEnd(&spc);
// Third pass: setup ImFont and glyphs for runtime
for (size_t input_i = 0; input_i < InputData.size(); input_i++)
{
ImFontAtlasData& data = *InputData[input_i];
data.OutFont->ContainerAtlas = this;
data.OutFont->FontSize = data.SizePixels;
const float font_scale = stbtt_ScaleForPixelHeight(&data.FontInfo, data.SizePixels);
int font_ascent, font_descent, font_line_gap;
stbtt_GetFontVMetrics(&data.FontInfo, &font_ascent, &font_descent, &font_line_gap);
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++)
{
stbtt_pack_range& range = data.Ranges[i];
for (int char_idx = 0; char_idx < range.num_chars_in_range; char_idx += 1)
{
const int codepoint = range.first_unicode_char_in_range + char_idx;
const stbtt_packedchar& pc = range.chardata_for_range[char_idx];
if (!pc.x0 && !pc.x1 && !pc.y0 && !pc.y1)
continue;
data.OutFont->Glyphs.resize(data.OutFont->Glyphs.size() + 1);
ImFont::Glyph& glyph = data.OutFont->Glyphs.back();
glyph.Codepoint = (ImWchar)codepoint;
glyph.Width = pc.x1 - pc.x0 + 1;
glyph.Height = pc.y1 - pc.y0 + 1;
glyph.XOffset = (signed short)(pc.xoff);
glyph.YOffset = (signed short)(pc.yoff) + (int)(font_ascent * font_scale);
glyph.XAdvance = (signed short)(pc.xadvance + character_spacing_x); // Bake spacing into XAdvance
glyph.U0 = ((float)pc.x0 - 0.5f) * uv_scale_x;
glyph.V0 = ((float)pc.y0 - 0.5f) * uv_scale_y;
glyph.U1 = ((float)pc.x0 - 0.5f + glyph.Width) * uv_scale_x;
glyph.V1 = ((float)pc.y0 - 0.5f + glyph.Height) * uv_scale_y;
}
}
data.OutFont->BuildLookupTable();
// Cleanup temporary
for (size_t i = 0; i < data.Ranges.size(); i++)
ImGui::MemFree(data.Ranges[i].chardata_for_range);
data.Ranges.clear();
}
// Draw white pixel into texture and make UV points to it
TexPixelsAlpha8[0] = TexPixelsAlpha8[1] = TexPixelsAlpha8[TexWidth+0] = TexPixelsAlpha8[TexWidth+1] = 0xFF;
TexUvWhitePixel = ImVec2((TexExtraDataPos.x + 0.5f) / TexWidth, (TexExtraDataPos.y + 0.5f) / TexHeight);
ClearInputData();
return true;
}
//-----------------------------------------------------------------------------
// ImFont
//-----------------------------------------------------------------------------
ImFont::ImFont()
{
Scale = 1.0f;
FallbackChar = (ImWchar)'?';
Clear();
}
ImFont::~ImFont()
{
Clear();
}
void ImFont::Clear()
{
FontSize = 0.0f;
DisplayOffset = ImVec2(-0.5f, 0.5f);
ClearTextureData();
TexID = NULL;
TexWidth = TexHeight = 0;
TexExtraDataPos = TexUvWhitePixel = ImVec2(0, 0);
ContainerAtlas = NULL;
Glyphs.clear();
IndexLookup.clear();
FallbackGlyph = NULL;
}
// Retrieve list of range (2 int per range, values are inclusive)
const ImWchar* ImFont::GetGlyphRangesDefault()
const ImWchar* ImFontAtlas::GetGlyphRangesDefault()
{
static const ImWchar ranges[] =
{
@ -6342,7 +6605,7 @@ const ImWchar* ImFont::GetGlyphRangesDefault()
return &ranges[0];
}
const ImWchar* ImFont::GetGlyphRangesChinese()
const ImWchar* ImFontAtlas::GetGlyphRangesChinese()
{
static const ImWchar ranges[] =
{
@ -6355,7 +6618,7 @@ const ImWchar* ImFont::GetGlyphRangesChinese()
return &ranges[0];
}
const ImWchar* ImFont::GetGlyphRangesJapanese()
const ImWchar* ImFontAtlas::GetGlyphRangesJapanese()
{
// Store the 1946 ideograms code points as successive offsets from the initial unicode codepoint 0x4E00. Each offset has an implicit +1.
