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ImFontAtlas: Added TexDesiredWidth and tweaked default cheapo best-width choice(#327)

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This commit is contained in:
ocornut 2015-09-11 16:50:00 +01:00
parent bc8eb5e9cf
commit 0abe668221
3 changed files with 6 additions and 6 deletions
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5
imgui.h
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@ -1230,8 +1230,9 @@ struct ImFontAtlas
void* TexID; // User data to refer to the texture once it has been uploaded to user's graphic systems. It ia passed back to you during rendering.
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;
int TexHeight;
int TexWidth; // Texture width calculated during Build().
int TexHeight; // Texture height calculated during Build().
int TexDesiredWidth; // Texture width desired by user before Build(). Must be a power-of-two. If have many glyphs your graphics API have texture size restrictions you may want to increase texture width to decrease height.
ImVec2 TexUvWhitePixel; // Texture coordinates to a white pixel (part of the TexExtraData block)
ImVector<ImFont*> Fonts;

3
imgui_demo.cpp
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@ -206,9 +206,8 @@ void ImGui::ShowTestWindow(bool* opened)
{
ImGui::TextWrapped("Tip: Load fonts with io.Fonts->AddFontFromFileTTF().");
ImFontAtlas* atlas = ImGui::GetIO().Fonts;
if (ImGui::TreeNode("Atlas texture"))
if (ImGui::TreeNode("Atlas texture", "Atlas texture (%dx%d pixels)", atlas->TexWidth, atlas->TexHeight))
{
ImGui::Text("%dx%d pixels", atlas->TexWidth, atlas->TexHeight);
ImGui::Image(atlas->TexID, ImVec2((float)atlas->TexWidth, (float)atlas->TexHeight), ImVec2(0,0), ImVec2(1,1), ImColor(255,255,255,255), ImColor(255,255,255,128));
ImGui::TreePop();
}

4
imgui_draw.cpp
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@ -954,7 +954,7 @@ ImFontAtlas::ImFontAtlas()
TexID = NULL;
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
TexWidth = TexHeight = 0;
TexWidth = TexHeight = TexDesiredWidth = 0;
TexUvWhitePixel = ImVec2(0, 0);
}
@ -1195,7 +1195,7 @@ bool ImFontAtlas::Build()
}
// Start packing
TexWidth = (total_glyph_count > 1000) ? 1024 : 512; // Width doesn't actually matters.
TexWidth = (TexDesiredWidth > 0) ? TexDesiredWidth : (total_glyph_count > 2000) ? 2048 : (total_glyph_count > 1000) ? 1024 : 512; // Width doesn't actually matters much but some API/GPU have texture size limitations, and increasing width can decrease height.
TexHeight = 0;
const int max_tex_height = 1024*32;
stbtt_pack_context spc;