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Texture-based round corners: Moved RenderResizeGripWithTex to RenderWindowResizeGrip

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This commit is contained in:
ocornut 2020-06-03 21:29:05 +02:00
parent 5947842934
commit 05d9502075
3 changed files with 88 additions and 86 deletions
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87
imgui.cpp
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@ -5547,91 +5547,6 @@ static const ImGuiResizeBorderDef resize_border_def[4] =
{ ImVec2(0, -1), ImVec2(1, 1), ImVec2(0, 1), IM_PI * 0.50f } // Down
};
// Add a resize grip using the rounded corner textures, if possible.
// Returns false if rendering could not be performed, true otherwise
// FIXME: Probably ok to move this to imgui_draw.cpp in 'Internal Render Helpers' section.
static bool RenderResizeGripWithTex(ImDrawList* draw_list, const ImVec2& corner, unsigned int rad, unsigned int overall_grip_size, ImDrawCornerFlags corners_flags, ImU32 col)
{
if (!(draw_list->Flags & ImDrawListFlags_RoundCornersUseTex)) // Disabled by the draw list flags
return false;
ImFontAtlas* atlas = draw_list->_Data->Font->ContainerAtlas;
IM_ASSERT(atlas->TexID == draw_list->_TextureIdStack.back()); // Use high-level ImGui::PushFont() or low-level ImDrawList::PushTextureId() to change font.
IM_ASSERT(ImIsPowerOfTwo(corners_flags)); // Only allow a single corner to be specified here.
IM_ASSERT_PARANOID(!(atlas->Flags & ImFontAtlasFlags_NoBakedRoundCorners));
if (rad < 1 || rad > ImFontAtlasRoundCornersMaxSize) // Radius 0 will cause issues with the UV lookup below
return false;
// Calculate UVs for the three points we are interested in from the texture
// uv[0] is the mid-point from the corner towards the center of the circle (solid)
// uv[1] is a solid point on the edge of the circle
// uv[2] is the outer edge (blank, outside the circle)
const ImVec4& uvs = (*draw_list->_Data->TexRoundCornerData)[rad - 1].TexUvFilled;
const ImVec2 uv[] =
{
ImVec2(ImLerp(uvs.x, uvs.z, 0.5f), ImLerp(uvs.y, uvs.w, 0.5f)),
ImVec2(uvs.x, uvs.y),
ImVec2(uvs.z, uvs.w),
};
// Calculate the coordinates of the points at the inside of the rounded area of the corner, and the outside of the grip on the X/Y axes
ImVec2 in_x = corner, in_y = corner, out_x = corner, out_y = corner;
if (corners_flags & (ImDrawFlags_RoundCornersTopLeft | ImDrawFlags_RoundCornersTopRight))
{
in_y.y += rad;
out_y.y += overall_grip_size;
}
else if (corners_flags & (ImDrawFlags_RoundCornersBottomLeft | ImDrawFlags_RoundCornersBottomRight))
{
in_y.y -= rad;
out_y.y -= overall_grip_size;
}
if (corners_flags & (ImDrawFlags_RoundCornersTopLeft | ImDrawFlags_RoundCornersBottomLeft))
{
in_x.x += rad;
out_x.x += overall_grip_size;
}
else if (corners_flags & (ImDrawFlags_RoundCornersTopRight | ImDrawFlags_RoundCornersBottomRight))
{
in_x.x -= rad;
out_x.x -= overall_grip_size;
}
// Calculate the mid-point on the diagonal
const ImVec2 mid = ImVec2(ImLerp(in_x.x, in_y.x, 0.5f), ImLerp(in_x.y, in_y.y, 0.5f));
// Now write out the geometry
const int num_verts = 6; // Number of vertices we are going to write
const int num_indices = 12; // Number of indices we are going to write
draw_list->PrimReserve(num_indices, num_verts);
ImDrawIdx current_idx = (ImDrawIdx)draw_list->_VtxCurrentIdx;
ImDrawVert* vtx_write_ptr = draw_list->_VtxWritePtr;
ImDrawIdx* idx_write_ptr = draw_list->_IdxWritePtr;
vtx_write_ptr[0].pos = mid; vtx_write_ptr[0].uv = uv[0]; vtx_write_ptr[0].col = col;
vtx_write_ptr[1].pos = in_y; vtx_write_ptr[1].uv = uv[1]; vtx_write_ptr[1].col = col;
vtx_write_ptr[2].pos = corner; vtx_write_ptr[2].uv = uv[2]; vtx_write_ptr[2].col = col;
