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Font: Narrow ellipsis: once we know an ellipsis is going to be drawn, we can claim the space between pos_max.x and ellipsis_max.x which gives us enough extra space to not requires the further (and otherwise valid) optimizations. Gets us vastly simplified code, yay. (#2775)

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This commit is contained in:
omar 2019-09-17 11:11:14 +02:00
parent 57623c15dd
commit 1c951dca97
1 changed files with 9 additions and 55 deletions
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64
imgui.cpp
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@ -2496,6 +2496,10 @@ void ImGui::RenderTextEllipsis(ImDrawList* draw_list, const ImVec2& pos_min, con
text_end_full = FindRenderedTextEnd(text);
const ImVec2 text_size = text_size_if_known ? *text_size_if_known : CalcTextSize(text, text_end_full, false, 0.0f);
//draw_list->AddLine(ImVec2(pos_max.x, pos_min.y - 4), ImVec2(pos_max.x, pos_max.y + 4), IM_COL32(0, 0, 255, 255));
//draw_list->AddLine(ImVec2(ellipsis_max_x, pos_min.y-2), ImVec2(ellipsis_max_x, pos_max.y+2), IM_COL32(0, 255, 0, 255));
//draw_list->AddLine(ImVec2(clip_max_x, pos_min.y), ImVec2(clip_max_x, pos_max.y), IM_COL32(255, 0, 0, 255));
// FIXME: We could technically remove (last_glyph->AdvanceX - last_glyph->X1) from text_size.x here and save a few pixels.
if (text_size.x > pos_max.x - pos_min.x)
{
// Hello wo...
@ -2518,7 +2522,6 @@ void ImGui::RenderTextEllipsis(ImDrawList* draw_list, const ImVec2& pos_min, con
float ellipsis_glyph_width = glyph->X1; // Width of the glyph with no padding on either side
float ellipsis_total_width = ellipsis_glyph_width; // Full width of entire ellipsis
float push_left = 1.0f;
if (ellipsis_char_count > 1)
{
@ -2526,13 +2529,11 @@ void ImGui::RenderTextEllipsis(ImDrawList* draw_list, const ImVec2& pos_min, con
const float spacing_between_dots = 1.0f * (draw_list->_Data->FontSize / font->FontSize);
ellipsis_glyph_width = glyph->X1 - glyph->X0 + spacing_between_dots;
ellipsis_total_width = ellipsis_glyph_width * (float)ellipsis_char_count - spacing_between_dots;
if (glyph->X0 > 1.0f)
push_left = 0.0f; // Pushing ellipsis to the left will be accomplished by rendering the dot (X0).
}
float text_avail_width = ImMax((pos_max.x - ellipsis_total_width) - pos_min.x, 1.0f);
// We can now claim the space between pos_max.x and ellipsis_max.x
const float text_avail_width = ImMax((ImMax(pos_max.x, ellipsis_max_x) - ellipsis_total_width) - pos_min.x, 1.0f);
float text_size_clipped_x = font->CalcTextSizeA(font_size, text_avail_width, 0.0f, text, text_end_full, &text_end_ellipsis).x;
if (text == text_end_ellipsis && text_end_ellipsis < text_end_full)
{
// Always display at least 1 character if there's no room for character + ellipsis
@ -2546,57 +2547,10 @@ void ImGui::RenderTextEllipsis(ImDrawList* draw_list, const ImVec2& pos_min, con
text_size_clipped_x -= font->CalcTextSizeA(font_size, FLT_MAX, 0.0f, text_end_ellipsis, text_end_ellipsis + 1).x; // Ascii blanks are always 1 byte
}
if (text_end_ellipsis != text_end_full)
{
// +---- First invisible character we arrived at.
// / +-- Character that we hope to be first invisible.
// [l][i]
// ||||
// \ \__ extra_spacing when two characters got hidden
// \___ extra_spacing when one character got hidden
unsigned int c = 0;
float extra_spacing = 0.0f;
const char* text_end_ellipsis_prev = text_end_ellipsis;
text_end_ellipsis += ImTextCharFromUtf8(&c, text_end_ellipsis, text_end_full);
if (c && !ImCharIsBlankW(c))
{
// Free space after first invisible glyph
const ImFontGlyph* hidden_glyph = font->FindGlyph((ImWchar)c);
extra_spacing = hidden_glyph->AdvanceX - hidden_glyph->X1;
text_end_ellipsis += ImTextCharFromUtf8(&c, text_end_ellipsis, text_end_full);
if (c && !ImCharIsBlankW(c))
{
hidden_glyph = font->FindGlyph(text_end_ellipsis[1]);
// Space before next invisible glyph. This intentionally ignores space from the first invisible
// glyph as that space will serve as spacing between ellipsis and last visible character. Without
// doing this we may get into awkward situations where ellipsis pretty much sticks to the last
// visible character. This issue manifests with the default font for word "Brocolli" there both i
// and l are very thin. Unfortunately this makes fonts with wider gaps (like monospace) look a bit
// worse, but it is a fair middle ground.
extra_spacing = hidden_glyph->X0;
}
}
if (extra_spacing > 0)
{
// Repeat calculation hoping that we will get extra character visible
text_avail_width += extra_spacing;
// Text length calculation is essentially an optimized version of this:
// text_size_clipped_x = font->CalcTextSizeA(font_size, text_width, 0.0f, text, text_end_full, &text_end_ellipsis).x;
// It avoids calculating entire width of the string.
text_size_clipped_x += font->CalcTextSizeA(font_size, text_avail_width - text_size_clipped_x, 0.0f, text_end_ellipsis_prev, text_end_full, &text_end_ellipsis).x;
}
else
text_end_ellipsis = text_end_ellipsis_prev;
}
// Render text, render ellipsis
RenderTextClippedEx(draw_list, pos_min, ImVec2(clip_max_x, pos_max.y), text, text_end_ellipsis, &text_size, ImVec2(0.0f, 0.0f));
// This variable pushes ellipsis to the left from last visible character. This is mostly useful when rendering
// ellipsis character contained in the font. If we render ellipsis manually space is already adequate and extra
// spacing is not needed.
float ellipsis_x = pos_min.x + text_size_clipped_x + push_left;
if (ellipsis_x + ellipsis_total_width - push_left <= ellipsis_max_x)
float ellipsis_x = pos_min.x + text_size_clipped_x;
if (ellipsis_x + ellipsis_total_width <= ellipsis_max_x)
for (int i = 0; i < ellipsis_char_count; i++)
{
font->RenderChar(draw_list, font_size, ImVec2(ellipsis_x, pos_min.y), GetColorU32(ImGuiCol_Text), ellipsis_char);