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ColorEdit: Fix multiple issues. (#4014)

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* Change g.ColorEditLastColor type to ImU32 and store RGB color value.
  - Fixes inability to change hue when saturation is 0. (#4014)
  - Fixes edgecases where lossy color conversion prevent restoration of hue/saturation.
  - Fixes hue value jitter when modifying color using SV square.
* Fix hue resetting to 0 when it is set to 255 by explicitly restoring hue if it is 0 and previous value was 1.
* Further reduce hue jitter by restoring hue when color is modified using SV square.
This commit is contained in:
Rokas Kupstys
2021-04-08 14:37:03 +03:00
committed by ocornut
parent 15132217a3
commit 30546bc0e7
4 changed files with 42 additions and 28 deletions
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56
imgui_widgets.cpp
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@ -4781,6 +4781,30 @@ bool ImGui::ColorEdit3(const char* label, float col[3], ImGuiColorEditFlags flag
return ColorEdit4(label, col, flags | ImGuiColorEditFlags_NoAlpha);
}
// ColorEdit supports RGB and HSV inputs. In case of RGB input resulting color may have undefined hue and/or saturation.
// Since widget displays both RGB and HSV values we must preserve hue and saturation to prevent these values resetting.
static void ColorEditRestoreHS(const float* col, float* H, float* S, float* V)
{
// This check is optional. Suppose we have two color widgets side by side, both widgets display different colors, but both colors have hue and/or saturation undefined.
// With color check: hue/saturation is preserved in one widget. Editing color in one widget would reset hue/saturation in another one.
// Without color check: common hue/saturation would be displayed in all widgets that have hue/saturation undefined.
// g.ColorEditLastColor is stored as ImU32 RGB value: this essentially gives us color equality check with reduced precision.
// Tiny external color changes would not be detected and this check would still pass. This is OK, since we only restore hue/saturation _only_ if they are undefined,
// therefore this change flipping hue/saturation from undefined to a very tiny value would still be represented in color picker.
ImGuiContext& g = *GImGui;
if (g.ColorEditLastColor != ImGui::ColorConvertFloat4ToU32(ImVec4(col[0], col[1], col[2], 0)))
return;
// When S == 0, H is undefined.
// When H == 1 it wraps around to 0.
if (*S == 0.0f || (*H == 0.0f && g.ColorEditLastHue == 1))
*H = g.ColorEditLastHue;
// When V == 0, S is undefined.
if (*V == 0.0f)
*S = g.ColorEditLastSat;
}
// Edit colors components (each component in 0.0f..1.0f range).
// See enum ImGuiColorEditFlags_ for available options. e.g. Only access 3 floats if ImGuiColorEditFlags_NoAlpha flag is set.
// With typical options: Left-click on color square to open color picker. Right-click to open option menu. CTRL-Click over input fields to edit them and TAB to go to next item.
@ -4836,13 +4860,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
{
// Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
ColorConvertRGBtoHSV(f[0], f[1], f[2], f[0], f[1], f[2]);
if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
{
if (f[1] == 0)
f[0] = g.ColorEditLastHue;
if (f[2] == 0)
f[1] = g.ColorEditLastSat;
}
ColorEditRestoreHS(col, &f[0], &f[1], &f[2]);
}
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]) };
@ -4977,7 +4995,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
g.ColorEditLastHue = f[0];
g.ColorEditLastSat = f[1];
ColorConvertHSVtoRGB(f[0], f[1], f[2], f[0], f[1], f[2]);
memcpy(g.ColorEditLastColor, f, sizeof(float) * 3);
g.ColorEditLastColor = ColorConvertFloat4ToU32(ImVec4(f[0], f[1], f[2], 0));
}
if ((flags & ImGuiColorEditFlags_DisplayRGB) && (flags & ImGuiColorEditFlags_InputHSV))
ColorConvertRGBtoHSV(f[0], f[1], f[2], f[0], f[1], f[2]);
@ -5112,13 +5130,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
{
// Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
ColorConvertRGBtoHSV(R, G, B, H, S, V);
if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
{
if (S == 0)
H = g.ColorEditLastHue;
if (V == 0)
S = g.ColorEditLastSat;
}
ColorEditRestoreHS(col, &H, &S, &V);
}
else if (flags & ImGuiColorEditFlags_InputHSV)
{
@ -5171,6 +5183,10 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
{
S = ImSaturate((io.MousePos.x - picker_pos.x) / (sv_picker_size - 1));
V = 1.0f - ImSaturate((io.MousePos.y - picker_pos.y) / (sv_picker_size - 1));
// Greatly reduces hue jitter and reset to 0 when hue == 255 and color is rapidly modified using SV square.
if (g.ColorEditLastColor == ColorConvertFloat4ToU32(ImVec4(col[0], col[1], col[2], 0)))
H = g.ColorEditLastHue;
value_changed = value_changed_sv = true;
}
if (!(flags & ImGuiColorEditFlags_NoOptions))
@ -5247,7 +5263,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
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;
g.ColorEditLastSat = S;
memcpy(g.ColorEditLastColor, col, sizeof(float) * 3);
g.ColorEditLastColor = ColorConvertFloat4ToU32(ImVec4(col[0], col[1], col[2], 0));
}
else if (flags & ImGuiColorEditFlags_InputHSV)
{
@ -5301,13 +5317,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
G = col[1];
B = col[2];
ColorConvertRGBtoHSV(R, G, B, H, S, V);
if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0) // Fix local Hue as display below will use it immediately.
{
if (S == 0)
H = g.ColorEditLastHue;
if (V == 0)
S = g.ColorEditLastSat;
}
ColorEditRestoreHS(col, &H, &S, &V); // Fix local Hue as display below will use it immediately.
}
else if (flags & ImGuiColorEditFlags_InputHSV)
{