// This encoding helps us reduce the source code size.
@ -6415,167 +6678,6 @@ const ImWchar* ImFont::GetGlyphRangesJapanese()
return &ranges[0];
}
static void GetDefaultCompressedFontDataTTF(const void** ttf_compressed_data, unsigned int* ttf_compressed_size);
static unsigned int stb_decompress_length(unsigned char *input);
static unsigned int stb_decompress(unsigned char *output, unsigned char *i, unsigned int length);
// Load embedded ProggyClean.ttf at size 13
bool ImFont::LoadDefault()
{
// Get compressed data
unsigned int ttf_compressed_size;
const void* ttf_compressed;
GetDefaultCompressedFontDataTTF(&ttf_compressed, &ttf_compressed_size);
// Decompress
const size_t buf_decompressed_size = stb_decompress_length((unsigned char*)ttf_compressed);
unsigned char* buf_decompressed = (unsigned char *)ImGui::MemAlloc(buf_decompressed_size);
stb_decompress(buf_decompressed, (unsigned char*)ttf_compressed, ttf_compressed_size);
// Load TTF
const bool ret = LoadFromMemoryTTF((void *)buf_decompressed, buf_decompressed_size, 13.0f, ImFont::GetGlyphRangesDefault(), 0);
ImGui::MemFree(buf_decompressed);
DisplayOffset.y += 1;
return ret;
}
bool ImFont::LoadFromFileTTF(const char* filename, float size_pixels, const ImWchar* glyph_ranges, int font_no)
{
void* data = NULL;
size_t data_size = 0;
if (!ImLoadFileToMemory(filename, "rb", (void**)&data, &data_size))
return false;
const bool ret = LoadFromMemoryTTF(data, data_size, size_pixels, glyph_ranges, font_no);
ImGui::MemFree(data);
return ret;
}
bool ImFont::LoadFromMemoryTTF(const void* data, size_t data_size, float size_pixels, const ImWchar* glyph_ranges, int font_no)
{
Clear();
if (!glyph_ranges)
glyph_ranges = GetGlyphRangesDefault();
// Initialize font information
stbtt_fontinfo ttf_info;
const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)data, font_no);
IM_ASSERT(font_offset >= 0);
if (!stbtt_InitFont(&ttf_info, (unsigned char*)data, font_offset))
return false;
// Setup ranges
int glyph_count = 0;
int glyph_ranges_count = 0;
for (const ImWchar* in_range = glyph_ranges; in_range[0] && in_range[1]; in_range += 2)
{
glyph_count += (in_range[1] - in_range[0]) + 1;
glyph_ranges_count++;
}
ImVector<stbtt_pack_range> ranges;
ranges.resize(glyph_ranges_count);
for (size_t i = 0; i < ranges.size(); i++)
{
stbtt_pack_range& range = ranges[i];
range.font_size = size_pixels;
const ImWchar* in_range = &glyph_ranges[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 = (stbtt_packedchar*)ImGui::MemAlloc(range.num_chars_in_range * sizeof(stbtt_packedchar));
}
{
TexWidth = (glyph_count > 1000) ? 1024 : 512; // Width doesn't really matters.
TexHeight = 0;
const int max_tex_height = 1024*32;
stbtt_pack_context spc;
int ret = stbtt_PackBegin(&spc, NULL, TexWidth, max_tex_height, 0, 1, NULL);
IM_ASSERT(ret);
stbtt_PackSetOversampling(&spc, 1, 1);
// Flag all characters as not packed
for (size_t i = 0; i < ranges.size(); ++i)
for (int j = 0; j < ranges[i].num_chars_in_range; ++j)
ranges[i].chardata_for_range[j].x0 = ranges[i].chardata_for_range[j].y0 = ranges[i].chardata_for_range[j].x1 = ranges[i].chardata_for_range[j].y1 = 0;
// Pack our extra data rectangle first, so it will be on the upper-left corner of our texture (UV will have small values).
