static bool verify_query(SkRect query, SkRect rects[], SkTDArray<int>& found) {
SkTDArray<int> expected;
// manually intersect with every rectangle
for (int i = 0; i < NUM_RECTS; ++i) {
if (SkRect::Intersects(query, rects[i])) {
expected.push_back(i);
}
}
if (expected.count() != found.count()) {
return false;
}
if (0 == expected.count()) {
return true;
}
return found == expected;
}
void ImGuiLayer::onPaint(SkSurface* surface) {
// This causes ImGui to rebuild vertex/index data based on all immediate-mode commands
// (widgets, etc...) that have been issued
ImGui::Render();
// Then we fetch the most recent data, and convert it so we can render with Skia
const ImDrawData* drawData = ImGui::GetDrawData();
SkTDArray<SkPoint> pos;
SkTDArray<SkPoint> uv;
SkTDArray<SkColor> color;
auto canvas = surface->getCanvas();
for (int i = 0; i < drawData->CmdListsCount; ++i) {
const ImDrawList* drawList = drawData->CmdLists[i];
// De-interleave all vertex data (sigh), convert to Skia types
pos.rewind(); uv.rewind(); color.rewind();
for (int j = 0; j < drawList->VtxBuffer.size(); ++j) {
const ImDrawVert& vert = drawList->VtxBuffer[j];
pos.push_back(SkPoint::Make(vert.pos.x, vert.pos.y));
uv.push_back(SkPoint::Make(vert.uv.x, vert.uv.y));
color.push_back(vert.col);
}
// ImGui colors are RGBA
SkSwapRB(color.begin(), color.begin(), color.count());
int indexOffset = 0;
// Draw everything with canvas.drawVertices...
for (int j = 0; j < drawList->CmdBuffer.size(); ++j) {
const ImDrawCmd* drawCmd = &drawList->CmdBuffer[j];
SkAutoCanvasRestore acr(canvas, true);
// TODO: Find min/max index for each draw, so we know how many vertices (sigh)
if (drawCmd->UserCallback) {
drawCmd->UserCallback(drawList, drawCmd);
} else {
intptr_t idIndex = (intptr_t)drawCmd->TextureId;
if (idIndex < fSkiaWidgetFuncs.count()) {
// Small image IDs are actually indices into a list of callbacks. We directly
// examing the vertex data to deduce the image rectangle, then reconfigure the
// canvas to be clipped and translated so that the callback code gets to use
// Skia to render a widget in the middle of an ImGui panel.
ImDrawIdx rectIndex = drawList->IdxBuffer[indexOffset];
SkPoint tl = pos[rectIndex], br = pos[rectIndex + 2];
canvas->clipRect(SkRect::MakeLTRB(tl.fX, tl.fY, br.fX, br.fY));
canvas->translate(tl.fX, tl.fY);
fSkiaWidgetFuncs[idIndex](canvas);
} else {
SkPaint* paint = static_cast<SkPaint*>(drawCmd->TextureId);
SkASSERT(paint);
canvas->clipRect(SkRect::MakeLTRB(drawCmd->ClipRect.x, drawCmd->ClipRect.y,
drawCmd->ClipRect.z, drawCmd->ClipRect.w));
auto vertices = SkVertices::MakeCopy(SkVertices::kTriangles_VertexMode,
drawList->VtxBuffer.size(),
pos.begin(), uv.begin(), color.begin(),
drawCmd->ElemCount,
drawList->IdxBuffer.begin() + indexOffset);
canvas->drawVertices(vertices, SkBlendMode::kModulate, *paint);
}
indexOffset += drawCmd->ElemCount;
}
}
}
fSkiaWidgetFuncs.reset();
}
