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ImFontAtlas: Added ImFontAtlasFlags_NoPowerOfTwoHeight, ImFontAtlasFl…
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…ags_NoMouseCursors flags. (#1613)
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@ocornut
ocornut committed Feb 14, 2018
1 parent 42bf6a4 commit fed0a88
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Showing 3 changed files with 39 additions and 15 deletions.
8 changes: 8 additions & 0 deletions imgui.h
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,7 @@ typedef int ImGuiMouseCursor; // enum: a mouse cursor identifier
typedef int ImGuiStyleVar; // enum: a variable identifier for styling // enum ImGuiStyleVar_
typedef int ImDrawCornerFlags; // flags: for ImDrawList::AddRect*() etc. // enum ImDrawCornerFlags_
typedef int ImDrawListFlags; // flags: for ImDrawList // enum ImDrawListFlags_
typedef int ImFontAtlasFlags; // flags: for ImFontAtlas // enum ImFontAtlasFlags_
typedef int ImGuiColorEditFlags; // flags: for ColorEdit*(), ColorPicker*() // enum ImGuiColorEditFlags_
typedef int ImGuiColumnsFlags; // flags: for *Columns*() // enum ImGuiColumnsFlags_
typedef int ImGuiDragDropFlags; // flags: for *DragDrop*() // enum ImGuiDragDropFlags_
Expand Down Expand Up @@ -1612,6 +1613,12 @@ struct ImFontGlyph
float U0, V0, U1, V1; // Texture coordinates
};

enum ImFontAtlasFlags_
{
ImFontAtlasFlags_NoPowerOfTwoHeight = 1 << 0, // Don't round the height to next power of two
ImFontAtlasFlags_NoMouseCursors = 1 << 1 // Don't build software mouse cursors into the atlas
};

// Load and rasterize multiple TTF/OTF 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.
Expand Down Expand Up @@ -1706,6 +1713,7 @@ struct ImFontAtlas

// [Internal]
// NB: Access texture data via GetTexData*() calls! Which will setup a default font for you.
ImFontAtlasFlags Flags; // Build flags
unsigned char* TexPixelsAlpha8; // 1 component per pixel, each component is unsigned 8-bit. Total size = TexWidth * TexHeight
unsigned int* TexPixelsRGBA32; // 4 component per pixel, each component is unsigned 8-bit. Total size = TexWidth * TexHeight * 4
int TexWidth; // Texture width calculated during Build().
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44 changes: 30 additions & 14 deletions imgui_draw.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1368,6 +1368,7 @@ ImFontAtlas::ImFontAtlas()
TexWidth = TexHeight = 0;
TexUvScale = ImVec2(0.0f, 0.0f);
TexUvWhitePixel = ImVec2(0.0f, 0.0f);
Flags = 0x00;
for (int n = 0; n < IM_ARRAYSIZE(CustomRectIds); n++)
CustomRectIds[n] = -1;
}
Expand Down Expand Up @@ -1619,6 +1620,8 @@ bool ImFontAtlas::GetMouseCursorTexData(ImGuiMouseCursor cursor_type, ImVec2* ou
{
if (cursor_type <= ImGuiMouseCursor_None || cursor_type >= ImGuiMouseCursor_Count_)
return false;
if (Flags & ImFontAtlasFlags_NoMouseCursors)
return false;

ImFontAtlas::CustomRect& r = CustomRects[CustomRectIds[0]];
IM_ASSERT(r.ID == FONT_ATLAS_DEFAULT_TEX_DATA_ID);
Expand Down Expand Up @@ -1774,7 +1777,7 @@ bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
IM_ASSERT(buf_ranges_n == total_ranges_count);

// Create texture
atlas->TexHeight = ImUpperPowerOfTwo(atlas->TexHeight);
atlas->TexHeight = (atlas->Flags & ImFontAtlasFlags_NoPowerOfTwoHeight) ? (atlas->TexHeight + 1) : ImUpperPowerOfTwo(atlas->TexHeight);
atlas->TexUvScale = ImVec2(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
atlas->TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(atlas->TexWidth * atlas->TexHeight);
memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
Expand Down Expand Up @@ -1854,8 +1857,12 @@ bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)

