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imgui_draw.cpp
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// ImGui library v1.45 WIP
// Drawing and font code
// Contains implementation for
// - ImDrawList
// - ImDrawData
// - ImFontAtlas
// - ImFont
// - Default font data
#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
#define _CRT_SECURE_NO_WARNINGS
#endif
#include "imgui.h"
#define IMGUI_DEFINE_MATH_OPERATORS
#include "imgui_internal.h"
#include <stdio.h> // vsnprintf, sscanf, printf
#include <new> // new (ptr)
#ifndef alloca
#if _WIN32
#include <malloc.h> // alloca
#else
#include <alloca.h> // alloca
#endif
#endif
#ifdef _MSC_VER
#pragma warning (disable: 4505) // unreferenced local function has been removed (stb stuff)
#pragma warning (disable: 4996) // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
#define snprintf _snprintf
#endif
#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wunused-function" // warning: 'xxxx' defined but not used
#endif
//-------------------------------------------------------------------------
// STB libraries implementation
//-------------------------------------------------------------------------
//#define IMGUI_STB_NAMESPACE ImGuiStb
//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
//#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
#ifdef IMGUI_STB_NAMESPACE
namespace IMGUI_STB_NAMESPACE
{
#endif
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-function"
#pragma clang diagnostic ignored "-Wmissing-prototypes"
#endif
#define STBRP_ASSERT(x) IM_ASSERT(x)
#ifndef IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
#define STBRP_STATIC
#define STB_RECT_PACK_IMPLEMENTATION
#endif
#include "stb_rect_pack.h"
#define STBTT_malloc(x,u) ((void)(u), ImGui::MemAlloc(x))
#define STBTT_free(x,u) ((void)(u), ImGui::MemFree(x))
#define STBTT_assert(x) IM_ASSERT(x)
#ifndef IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
#define STBTT_STATIC
#define STB_TRUETYPE_IMPLEMENTATION
#else
#define STBTT_DEF extern
#endif
#include "stb_truetype.h"
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#ifdef IMGUI_STB_NAMESPACE
} // namespace ImGuiStb
using namespace IMGUI_STB_NAMESPACE;
#endif
//-----------------------------------------------------------------------------
// ImDrawList
//-----------------------------------------------------------------------------
static ImVec4 GNullClipRect(-9999.0f,-9999.0f, +9999.0f, +9999.0f);
void ImDrawList::Clear()
{
CmdBuffer.resize(0);
IdxBuffer.resize(0);
VtxBuffer.resize(0);
_VtxCurrentIdx = 0;
_VtxWritePtr = NULL;
_IdxWritePtr = NULL;
_ClipRectStack.resize(0);
_TextureIdStack.resize(0);
_Path.resize(0);
_ChannelCurrent = 0;
// NB: Do not clear channels so our allocations are re-used after the first frame.
}
void ImDrawList::ClearFreeMemory()
{
CmdBuffer.clear();
IdxBuffer.clear();
VtxBuffer.clear();
_VtxCurrentIdx = 0;
_VtxWritePtr = NULL;
_IdxWritePtr = NULL;
_ClipRectStack.clear();
_TextureIdStack.clear();
_Path.clear();
_ChannelCurrent = 0;
for (int i = 0; i < _Channels.Size; i++)
{
if (i == 0) memset(&_Channels[0], 0, sizeof(_Channels[0])); // channel 0 is a copy of CmdBuffer/IdxBuffer, don't destruct again
_Channels[i].CmdBuffer.clear();
_Channels[i].IdxBuffer.clear();
}
_Channels.clear();
}
void ImDrawList::AddDrawCmd()
{
ImDrawCmd draw_cmd;
draw_cmd.ElemCount = 0;
draw_cmd.ClipRect = _ClipRectStack.Size ? _ClipRectStack.back() : GNullClipRect;
draw_cmd.TextureId = _TextureIdStack.Size ? _TextureIdStack.back() : NULL;
draw_cmd.UserCallback = NULL;
draw_cmd.UserCallbackData = NULL;
IM_ASSERT(draw_cmd.ClipRect.x <= draw_cmd.ClipRect.z && draw_cmd.ClipRect.y <= draw_cmd.ClipRect.w);
CmdBuffer.push_back(draw_cmd);
}
void ImDrawList::AddCallback(ImDrawCallback callback, void* callback_data)
{
ImDrawCmd* current_cmd = CmdBuffer.Size ? &CmdBuffer.back() : NULL;
if (!current_cmd || current_cmd->ElemCount != 0 || current_cmd->UserCallback != NULL)
{
AddDrawCmd();
current_cmd = &CmdBuffer.back();
}
current_cmd->UserCallback = callback;
current_cmd->UserCallbackData = callback_data;
// Force a new command after us (we function this way so that the most common calls AddLine, AddRect, etc. always have a command to add to without doing any check).