vtx_write_ptr[3].pos = in_x; vtx_write_ptr[3].uv = uv[1]; vtx_write_ptr[3].col = col;
vtx_write_ptr[4].pos = out_x; vtx_write_ptr[4].uv = uv[1]; vtx_write_ptr[4].col = col;
vtx_write_ptr[5].pos = out_y; vtx_write_ptr[5].uv = uv[1]; vtx_write_ptr[5].col = col;
// Curved section
idx_write_ptr[0] = current_idx; idx_write_ptr[1] = (ImDrawIdx)(current_idx + 1); idx_write_ptr[2] = (ImDrawIdx)(current_idx + 2);
idx_write_ptr[3] = current_idx; idx_write_ptr[4] = (ImDrawIdx)(current_idx + 2); idx_write_ptr[5] = (ImDrawIdx)(current_idx + 3);
// Outer section
idx_write_ptr[6] = (ImDrawIdx)(current_idx + 4); idx_write_ptr[7] = (ImDrawIdx)(current_idx + 3); idx_write_ptr[8] = (ImDrawIdx)(current_idx + 5);
idx_write_ptr[9] = (ImDrawIdx)(current_idx + 3); idx_write_ptr[10] = (ImDrawIdx)(current_idx + 5); idx_write_ptr[11] = (ImDrawIdx)(current_idx + 1);
draw_list->_VtxWritePtr += num_verts;
draw_list->_VtxCurrentIdx += num_verts;
draw_list->_IdxWritePtr += num_indices;
return true;
}
static ImRect GetResizeBorderRect(ImGuiWindow* window, int border_n, float perp_padding, float thickness)
{
ImRect rect = window->Rect();
@ -5910,7 +5825,7 @@ void ImGui::RenderWindowDecorations(ImGuiWindow* window, const ImRect& title_bar
grip_corner.y += grip.InnerDir.y * window_border_size;
// Try and use a rounded texture to draw the grip
if (!RenderResizeGripWithTex(window->DrawList, grip_corner, (unsigned int)window_rounding, (unsigned int)(resize_grip_draw_size - window_border_size), grip.CornerFlags, resize_grip_col[resize_grip_n]))
if (!RenderWindowResizeGrip(window->DrawList, grip_corner, (unsigned int)window_rounding, (unsigned int)(resize_grip_draw_size - window_border_size), grip.CornerFlags, resize_grip_col[resize_grip_n]))
{
// Fall back to using geometry to draw the whole grip if texture-based draw failed
window->DrawList->PathLineTo(corner + grip.InnerDir * ((resize_grip_n & 1) ? ImVec2(window_border_size, resize_grip_draw_size) : ImVec2(resize_grip_draw_size, window_border_size)));

86
imgui_draw.cpp
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@ -4510,6 +4510,7 @@ void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
// - RenderArrowPointingAt()
// - RenderRectFilledRangeH()
// - RenderRectFilledWithHole()
// - RenderWindowResizeGrip()
//-----------------------------------------------------------------------------
// Function in need of a redesign (legacy mess)
// - RenderColorRectWithAlphaCheckerboard()
@ -4665,6 +4666,91 @@ void ImGui::RenderRectFilledWithHole(ImDrawList* draw_list, ImRect outer, ImRect
if (fill_R && fill_D) draw_list->AddRectFilled(ImVec2(inner.Max.x, inner.Max.y), ImVec2(outer.Max.x, outer.Max.y), col, rounding, ImDrawFlags_RoundCornersBottomRight);
}
// Add a resize grip using the rounded corner textures, if possible.
// Returns false if rendering could not be performed, true otherwise
// FIXME: Probably ok to move this to imgui_draw.cpp in 'Internal Render Helpers' section.
bool ImGui::RenderWindowResizeGrip(ImDrawList* draw_list, const ImVec2& corner, unsigned int rad, unsigned int overall_grip_size, ImDrawFlags flags, ImU32 col)
{
// Texture path disabled by the draw list flags
// Texture path disabled for radius 0 which cause issues with the UV lookup below
const bool use_tex = (draw_list->Flags & ImDrawListFlags_RoundCornersUseTex) && (rad >= 1 && rad <= ImFontAtlasRoundCornersMaxSize);
if (use_tex == false)
return false;
ImFontAtlas* atlas = draw_list->_Data->Font->ContainerAtlas;
IM_ASSERT(atlas->TexID == draw_list->_TextureIdStack.back()); // Use high-level ImGui::PushFont() or low-level ImDrawList::PushTextureId() to change font.
IM_ASSERT(ImIsPowerOfTwo(flags)); // Only allow a single corner to be specified here.
