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ImDrawList::AddPolyLine() tidying up in AA path

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This commit is contained in:
ocornut 2015-07-18 17:31:40 -06:00
parent 82727d7119
commit 479211808f
1 changed files with 22 additions and 25 deletions
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47
imgui.cpp
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@ -9264,20 +9264,15 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
const int idx_count = count*12;
const int vtx_count = points_count*3;
PrimReserve(idx_count, vtx_count);
unsigned int vtx_inner_idx = _VtxCurrentIdx+1;
unsigned int vtx_outer_idx = _VtxCurrentIdx+2;
// Temporary buffer
ImVec2* temp_inner = (ImVec2*)alloca(points_count * 3 * sizeof(ImVec2));
ImVec2* temp_outer = temp_inner + points_count;
ImVec2* temp_normals = temp_inner + points_count * 2;
ImVec2* temp_points = (ImVec2*)alloca(points_count * 3 * sizeof(ImVec2));
ImVec2* temp_normals = temp_points + points_count * 2;
for (int i1 = 0; i1 < count; i1++)
{
const int i2 = (i1+1) == points_count ? 0 : i1+1;
const ImVec2& p1 = points[i1];
const ImVec2& p2 = points[i2];
ImVec2 diff = p2 - p1;
ImVec2 diff = points[i2] - points[i1];
diff *= ImInvLength(diff, 1.0f);
temp_normals[i1].x = diff.y;
temp_normals[i1].y = -diff.x;
@ -9286,21 +9281,21 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
if (!closed)
{
temp_normals[points_count-1] = temp_normals[points_count-2];
temp_outer[0] = points[0] + temp_normals[0] * AA_SIZE;
temp_inner[0] = points[0] - temp_normals[0] * AA_SIZE;
temp_outer[points_count-1] = points[points_count-1] + temp_normals[points_count-1] * AA_SIZE;
temp_inner[points_count-1] = points[points_count-1] - temp_normals[points_count-1] * AA_SIZE;
temp_points[0] = points[0] + temp_normals[0] * AA_SIZE;
temp_points[1] = points[0] - temp_normals[0] * AA_SIZE;
temp_points[(points_count-1)*2+0] = points[points_count-1] + temp_normals[points_count-1] * AA_SIZE;
temp_points[(points_count-1)*2+1] = points[points_count-1] - temp_normals[points_count-1] * AA_SIZE;
}
// FIXME-OPT: Merge the different loops, possibly remove the temporary buffer.
unsigned int idx1 = _VtxCurrentIdx;
for (int i1 = 0; i1 < count; i1++)
{
const int i2 = (i1+1) == points_count ? 0 : i1+1;
const int i2 = (i1+1) == points_count ? 0 : i1+1;
unsigned int idx2 = (i1+1) == points_count ? _VtxCurrentIdx : idx1+3;
// Average normals
const ImVec2& n1 = temp_normals[i1];
const ImVec2& n2 = temp_normals[i2];
ImVec2 dm = (n1 + n2) * 0.5f;
ImVec2 dm = (temp_normals[i1] + temp_normals[i2]) * 0.5f;
float dmr2 = dm.x*dm.x + dm.y*dm.y;
if (dmr2 > 0.000001f)
{
@ -9309,23 +9304,25 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
dm *= scale;
}
dm *= AA_SIZE;
temp_outer[i2] = points[i2] + dm;
temp_inner[i2] = points[i2] - dm;
temp_points[i2*2+0] = points[i2] + dm;
temp_points[i2*2+1] = points[i2] - dm;
// Add indexes
_IdxWritePtr[0] = (ImDrawIdx)(_VtxCurrentIdx + i2*3); _IdxWritePtr[1] = (ImDrawIdx)(_VtxCurrentIdx + i1*3); _IdxWritePtr[2] = (ImDrawIdx)(vtx_outer_idx + i1*3);
_IdxWritePtr[3] = (ImDrawIdx)(vtx_outer_idx + i1*3); _IdxWritePtr[4] = (ImDrawIdx)(vtx_outer_idx + i2*3); _IdxWritePtr[5] = (ImDrawIdx)(_VtxCurrentIdx + i2*3);
_IdxWritePtr[6] = (ImDrawIdx)(vtx_inner_idx + i2*3); _IdxWritePtr[7] = (ImDrawIdx)(vtx_inner_idx + i1*3); _IdxWritePtr[8] = (ImDrawIdx)(_VtxCurrentIdx + i1*3);
_IdxWritePtr[9] = (ImDrawIdx)(_VtxCurrentIdx + i1*3); _IdxWritePtr[10]= (ImDrawIdx)(_VtxCurrentIdx + i2*3); _IdxWritePtr[11]= (ImDrawIdx)(vtx_inner_idx + i2*3);
_IdxWritePtr[0] = (ImDrawIdx)(idx2+0); _IdxWritePtr[1] = (ImDrawIdx)(idx1+0); _IdxWritePtr[2] = (ImDrawIdx)(idx1+2);
_IdxWritePtr[3] = (ImDrawIdx)(idx1+2); _IdxWritePtr[4] = (ImDrawIdx)(idx2+2); _IdxWritePtr[5] = (ImDrawIdx)(idx2+0);
_IdxWritePtr[6] = (ImDrawIdx)(idx2+1); _IdxWritePtr[7] = (ImDrawIdx)(idx1+1); _IdxWritePtr[8] = (ImDrawIdx)(idx1+0);
_IdxWritePtr[9] = (ImDrawIdx)(idx1+0); _IdxWritePtr[10]= (ImDrawIdx)(idx2+0); _IdxWritePtr[11]= (ImDrawIdx)(idx2+1);
_IdxWritePtr += 12;
idx1 = idx2;
}
// Add vertexes
for (int i = 0; i < points_count; i++)
{
_VtxWritePtr[0].pos = points[i]; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
_VtxWritePtr[1].pos = temp_inner[i]; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col_trans;
_VtxWritePtr[2].pos = temp_outer[i]; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col_trans;
_VtxWritePtr[0].pos = points[i]; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
_VtxWritePtr[1].pos = temp_points[i*2+0]; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col_trans;
_VtxWritePtr[2].pos = temp_points[i*2+1]; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col_trans;
_VtxWritePtr += 3;
}
_VtxCurrentIdx += (ImDrawIdx)vtx_count;