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imgui_freetype: add support for colored glyphs with ImGuiFreeTypeBuilderFlags_LoadColor (#3369)

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(squashed 4 commits)
This commit is contained in:
Petr Shurgalin
2021-01-28 16:57:37 +01:00
committed by ocornut
parent 4622fa4b66
commit 24aa6654df
3 changed files with 129 additions and 24 deletions
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89
misc/freetype/imgui_freetype.cpp
View File

@ -126,7 +126,7 @@ namespace
void SetPixelHeight(int pixel_height); // Change font pixel size. All following calls to RasterizeGlyph() will use this size
const FT_Glyph_Metrics* LoadGlyph(uint32_t in_codepoint);
const FT_Bitmap* RenderGlyphAndGetInfo(GlyphInfo* out_glyph_info);
void BlitGlyph(const FT_Bitmap* ft_bitmap, uint8_t* dst, uint32_t dst_pitch, unsigned char* multiply_table = NULL);
void BlitGlyph(const FT_Bitmap* ft_bitmap, uint32_t* dst, uint32_t dst_pitch, unsigned char* multiply_table = NULL);
~FreeTypeFont() { CloseFont(); }
// [Internals]
@ -173,6 +173,9 @@ namespace
else
RenderMode = FT_RENDER_MODE_NORMAL;
if (UserFlags & ImGuiFreeTypeBuilderFlags_LoadColor)
LoadFlags |= FT_LOAD_COLOR;
return true;
}
@ -253,7 +256,7 @@ namespace
return ft_bitmap;
}
void FreeTypeFont::BlitGlyph(const FT_Bitmap* ft_bitmap, uint8_t* dst, uint32_t dst_pitch, unsigned char* multiply_table)
void FreeTypeFont::BlitGlyph(const FT_Bitmap* ft_bitmap, uint32_t* dst, uint32_t dst_pitch, unsigned char* multiply_table)
{
IM_ASSERT(ft_bitmap != NULL);
const uint32_t w = ft_bitmap->width;
@ -268,13 +271,18 @@ namespace
if (multiply_table == NULL)
{
for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
memcpy(dst, src, w);
{
for (uint32_t x = 0; x < w; x++)
dst[x] = IM_COL32(255, 255, 255, src[x]);
}
}
else
{
for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
{
for (uint32_t x = 0; x < w; x++)
dst[x] = multiply_table[src[x]];
dst[x] = IM_COL32(255, 255, 255, multiply_table[src[x]]);
}
}
break;
}
@ -290,11 +298,43 @@ namespace
{
if ((x & 7) == 0)
bits = *bits_ptr++;
dst[x] = (bits & 0x80) ? color1 : color0;
dst[x] = IM_COL32(255, 255, 255, (bits & 0x80) ? color1 : color0);
}
}
break;
}
case FT_PIXEL_MODE_BGRA:
{
#define DE_MULTIPLY(color, alpha) (ImU32)(255.0f * (float)color / (float)alpha + 0.5f)
if (multiply_table == NULL)
{
for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
{
for (uint32_t x = 0; x < w; x++)
dst[x] = IM_COL32(
DE_MULTIPLY(src[x * 4 + 2], src[x * 4 + 3]),
DE_MULTIPLY(src[x * 4 + 1], src[x * 4 + 3]),
DE_MULTIPLY(src[x * 4], src[x * 4 + 3]),
src[x * 4 + 3]);
}
}
else
{
for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
{
for (uint32_t x = 0; x < w; x++)
dst[x] = IM_COL32(
multiply_table[DE_MULTIPLY(src[x * 4 + 2], src[x * 4 + 3])],
multiply_table[DE_MULTIPLY(src[x * 4 + 1], src[x * 4 + 3])],
multiply_table[DE_MULTIPLY(src[x * 4], src[x * 4 + 3])],
multiply_table[src[x * 4 + 3]]);
}
}
#undef DE_MULTIPLY
break;
}
default:
IM_ASSERT(0 && "FreeTypeFont::BlitGlyph(): Unknown bitmap pixel mode!");
}
@ -318,7 +358,7 @@ struct ImFontBuildSrcGlyphFT
{
GlyphInfo Info;
uint32_t Codepoint;
unsigned char* BitmapData; // Point within one of the dst_tmp_bitmap_buffers[] array
unsigned int* BitmapData; // Point within one of the dst_tmp_bitmap_buffers[] array
};
struct ImFontBuildSrcDataFT
@ -498,7 +538,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
IM_ASSERT(ft_bitmap);
// Allocate new temporary chunk if needed
const int bitmap_size_in_bytes = src_glyph.Info.Width * src_glyph.Info.Height;
const int bitmap_size_in_bytes = src_glyph.Info.Width * src_glyph.Info.Height * 4;