AddDrawCmd();
}
void ImDrawList::ChannelsSplit(int channel_count)
{
IM_ASSERT(_ChannelCurrent == 0);
int old_channels_count = _Channels.Size;
if (old_channels_count < channel_count)
_Channels.resize(channel_count);
for (int i = 0; i < channel_count; i++)
if (i >= old_channels_count)
new(&_Channels[i]) ImDrawChannel();
else
_Channels[i].CmdBuffer.resize(0), _Channels[i].IdxBuffer.resize(0);
}
void ImDrawList::ChannelsMerge(int channel_count)
{
// Note that we never use or rely on channels.Size because it is merely a buffer that we never shrink back to 0 to keep all sub-buffers ready for use.
// This is why this function takes 'channel_count' as a parameter of how many channels to merge (the user knows)
if (channel_count < 2)
return;
ChannelsSetCurrent(0);
if (CmdBuffer.Size && CmdBuffer.back().ElemCount == 0)
CmdBuffer.pop_back();
int new_cmd_buffer_count = 0, new_idx_buffer_count = 0;
for (int i = 1; i < channel_count; i++)
{
ImDrawChannel& ch = _Channels[i];
if (ch.CmdBuffer.Size && ch.CmdBuffer.back().ElemCount == 0)
ch.CmdBuffer.pop_back();
new_cmd_buffer_count += ch.CmdBuffer.Size;
new_idx_buffer_count += ch.IdxBuffer.Size;
}
CmdBuffer.resize(CmdBuffer.Size + new_cmd_buffer_count);
IdxBuffer.resize(IdxBuffer.Size + new_idx_buffer_count);
ImDrawCmd* cmd_write = CmdBuffer.Data + CmdBuffer.Size - new_cmd_buffer_count;
_IdxWritePtr = IdxBuffer.Data + IdxBuffer.Size - new_idx_buffer_count;
for (int i = 1; i < channel_count; i++)
{
ImDrawChannel& ch = _Channels[i];
if (int sz = ch.CmdBuffer.Size) { memcpy(cmd_write, ch.CmdBuffer.Data, sz * sizeof(ImDrawCmd)); cmd_write += sz; }
if (int sz = ch.IdxBuffer.Size) { memcpy(_IdxWritePtr, ch.IdxBuffer.Data, sz * sizeof(ImDrawIdx)); _IdxWritePtr += sz; }
}
AddDrawCmd();
}
void ImDrawList::ChannelsSetCurrent(int idx)
{
if (_ChannelCurrent == idx) return;
memcpy(&_Channels.Data[_ChannelCurrent].CmdBuffer, &CmdBuffer, sizeof(CmdBuffer));
memcpy(&_Channels.Data[_ChannelCurrent].IdxBuffer, &IdxBuffer, sizeof(IdxBuffer));
_ChannelCurrent = idx;
memcpy(&CmdBuffer, &_Channels.Data[_ChannelCurrent].CmdBuffer, sizeof(CmdBuffer));
memcpy(&IdxBuffer, &_Channels.Data[_ChannelCurrent].IdxBuffer, sizeof(IdxBuffer));
_IdxWritePtr = IdxBuffer.Data + IdxBuffer.Size;
}
void ImDrawList::UpdateClipRect()
{
ImDrawCmd* current_cmd = CmdBuffer.Size ? &CmdBuffer.back() : NULL;
if (!current_cmd || (current_cmd->ElemCount != 0) || current_cmd->UserCallback != NULL)
{
AddDrawCmd();
}
else
{
ImVec4 current_clip_rect = _ClipRectStack.Size ? _ClipRectStack.back() : GNullClipRect;
if (CmdBuffer.Size >= 2 && ImLengthSqr(CmdBuffer.Data[CmdBuffer.Size-2].ClipRect - current_clip_rect) < 0.00001f)
CmdBuffer.pop_back();
else
current_cmd->ClipRect = current_clip_rect;
}
}
// Scissoring. The values in clip_rect are x1, y1, x2, y2.
