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ColorPicker / ColorEdit: restore Hue when zeroing Saturation. (#2722, #2770)

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Issue is fixed by storing last active color picker color and last hue value when active color picker takes rgb as input. Then if current color picker color matches last active color - hue value will be restored. IDs are not used because ColorEdit4() and ColorWidget4() may call each other in hard-to-predict ways and they both push their own IDs on to the stack. We need hue restoration to happen in entire stack of these widgets if topmost widget used hue restoration. Since these widgets operate on exact same color value - color was chosen as a factor deciding which widgets should restore hue.
This commit is contained in:
Rokas Kupstys 2019-08-31 18:44:20 +03:00 committed by omar
parent 656c515bad
commit accb0261b8
2 changed files with 20 additions and 0 deletions
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2
imgui_internal.h
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@ -1012,6 +1012,8 @@ struct ImGuiContext
ImFont InputTextPasswordFont;
ImGuiID TempInputTextId; // Temporary text input when CTRL+clicking on a slider, etc.
ImGuiColorEditFlags ColorEditOptions; // Store user options for color edit widgets
float ColorEditLastHue;
float ColorEditLastActiveColor[3];
ImVec4 ColorPickerRef;
bool DragCurrentAccumDirty;
float DragCurrentAccum; // Accumulator for dragging modification. Always high-precision, not rounded by end-user precision settings

18
imgui_widgets.cpp
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@ -4200,7 +4200,12 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
if ((flags & ImGuiColorEditFlags_InputHSV) && (flags & ImGuiColorEditFlags_DisplayRGB))
ColorConvertHSVtoRGB(f[0], f[1], f[2], f[0], f[1], f[2]);
else if ((flags & ImGuiColorEditFlags_InputRGB) && (flags & ImGuiColorEditFlags_DisplayHSV))
{
ColorConvertRGBtoHSV(f[0], f[1], f[2], f[0], f[1], f[2]);
// Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
if (f[1] == 0 && memcmp(g.ColorEditLastActiveColor, col, sizeof(float) * 3) == 0)
f[0] = g.ColorEditLastHue;
}
int i[4] = { IM_F32_TO_INT8_UNBOUND(f[0]), IM_F32_TO_INT8_UNBOUND(f[1]), IM_F32_TO_INT8_UNBOUND(f[2]), IM_F32_TO_INT8_UNBOUND(f[3]) };
bool value_changed = false;
@ -4327,7 +4332,11 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
for (int n = 0; n < 4; n++)
f[n] = i[n] / 255.0f;
if ((flags & ImGuiColorEditFlags_DisplayHSV) && (flags & ImGuiColorEditFlags_InputRGB))
{
g.ColorEditLastHue = f[0];
ColorConvertHSVtoRGB(f[0], f[1], f[2], f[0], f[1], f[2]);
memcpy(g.ColorEditLastActiveColor, f, sizeof(float) * 3);
}
if ((flags & ImGuiColorEditFlags_DisplayRGB) && (flags & ImGuiColorEditFlags_InputHSV))
ColorConvertRGBtoHSV(f[0], f[1], f[2], f[0], f[1], f[2]);
@ -4504,7 +4513,12 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
float H = col[0], S = col[1], V = col[2];
float R = col[0], G = col[1], B = col[2];
if (flags & ImGuiColorEditFlags_InputRGB)
{
ColorConvertRGBtoHSV(R, G, B, H, S, V);
// Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
if (S == 0 && memcmp(g.ColorEditLastActiveColor, col, sizeof(float) * 3) == 0)
H = g.ColorEditLastHue;
}
else if (flags & ImGuiColorEditFlags_InputHSV)
ColorConvertHSVtoRGB(H, S, V, R, G, B);
@ -4628,6 +4642,8 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
if (flags & ImGuiColorEditFlags_InputRGB)
{
ColorConvertHSVtoRGB(H >= 1.0f ? H - 10 * 1e-6f : H, S > 0.0f ? S : 10*1e-6f, V > 0.0f ? V : 1e-6f, col[0], col[1], col[2]);
g.ColorEditLastHue = H;
memcpy(g.ColorEditLastActiveColor, col, sizeof(float) * 3);
}
else if (flags & ImGuiColorEditFlags_InputHSV)
{
@ -4680,7 +4696,9 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
R = col[0];
G = col[1];
B = col[2];
float preserve_hue = H;
ColorConvertRGBtoHSV(R, G, B, H, S, V);
H = preserve_hue; // Avoids picker losing hue value for 1 frame glitch.
}
else if (flags & ImGuiColorEditFlags_InputHSV)
{