IM_ASSERT_PARANOID((atlas->Flags & ImFontAtlasFlags_NoBakedRoundCorners) == 0);
// Calculate UVs for the three points we are interested in from the texture
// - uv[0] is the mid-point from the corner towards the center of the circle (solid)
// - uv[1] is a solid point on the edge of the circle
// - uv[2] is the outer edge (blank, outside the circle)
const ImVec4& uvs = (*draw_list->_Data->TexRoundCornerData)[rad - 1].TexUvFilled;
const ImVec2 uv[] =
{
ImVec2(ImLerp(uvs.x, uvs.z, 0.5f), ImLerp(uvs.y, uvs.w, 0.5f)),
ImVec2(uvs.x, uvs.y),
ImVec2(uvs.z, uvs.w),
};
// Calculate the coordinates of the points at the inside of the rounded area of the corner, and the outside of the grip on the X/Y axes
ImVec2 in_x = corner, in_y = corner, out_x = corner, out_y = corner;
if (flags & (ImDrawFlags_RoundCornersTopLeft | ImDrawFlags_RoundCornersTopRight))
{
in_y.y += rad;
out_y.y += overall_grip_size;
}
else if (flags & (ImDrawFlags_RoundCornersBottomLeft | ImDrawFlags_RoundCornersBottomRight))
{
in_y.y -= rad;
out_y.y -= overall_grip_size;
}
if (flags & (ImDrawFlags_RoundCornersTopLeft | ImDrawFlags_RoundCornersBottomLeft))
{
in_x.x += rad;
out_x.x += overall_grip_size;
}
else if (flags & (ImDrawFlags_RoundCornersTopRight | ImDrawFlags_RoundCornersBottomRight))
{
in_x.x -= rad;
out_x.x -= overall_grip_size;
}
// Calculate the mid-point on the diagonal
const ImVec2 mid = ImVec2(ImLerp(in_x.x, in_y.x, 0.5f), ImLerp(in_x.y, in_y.y, 0.5f));
// Now write out the geometry
const int num_verts = 6; // Number of vertices we are going to write
const int num_indices = 12; // Number of indices we are going to write
draw_list->PrimReserve(num_indices, num_verts);
unsigned int idx = draw_list->_VtxCurrentIdx;
ImDrawVert* vtx_write_ptr = draw_list->_VtxWritePtr;
ImDrawIdx* idx_write_ptr = draw_list->_IdxWritePtr;
vtx_write_ptr[0].pos = mid; vtx_write_ptr[0].uv = uv[0]; vtx_write_ptr[0].col = col;
vtx_write_ptr[1].pos = in_y; vtx_write_ptr[1].uv = uv[1]; vtx_write_ptr[1].col = col;
vtx_write_ptr[2].pos = corner; vtx_write_ptr[2].uv = uv[2]; vtx_write_ptr[2].col = col;
vtx_write_ptr[3].pos = in_x; vtx_write_ptr[3].uv = uv[1]; vtx_write_ptr[3].col = col;
vtx_write_ptr[4].pos = out_x; vtx_write_ptr[4].uv = uv[1]; vtx_write_ptr[4].col = col;
vtx_write_ptr[5].pos = out_y; vtx_write_ptr[5].uv = uv[1]; vtx_write_ptr[5].col = col;
// Curved section
idx_write_ptr[0] = (ImDrawIdx)(idx); idx_write_ptr[1] = (ImDrawIdx)(idx + 1); idx_write_ptr[2] = (ImDrawIdx)(idx + 2);
idx_write_ptr[3] = (ImDrawIdx)(idx); idx_write_ptr[4] = (ImDrawIdx)(idx + 2); idx_write_ptr[5] = (ImDrawIdx)(idx + 3);
// Outer section
idx_write_ptr[6] = (ImDrawIdx)(idx + 4); idx_write_ptr[7] = (ImDrawIdx)(idx + 3); idx_write_ptr[8] = (ImDrawIdx)(idx + 5);
idx_write_ptr[9] = (ImDrawIdx)(idx + 3); idx_write_ptr[10] = (ImDrawIdx)(idx + 5); idx_write_ptr[11] = (ImDrawIdx)(idx + 1);
draw_list->_VtxWritePtr += num_verts;
draw_list->_VtxCurrentIdx += num_verts;
draw_list->_IdxWritePtr += num_indices;
return true;
}
// Helper for ColorPicker4()
// NB: This is rather brittle and will show artifact when rounding this enabled if rounded corners overlap multiple cells. Caller currently responsible for avoiding that.
// Spent a non reasonable amount of time trying to getting this right for ColorButton with rounding+anti-aliasing+ImGuiColorEditFlags_HalfAlphaPreview flag + various grid sizes and offsets, and eventually gave up... probably more reasonable to disable rounding altogether.

1
imgui_internal.h
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@ -2773,6 +2773,7 @@ namespace ImGui
IMGUI_API void RenderBullet(ImDrawList* draw_list, ImVec2 pos, ImU32 col);
IMGUI_API void RenderCheckMark(ImDrawList* draw_list, ImVec2 pos, ImU32 col, float sz);
IMGUI_API void RenderArrowPointingAt(ImDrawList* draw_list, ImVec2 pos, ImVec2 half_sz, ImGuiDir direction, ImU32 col);
IMGUI_API bool RenderWindowResizeGrip(ImDrawList* draw_list, const ImVec2& corner, unsigned int rad, unsigned int overall_grip_size, ImDrawFlags flags, ImU32 col);
IMGUI_API void RenderRectFilledRangeH(ImDrawList* draw_list, const ImRect& rect, ImU32 col, float x_start_norm, float x_end_norm, float rounding);
IMGUI_API void RenderRectFilledWithHole(ImDrawList* draw_list, ImRect outer, ImRect inner, ImU32 col, float rounding);