void ImDrawList::PushClipRect(const ImVec4& clip_rect)
{
_ClipRectStack.push_back(clip_rect);
UpdateClipRect();
}
void ImDrawList::PushClipRectFullScreen()
{
PushClipRect(GNullClipRect);
// This would be more correct but we're not supposed to access ImGuiState from here?
//ImGuiState& g = *GImGui;
//PushClipRect(GetVisibleRect());
}
void ImDrawList::PopClipRect()
{
IM_ASSERT(_ClipRectStack.Size > 0);
_ClipRectStack.pop_back();
UpdateClipRect();
}
void ImDrawList::UpdateTextureID()
{
ImDrawCmd* current_cmd = CmdBuffer.Size ? &CmdBuffer.back() : NULL;
const ImTextureID texture_id = _TextureIdStack.Size ? _TextureIdStack.back() : NULL;
if (!current_cmd || (current_cmd->ElemCount != 0 && current_cmd->TextureId != texture_id) || current_cmd->UserCallback != NULL)
AddDrawCmd();
else
current_cmd->TextureId = texture_id;
}
void ImDrawList::PushTextureID(const ImTextureID& texture_id)
{
_TextureIdStack.push_back(texture_id);
UpdateTextureID();
}
void ImDrawList::PopTextureID()
{
IM_ASSERT(_TextureIdStack.Size > 0);
_TextureIdStack.pop_back();
UpdateTextureID();
}
// NB: this can be called with negative count for removing primitives (as long as the result does not underflow)
void ImDrawList::PrimReserve(int idx_count, int vtx_count)
{
ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size-1];
draw_cmd.ElemCount += idx_count;
int vtx_buffer_size = VtxBuffer.Size;
VtxBuffer.resize(vtx_buffer_size + vtx_count);
_VtxWritePtr = VtxBuffer.Data + vtx_buffer_size;
int idx_buffer_size = IdxBuffer.Size;
IdxBuffer.resize(idx_buffer_size + idx_count);
_IdxWritePtr = IdxBuffer.Data + idx_buffer_size;
}
void ImDrawList::PrimRect(const ImVec2& a, const ImVec2& c, ImU32 col)
{
const ImVec2 uv = GImGui->FontTexUvWhitePixel;
const ImVec2 b(c.x, a.y);
const ImVec2 d(a.x, c.y);
_IdxWritePtr[0] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[1] = (ImDrawIdx)(_VtxCurrentIdx+1); _IdxWritePtr[2] = (ImDrawIdx)(_VtxCurrentIdx+2);
_IdxWritePtr[3] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[4] = (ImDrawIdx)(_VtxCurrentIdx+2); _IdxWritePtr[5] = (ImDrawIdx)(_VtxCurrentIdx+3);
_VtxWritePtr[0].pos = a; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
_VtxWritePtr[1].pos = b; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col;
_VtxWritePtr[2].pos = c; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col;
_VtxWritePtr[3].pos = d; _VtxWritePtr[3].uv = uv; _VtxWritePtr[3].col = col;
_VtxWritePtr += 4;
_VtxCurrentIdx += 4;
_IdxWritePtr += 6;
}
void ImDrawList::PrimRectUV(const ImVec2& a, const ImVec2& c, const ImVec2& uv_a, const ImVec2& uv_c, ImU32 col)
{
const ImVec2 b(c.x, a.y);
const ImVec2 d(a.x, c.y);
const ImVec2 uv_b(uv_c.x, uv_a.y);
const ImVec2 uv_d(uv_a.x, uv_c.y);
_IdxWritePtr[0] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[1] = (ImDrawIdx)(_VtxCurrentIdx+1); _IdxWritePtr[2] = (ImDrawIdx)(_VtxCurrentIdx+2);
_IdxWritePtr[3] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[4] = (ImDrawIdx)(_VtxCurrentIdx+2); _IdxWritePtr[5] = (ImDrawIdx)(_VtxCurrentIdx+3);
_VtxWritePtr[0].pos = a; _VtxWritePtr[0].uv = uv_a; _VtxWritePtr[0].col = col;
_VtxWritePtr[1].pos = b; _VtxWritePtr[1].uv = uv_b; _VtxWritePtr[1].col = col;
_VtxWritePtr[2].pos = c; _VtxWritePtr[2].uv = uv_c; _VtxWritePtr[2].col = col;
_VtxWritePtr[3].pos = d; _VtxWritePtr[3].uv = uv_d; _VtxWritePtr[3].col = col;
_VtxWritePtr += 4;
_VtxCurrentIdx += 4;
_IdxWritePtr += 6;
}
// TODO: Thickness anti-aliased lines cap are missing their AA fringe.
