Reserve space for a number of vertices and indices. You must finish filling your reserved data before calling PrimReserve() again, as it may reallocate or submit the intermediate results. PrimUnreserve() can be used to release unused allocations.
| 614 | // You must finish filling your reserved data before calling PrimReserve() again, as it may reallocate or |
| 615 | // submit the intermediate results. PrimUnreserve() can be used to release unused allocations. |
| 616 | void ImDrawList::PrimReserve(int idx_count, int vtx_count) |
| 617 | { |
| 618 | // Large mesh support (when enabled) |
| 619 | IM_ASSERT_PARANOID(idx_count >= 0 && vtx_count >= 0); |
| 620 | if (sizeof(ImDrawIdx) == 2 && (_VtxCurrentIdx + vtx_count >= (1 << 16)) && (Flags & ImDrawListFlags_AllowVtxOffset)) |
| 621 | { |
| 622 | // FIXME: In theory we should be testing that vtx_count <64k here. |
| 623 | // In practice, RenderText() relies on reserving ahead for a worst case scenario so it is currently useful for us |
| 624 | // to not make that check until we rework the text functions to handle clipping and large horizontal lines better. |
| 625 | _CmdHeader.VtxOffset = VtxBuffer.Size; |
| 626 | _OnChangedVtxOffset(); |
| 627 | } |
| 628 | |
| 629 | ImDrawCmd* draw_cmd = &CmdBuffer.Data[CmdBuffer.Size - 1]; |
| 630 | draw_cmd->ElemCount += idx_count; |
| 631 | |
| 632 | int vtx_buffer_old_size = VtxBuffer.Size; |
| 633 | VtxBuffer.resize(vtx_buffer_old_size + vtx_count); |
| 634 | _VtxWritePtr = VtxBuffer.Data + vtx_buffer_old_size; |
| 635 | |
| 636 | int idx_buffer_old_size = IdxBuffer.Size; |
| 637 | IdxBuffer.resize(idx_buffer_old_size + idx_count); |
| 638 | _IdxWritePtr = IdxBuffer.Data + idx_buffer_old_size; |
| 639 | } |
| 640 | |
| 641 | // Release the a number of reserved vertices/indices from the end of the last reservation made with PrimReserve(). |
| 642 | void ImDrawList::PrimUnreserve(int idx_count, int vtx_count) |
no test coverage detected