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Doc: Tweak and extra mention of AddCustomRectFontGlyph + made the example register two rectangles.

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omar
2019-06-26 12:15:32 +02:00
parent eb3e271c24
commit 4b95e7c2f3
2 changed files with 16 additions and 8 deletions
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22
misc/fonts/README.txt
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@ -212,9 +212,11 @@ texture, and blit/copy any graphics data of your choice into those rectangles.
Pseudo-code:
// Add font, then register one custom 13x13 rectangle mapped to glyph 'a' of this font
// Add font, then register two custom 13x13 rectangles mapped to glyph 'a' and 'b' of this font
ImFont* font = io.Fonts->AddFontDefault();
int rect_id = io.Fonts->AddCustomRectFontGlyph(font, 'a', 13, 13, 13+1);
int rect_ids[2];
rect_ids[0] = io.Fonts->AddCustomRectFontGlyph(font, 'a', 13, 13, 13+1);
rect_ids[1] = io.Fonts->AddCustomRectFontGlyph(font, 'b', 13, 13, 13+1);
// Build atlas
io.Fonts->Build();
@ -224,14 +226,18 @@ Pseudo-code:
int tex_width, tex_height;
io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_width, &tex_height);
// Fill the custom rectangle with red pixels (in reality you would draw/copy your bitmap data here)
if (const ImFontAtlas::CustomRect* rect = io.Fonts->GetCustomRectByIndex(rect_id))
for (int rect_n = 0; rect_n < IM_ARRAYSIZE(rect_ids); rect_n++)
{
for (int y = 0; y < rect->Height; y++)
int rect_id = rects_ids[rect_n];
if (const ImFontAtlas::CustomRect* rect = io.Fonts->GetCustomRectByIndex(rect_id))
{
ImU32* p = (ImU32*)tex_pixels + (rect->Y + y) * tex_width + (rect->X);
for (int x = rect->Width; x > 0; x--)
*p++ = IM_COL32(255, 0, 0, 255);
// Fill the custom rectangle with red pixels (in reality you would draw/copy your bitmap data here!)
for (int y = 0; y < rect->Height; y++)
{
ImU32* p = (ImU32*)tex_pixels + (rect->Y + y) * tex_width + (rect->X);
for (int x = rect->Width; x > 0; x--)
*p++ = IM_COL32(255, 0, 0, 255);
}
}
}