if (buf_bitmap_current_used_bytes + bitmap_size_in_bytes > BITMAP_BUFFERS_CHUNK_SIZE)
{
buf_bitmap_current_used_bytes = 0;
@ -506,9 +546,9 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
}
// Blit rasterized pixels to our temporary buffer and keep a pointer to it.
src_glyph.BitmapData = buf_bitmap_buffers.back() + buf_bitmap_current_used_bytes;
src_glyph.BitmapData = (unsigned int*)(buf_bitmap_buffers.back() + buf_bitmap_current_used_bytes);
buf_bitmap_current_used_bytes += bitmap_size_in_bytes;
src_tmp.Font.BlitGlyph(ft_bitmap, src_glyph.BitmapData, src_glyph.Info.Width * 1, multiply_enabled ? multiply_table : NULL);
src_tmp.Font.BlitGlyph(ft_bitmap, src_glyph.BitmapData, src_glyph.Info.Width, multiply_enabled ? multiply_table : NULL);
src_tmp.Rects[glyph_i].w = (stbrp_coord)(src_glyph.Info.Width + padding);
src_tmp.Rects[glyph_i].h = (stbrp_coord)(src_glyph.Info.Height + padding);
@ -555,8 +595,16 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
// 7. Allocate texture
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*)IM_ALLOC(atlas->TexWidth * atlas->TexHeight);
memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
if (extra_flags & ImGuiFreeTypeBuilderFlags_LoadColor)
{
atlas->TexPixelsRGBA32 = (unsigned int*)IM_ALLOC(atlas->TexWidth * atlas->TexHeight * 4);
memset(atlas->TexPixelsRGBA32, 0, atlas->TexWidth * atlas->TexHeight * 4);
}
else
{
atlas->TexPixelsAlpha8 = (unsigned char*)IM_ALLOC(atlas->TexWidth * atlas->TexHeight);
memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
}
// 8. Copy rasterized font characters back into the main texture
// 9. Setup ImFont and glyphs for runtime
@ -596,10 +644,21 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
// Blit from temporary buffer to final texture
size_t blit_src_stride = (size_t)src_glyph.Info.Width;
size_t blit_dst_stride = (size_t)atlas->TexWidth;
unsigned char* blit_src = src_glyph.BitmapData;
unsigned char* blit_dst = atlas->TexPixelsAlpha8 + (ty * blit_dst_stride) + tx;
for (int y = info.Height; y > 0; y--, blit_dst += blit_dst_stride, blit_src += blit_src_stride)
memcpy(blit_dst, blit_src, blit_src_stride);
unsigned int* blit_src = src_glyph.BitmapData;
if (atlas->TexPixelsAlpha8 != NULL)
{
unsigned char* blit_dst = atlas->TexPixelsAlpha8 + (ty * blit_dst_stride) + tx;
for (int y = 0; y < info.Height; y++, blit_dst += blit_dst_stride, blit_src += blit_src_stride)
for (int x = 0; x < info.Width; x++)
blit_dst[x] = (unsigned char)((blit_src[x] >> IM_COL32_A_SHIFT) & 0xFF);
}
else
{
unsigned int* blit_dst = atlas->TexPixelsRGBA32 + (ty * blit_dst_stride) + tx;
for (int y = 0; y < info.Height; y++, blit_dst += blit_dst_stride, blit_src += blit_src_stride)
for (int x = 0; x < info.Width; x++)
blit_dst[x] = blit_src[x];
}
// Register glyph
float x0 = info.OffsetX + font_off_x;

3
misc/freetype/imgui_freetype.h
View File

@ -25,7 +25,8 @@ enum ImGuiFreeTypeBuilderFlags
ImGuiFreeTypeBuilderFlags_MonoHinting = 1 << 4, // Strong hinting algorithm that should only be used for monochrome output.
ImGuiFreeTypeBuilderFlags_Bold = 1 << 5, // Styling: Should we artificially embolden the font?
ImGuiFreeTypeBuilderFlags_Oblique = 1 << 6, // Styling: Should we slant the font, emulating italic style?
ImGuiFreeTypeBuilderFlags_Monochrome = 1 << 7 // Disable anti-aliasing. Combine this with MonoHinting for best results!
ImGuiFreeTypeBuilderFlags_Monochrome = 1 << 7, // Disable anti-aliasing. Combine this with MonoHinting for best results!
ImGuiFreeTypeBuilderFlags_LoadColor = 1 << 8 // Enable FreeType color-layered glyphs
};
namespace ImGuiFreeType