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ImFontAtlas: Added TexUvScale (= 1.0f / (float)TexWidth, 1.0f / (float)TexHeight)

This commit is contained in:
omar 2018-01-20 20:32:23 +01:00
parent cd1409f4bf
commit 5eb293c879
2 changed files with 13 additions and 11 deletions
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1
imgui.h
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@ -1631,6 +1631,7 @@ struct ImFontAtlas
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().
int TexHeight; // Texture height calculated during Build().
ImVec2 TexUvScale; // = (1.0f/TexWidth, 1.0f/TexHeight)
ImVec2 TexUvWhitePixel; // Texture coordinates to a white pixel
ImVector<ImFont*> Fonts; // Hold all the fonts returned by AddFont*. Fonts[0] is the default font upon calling ImGui::NewFrame(), use ImGui::PushFont()/PopFont() to change the current font.
ImVector<CustomRect> CustomRects; // Rectangles for packing custom texture data into the atlas.

23
imgui_draw.cpp
View File

@ -1360,7 +1360,8 @@ ImFontAtlas::ImFontAtlas()
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
TexWidth = TexHeight = 0;
TexUvWhitePixel = ImVec2(0, 0);
TexUvScale = ImVec2(0.0f, 0.0f);
TexUvWhitePixel = ImVec2(0.0f, 0.0f);
for (int n = 0; n < IM_ARRAYSIZE(CustomRectIds); n++)
CustomRectIds[n] = -1;
}
@ -1604,8 +1605,8 @@ void ImFontAtlas::CalcCustomRectUV(const CustomRect* rect, ImVec2* out_uv_min, I
{
IM_ASSERT(TexWidth > 0 && TexHeight > 0); // Font atlas needs to be built before we can calculate UV coordinates
IM_ASSERT(rect->IsPacked()); // Make sure the rectangle has been packed
*out_uv_min = ImVec2((float)rect->X / TexWidth, (float)rect->Y / TexHeight);
*out_uv_max = ImVec2((float)(rect->X + rect->Width) / TexWidth, (float)(rect->Y + rect->Height) / TexHeight);
*out_uv_min = ImVec2((float)rect->X * TexUvScale.x, (float)rect->Y * TexUvScale.y);
*out_uv_max = ImVec2((float)(rect->X + rect->Width) * TexUvScale.x, (float)(rect->Y + rect->Height) * TexUvScale.y);
}
bool ImFontAtlas::GetMouseCursorTexData(ImGuiMouseCursor cursor_type, ImVec2* out_offset, ImVec2* out_size, ImVec2 out_uv_border[2], ImVec2 out_uv_fill[2])
@ -1615,16 +1616,15 @@ bool ImFontAtlas::GetMouseCursorTexData(ImGuiMouseCursor cursor_type, ImVec2* ou
ImFontAtlas::CustomRect& r = CustomRects[CustomRectIds[0]];
IM_ASSERT(r.ID == FONT_ATLAS_DEFAULT_TEX_DATA_ID);
ImVec2 uv_scale(1.0f / TexWidth, 1.0f / TexHeight);
ImVec2 pos = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type][0] + ImVec2((float)r.X, (float)r.Y);
ImVec2 size = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type][1];
*out_size = size;
*out_offset = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type][2];
out_uv_border[0] = (pos) * uv_scale;
out_uv_border[1] = (pos + size) * uv_scale;
out_uv_border[0] = (pos) * TexUvScale;
out_uv_border[1] = (pos + size) * TexUvScale;
pos.x += FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF + 1;
out_uv_fill[0] = (pos) * uv_scale;
out_uv_fill[1] = (pos + size) * uv_scale;
out_uv_fill[0] = (pos) * TexUvScale;
out_uv_fill[1] = (pos + size) * TexUvScale;
return true;
}
@ -1658,7 +1658,8 @@ bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
atlas->TexID = NULL;
atlas->TexWidth = atlas->TexHeight = 0;
atlas->TexUvWhitePixel = ImVec2(0, 0);
atlas->TexUvScale = ImVec2(0.0f, 0.0f);
atlas->TexUvWhitePixel = ImVec2(0.0f, 0.0f);
atlas->ClearTexData();
// Count glyphs/ranges
@ -1767,6 +1768,7 @@ bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
// Create texture
atlas->TexHeight = 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);
spc.pixels = atlas->TexPixelsAlpha8;
@ -1908,8 +1910,7 @@ static void ImFontAtlasBuildRenderDefaultTexData(ImFontAtlas* atlas)
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 ImVec2 tex_uv_scale(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
atlas->TexUvWhitePixel = ImVec2((r.X + 0.5f) * tex_uv_scale.x, (r.Y + 0.5f) * tex_uv_scale.y);
atlas->TexUvWhitePixel = ImVec2((r.X + 0.5f) * atlas->TexUvScale.x, (r.Y + 0.5f) * atlas->TexUvScale.y);
}
void ImFontAtlasBuildFinish(ImFontAtlas* atlas)