void ImFontAtlasBuildRegisterDefaultCustomRects(ImFontAtlas* atlas)
{
if (atlas->CustomRectIds[0] < 0)
if (atlas->CustomRectIds[0] >= 0)
return;
if (!(atlas->Flags & ImFontAtlasFlags_NoMouseCursors))
atlas->CustomRectIds[0] = atlas->AddCustomRectRegular(FONT_ATLAS_DEFAULT_TEX_DATA_ID, FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF*2+1, FONT_ATLAS_DEFAULT_TEX_DATA_H);
else
atlas->CustomRectIds[0] = atlas->AddCustomRectRegular(FONT_ATLAS_DEFAULT_TEX_DATA_ID, 2, 2);
}

void ImFontAtlasBuildSetupFont(ImFontAtlas* atlas, ImFont* font, ImFontConfig* font_config, float ascent, float descent)
Expand Down Expand Up @@ -1901,22 +1908,31 @@ void ImFontAtlasBuildPackCustomRects(ImFontAtlas* atlas, void* pack_context_opaq
static void ImFontAtlasBuildRenderDefaultTexData(ImFontAtlas* atlas)
{
IM_ASSERT(atlas->CustomRectIds[0] >= 0);
IM_ASSERT(atlas->TexPixelsAlpha8 != NULL);
ImFontAtlas::CustomRect& r = atlas->CustomRects[atlas->CustomRectIds[0]];
IM_ASSERT(r.ID == FONT_ATLAS_DEFAULT_TEX_DATA_ID);
IM_ASSERT(r.Width == FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF*2+1);
IM_ASSERT(r.Height == FONT_ATLAS_DEFAULT_TEX_DATA_H);
IM_ASSERT(r.IsPacked());
IM_ASSERT(atlas->TexPixelsAlpha8 != NULL);

// Render/copy pixels
for (int y = 0, n = 0; y < FONT_ATLAS_DEFAULT_TEX_DATA_H; y++)
for (int x = 0; x < FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF; x++, n++)
{
const int offset0 = (int)(r.X + x) + (int)(r.Y + y) * atlas->TexWidth;
const int offset1 = offset0 + FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF + 1;
atlas->TexPixelsAlpha8[offset0] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == '.' ? 0xFF : 0x00;
atlas->TexPixelsAlpha8[offset1] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == 'X' ? 0xFF : 0x00;
}
const int w = atlas->TexWidth;
if (!(atlas->Flags & ImFontAtlasFlags_NoMouseCursors))
{
// Render/copy pixels
IM_ASSERT(r.Width == FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF * 2 + 1 && r.Height == FONT_ATLAS_DEFAULT_TEX_DATA_H);
for (int y = 0, n = 0; y < FONT_ATLAS_DEFAULT_TEX_DATA_H; y++)
for (int x = 0; x < FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF; x++, n++)
{
const int offset0 = (int)(r.X + x) + (int)(r.Y + y) * w;
const int offset1 = offset0 + FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF + 1;
atlas->TexPixelsAlpha8[offset0] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == '.' ? 0xFF : 0x00;
atlas->TexPixelsAlpha8[offset1] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == 'X' ? 0xFF : 0x00;
}
}
else
{
IM_ASSERT(r.Width == 2 && r.Height == 2);
const int offset = (int)(r.X) + (int)(r.Y) * w;
atlas->TexPixelsAlpha8[offset] = atlas->TexPixelsAlpha8[offset + 1] = atlas->TexPixelsAlpha8[offset + w] = atlas->TexPixelsAlpha8[offset + w + 1] = 0xFF;
}
atlas->TexUvWhitePixel = ImVec2((r.X + 0.5f) * atlas->TexUvScale.x, (r.Y + 0.5f) * atlas->TexUvScale.y);
}

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2 changes: 1 addition & 1 deletion misc/freetype/imgui_freetype.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -295,7 +295,7 @@ bool ImGuiFreeType::BuildFontAtlas(ImFontAtlas* atlas, unsigned int extra_flags)
atlas->TexHeight = (int)(min_rects_per_column * (max_glyph_size.y + 1.0f));

// Create texture
atlas->TexHeight = ImUpperPowerOfTwo(atlas->TexHeight);
atlas->TexHeight = (atlas->Flags & ImFontAtlasFlags_NoPowerOfTwoHeight) ? (atlas->TexHeight + 1) : ImUpperPowerOfTwo(atlas->TexHeight);
atlas->TexUvScale = ImVec2(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
atlas->TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(atlas->TexWidth * atlas->TexHeight);
memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
Expand Down

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