void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32 col, bool closed, float thickness, bool anti_aliased)
{
if (points_count < 2)
return;
const ImVec2 uv = GImGui->FontTexUvWhitePixel;
anti_aliased &= GImGui->Style.AntiAliasedLines;
//if (ImGui::GetIO().KeyCtrl) anti_aliased = false;
int count = points_count;
if (!closed)
count = points_count-1;
const bool thick_line = thickness > 1.0f;
if (anti_aliased)
{
// Anti-aliased stroke
const float AA_SIZE = 1.0f;
const ImU32 col_trans = col & 0x00ffffff;
const int idx_count = thick_line ? count*18 : count*12;
const int vtx_count = thick_line ? points_count*4 : points_count*3;
PrimReserve(idx_count, vtx_count);
// Temporary buffer
ImVec2* temp_normals = (ImVec2*)alloca(points_count * (thick_line ? 5 : 3) * sizeof(ImVec2));
ImVec2* temp_points = temp_normals + points_count;
for (int i1 = 0; i1 < count; i1++)
{
const int i2 = (i1+1) == points_count ? 0 : i1+1;
ImVec2 diff = points[i2] - points[i1];
diff *= ImInvLength(diff, 1.0f);
temp_normals[i1].x = diff.y;
temp_normals[i1].y = -diff.x;
}
if (!closed)
temp_normals[points_count-1] = temp_normals[points_count-2];
if (!thick_line)
{
if (!closed)
{
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;
unsigned int idx2 = (i1+1) == points_count ? _VtxCurrentIdx : idx1+3;
// Average normals
ImVec2 dm = (temp_normals[i1] + temp_normals[i2]) * 0.5f;
float dmr2 = dm.x*dm.x + dm.y*dm.y;
if (dmr2 > 0.000001f)
{
float scale = 1.0f / dmr2;
if (scale > 100.0f) scale = 100.0f;
dm *= scale;
}
dm *= AA_SIZE;
temp_points[i2*2+0] = points[i2] + dm;
temp_points[i2*2+1] = points[i2] - dm;
// Add indexes
_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_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;
}
}
else
{
const float half_inner_thickness = (thickness - AA_SIZE) * 0.5f;
if (!closed)
{
temp_points[0] = points[0] + temp_normals[0] * (half_inner_thickness + AA_SIZE);
temp_points[1] = points[0] + temp_normals[0] * (half_inner_thickness);
temp_points[2] = points[0] - temp_normals[0] * (half_inner_thickness);
temp_points[3] = points[0] - temp_normals[0] * (half_inner_thickness + AA_SIZE);
temp_points[(points_count-1)*4+0] = points[points_count-1] + temp_normals[points_count-1] * (half_inner_thickness + AA_SIZE);
temp_points[(points_count-1)*4+1] = points[points_count-1] + temp_normals[points_count-1] * (half_inner_thickness);
temp_points[(points_count-1)*4+2] = points[points_count-1] - temp_normals[points_count-1] * (half_inner_thickness);
temp_points[(points_count-1)*4+3] = points[points_count-1] - temp_normals[points_count-1] * (half_inner_thickness + 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;
unsigned int idx2 = (i1+1) == points_count ? _VtxCurrentIdx : idx1+4;
// Average normals
ImVec2 dm = (temp_normals[i1] + temp_normals[i2]) * 0.5f;
float dmr2 = dm.x*dm.x + dm.y*dm.y;
if (dmr2 > 0.000001f)
{
float scale = 1.0f / dmr2;
if (scale > 100.0f) scale = 100.0f;
dm *= scale;
}