stbrp_rect extra_rect;
extra_rect.w = 16;
extra_rect.h = 16;
stbrp_pack_rects((stbrp_context*)spc.pack_info, &extra_rect, 1);
TexExtraDataPos = ImVec2(extra_rect.x, extra_rect.y);
// Pack
stbrp_rect* rects = (stbrp_rect*)ImGui::MemAlloc(sizeof(*rects) * glyph_count);
IM_ASSERT(rects);
const int n = stbtt_PackFontRangesGatherRects(&spc, &ttf_info, ranges.begin(), ranges.size(), rects);
stbrp_pack_rects((stbrp_context*)spc.pack_info, rects, n);
// Create texture
int tex_h = 0;
for (int i = 0; i < n; i++)
if (rects[i].was_packed)
tex_h = ImMax(tex_h, rects[i].y + rects[i].h);
TexHeight = ImUpperPowerOfTwo(tex_h);
TexPixelsAlpha8 = (unsigned char*)ImGui::MemRealloc(TexPixelsAlpha8, TexWidth * TexHeight);
memset(TexPixelsAlpha8, 0, TexWidth * TexHeight);
// Render characters
spc.pixels = TexPixelsAlpha8;
spc.height = TexHeight;
ret = stbtt_PackFontRangesRenderIntoRects(&spc, &ttf_info, ranges.begin(), ranges.size(), rects);
stbtt_PackEnd(&spc);
ImGui::MemFree(rects);
}
// Setup glyphs for runtime
FontSize = size_pixels;
const float font_scale = stbtt_ScaleForPixelHeight(&ttf_info, size_pixels);
int font_ascent, font_descent, font_line_gap;
stbtt_GetFontVMetrics(&ttf_info, &font_ascent, &font_descent, &font_line_gap);
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 < ranges.size(); i++)
{
stbtt_pack_range& range = ranges[i];
for (int char_idx = 0; char_idx < range.num_chars_in_range; char_idx += 1)
{
const int codepoint = range.first_unicode_char_in_range + char_idx;
const stbtt_packedchar& pc = range.chardata_for_range[char_idx];
if (!pc.x0 && !pc.x1 && !pc.y0 && !pc.y1)
continue;
Glyphs.resize(Glyphs.size() + 1);
ImFont::Glyph& glyph = Glyphs.back();
glyph.Codepoint = (ImWchar)codepoint;
glyph.Width = pc.x1 - pc.x0 + 1;
glyph.Height = pc.y1 - pc.y0 + 1;
glyph.XOffset = (signed short)(pc.xoff);
glyph.YOffset = (signed short)(pc.yoff) + (int)(font_ascent * font_scale);
glyph.XAdvance = (signed short)(pc.xadvance + character_spacing_x); // Bake spacing into XAdvance
glyph.U0 = ((float)pc.x0 - 0.5f) * uv_scale_x;
glyph.V0 = ((float)pc.y0 - 0.5f) * uv_scale_y;
glyph.U1 = ((float)pc.x0 - 0.5f + glyph.Width) * uv_scale_x;
glyph.V1 = ((float)pc.y0 - 0.5f + glyph.Height) * uv_scale_y;
}
}
BuildLookupTable();
// Cleanup temporary
for (size_t i = 0; i < ranges.size(); i++)
ImGui::MemFree(ranges[i].chardata_for_range);
// Draw white pixel and make UV points to it
TexPixelsAlpha8[0] = TexPixelsAlpha8[1] = TexPixelsAlpha8[TexWidth+0] = TexPixelsAlpha8[TexWidth+1] = 0xFF;
TexUvWhitePixel = ImVec2((TexExtraDataPos.x + 0.5f) / TexWidth, (TexExtraDataPos.y + 0.5f) / TexHeight);
return true;
}
void ImFont::BuildLookupTable()
{
int max_codepoint = 0;
@ -7315,20 +7417,6 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
ImGui::TreePop();
}
// Font scaling options
// Note that those are not actually part of the style.
if (ImGui::TreeNode("Font"))
{
static float window_scale = 1.0f;
ImFont* font = ImGui::GetIO().Font;
ImGui::Text("Base Font Size: %.2f", font->FontSize);
ImGui::SliderFloat("window scale", &window_scale, 0.3f, 2.0f, "%.1f"); // scale only this window
ImGui::SliderFloat("font scale", &font->Scale, 0.3f, 2.0f, "%.1f"); // scale only this font
ImGui::SliderFloat("global scale", &ImGui::GetIO().FontGlobalScale, 0.3f, 2.0f, "%.1f"); // scale everything
ImGui::SetWindowFontScale(window_scale);
ImGui::TreePop();
}
ImGui::PopItemWidth();
}
@ -7375,12 +7463,38 @@ void ImGui::ShowTestWindow(bool* opened)
ImGui::Checkbox("no scrollbar", &no_scrollbar);
ImGui::SliderFloat("fill alpha", &fill_alpha, 0.0f, 1.0f);
if (ImGui::TreeNode("Style Editor"))
if (ImGui::TreeNode("Style"))
{
ImGui::ShowStyleEditor();
ImGui::TreePop();
}
if (ImGui::TreeNode("Fonts"))
{
ImGui::TextWrapped("Tip: Load fonts with GetIO().FontAtlas->AddFontFromFileTTF().");
for (size_t i = 0; i < ImGui::GetIO().FontAtlas->Fonts.size(); i++)
{
ImFont* font = ImGui::GetIO().FontAtlas->Fonts[i];
ImGui::BulletText("Font %d: %.2f pixels, %d glyphs", i, font->FontSize, font->Glyphs.size());
ImGui::TreePush((void*)i);
ImGui::PushFont(font);
ImGui::Text("The quick brown fox jumps over the lazy dog");
ImGui::PopFont();
if (i > 0 && ImGui::Button("Set as default"))
{
ImGui::GetIO().FontAtlas->Fonts[i] = ImGui::GetIO().FontAtlas->Fonts[0];
ImGui::GetIO().FontAtlas->Fonts[0] = font;
}
ImGui::SliderFloat("font scale", &font->Scale, 0.3f, 2.0f, "%.1f"); // scale only this font
ImGui::TreePop();
}
static float window_scale = 1.0f;
ImGui::SliderFloat("this window scale", &window_scale, 0.3f, 2.0f, "%.1f"); // scale only this window
ImGui::SliderFloat("global scale", &ImGui::GetIO().FontGlobalScale, 0.3f, 2.0f, "%.1f"); // scale everything
ImGui::SetWindowFontScale(window_scale);
ImGui::TreePop();
}
if (ImGui::TreeNode("Logging"))
{
ImGui::LogButtons();
@ -7475,9 +7589,10 @@ void ImGui::ShowTestWindow(bool* opened)
{
ImGui::TextWrapped("Below we are displaying the font texture (which is the only texture we have access to in this demo). Use the 'ImTextureID' type as storage to pass pointers or identifier to your own texture data. Hover the texture for a zoomed view!");
ImVec2 tex_screen_pos = ImGui::GetCursorScreenPos();
float tex_w = (float)ImGui::GetIO().Font->TexWidth;
float tex_h = (float)ImGui::GetIO().Font->TexHeight;
ImGui::Image(ImGui::GetIO().Font->TexID, ImVec2(tex_w, tex_h), ImVec2(0,0), ImVec2(1,1), 0xFFFFFFFF, 0x999999FF);
float tex_w = (float)ImGui::GetIO().FontAtlas->TexWidth;
float tex_h = (float)ImGui::GetIO().FontAtlas->TexHeight;
ImTextureID tex_id = ImGui::GetIO().FontAtlas->TexID;
ImGui::Image(tex_id, ImVec2(tex_w, tex_h), ImVec2(0,0), ImVec2(1,1), 0xFFFFFFFF, 0x999999FF);
if (ImGui::IsItemHovered())
{
ImGui::BeginTooltip();
@ -7488,7 +7603,7 @@ void ImGui::ShowTestWindow(bool* opened)
ImGui::Text("Max: (%.2f, %.2f)", focus_x + focus_sz, focus_y + focus_sz);
ImVec2 uv0 = ImVec2((focus_x) / tex_w, (focus_y) / tex_h);
ImVec2 uv1 = ImVec2((focus_x + focus_sz) / tex_w, (focus_y + focus_sz) / tex_h);
ImGui::Image(ImGui::GetIO().Font->TexID, ImVec2(128,128), uv0, uv1, 0xFFFFFFFF, 0x999999FF);
ImGui::Image(tex_id, ImVec2(128,128), uv0, uv1, 0xFFFFFFFF, 0x999999FF);
ImGui::EndTooltip();
}
ImGui::TreePop();