ImVec2 dm_out = dm * (half_inner_thickness + AA_SIZE);
ImVec2 dm_in = dm * half_inner_thickness;
temp_points[i2*4+0] = points[i2] + dm_out;
temp_points[i2*4+1] = points[i2] + dm_in;
temp_points[i2*4+2] = points[i2] - dm_in;
temp_points[i2*4+3] = points[i2] - dm_out;
// Add indexes
_IdxWritePtr[0] = (ImDrawIdx)(idx2+1); _IdxWritePtr[1] = (ImDrawIdx)(idx1+1); _IdxWritePtr[2] = (ImDrawIdx)(idx1+2);
_IdxWritePtr[3] = (ImDrawIdx)(idx1+2); _IdxWritePtr[4] = (ImDrawIdx)(idx2+2); _IdxWritePtr[5] = (ImDrawIdx)(idx2+1);
_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] = (ImDrawIdx)(idx2+2); _IdxWritePtr[13] = (ImDrawIdx)(idx1+2); _IdxWritePtr[14] = (ImDrawIdx)(idx1+3);
_IdxWritePtr[15] = (ImDrawIdx)(idx1+3); _IdxWritePtr[16] = (ImDrawIdx)(idx2+3); _IdxWritePtr[17] = (ImDrawIdx)(idx2+2);
_IdxWritePtr += 18;
idx1 = idx2;
}
// Add vertexes
for (int i = 0; i < points_count; i++)
{
_VtxWritePtr[0].pos = temp_points[i*4+0]; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col_trans;
_VtxWritePtr[1].pos = temp_points[i*4+1]; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col;
_VtxWritePtr[2].pos = temp_points[i*4+2]; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col;
_VtxWritePtr[3].pos = temp_points[i*4+3]; _VtxWritePtr[3].uv = uv; _VtxWritePtr[3].col = col_trans;
_VtxWritePtr += 4;
}
}
_VtxCurrentIdx += (ImDrawIdx)vtx_count;
}
else
{
// Non Anti-aliased Stroke
const int idx_count = count*6;
const int vtx_count = count*4; // FIXME-OPT: Not sharing edges
PrimReserve(idx_count, vtx_count);
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;
diff *= ImInvLength(diff, 1.0f);
const float dx = diff.x * (thickness * 0.5f);
const float dy = diff.y * (thickness * 0.5f);
_VtxWritePtr[0].pos.x = p1.x + dy; _VtxWritePtr[0].pos.y = p1.y - dx; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
_VtxWritePtr[1].pos.x = p2.x + dy; _VtxWritePtr[1].pos.y = p2.y - dx; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col;
_VtxWritePtr[2].pos.x = p2.x - dy; _VtxWritePtr[2].pos.y = p2.y + dx; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col;
_VtxWritePtr[3].pos.x = p1.x - dy; _VtxWritePtr[3].pos.y = p1.y + dx; _VtxWritePtr[3].uv = uv; _VtxWritePtr[3].col = col;
_VtxWritePtr += 4;
_IdxWritePtr[0] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[1] = (ImDrawIdx)(_VtxCurrentIdx+1); _IdxWritePtr[2] = (ImDrawIdx)(_VtxCurrentIdx+2);
_IdxWritePtr[3] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[4] = (ImDrawIdx)(_VtxCurrentIdx+2); _IdxWritePtr[5] = (ImDrawIdx)(_VtxCurrentIdx+3);
_IdxWritePtr += 6;
_VtxCurrentIdx += 4;
}
}
}
void ImDrawList::AddConvexPolyFilled(const ImVec2* points, const int points_count, ImU32 col, bool anti_aliased)
{
const ImVec2 uv = GImGui->FontTexUvWhitePixel;
anti_aliased &= GImGui->Style.AntiAliasedShapes;
//if (ImGui::GetIO().KeyCtrl) anti_aliased = false;
if (anti_aliased)
{
// Anti-aliased Fill
const float AA_SIZE = 1.0f;
const ImU32 col_trans = col & 0x00ffffff;
const int idx_count = (points_count-2)*3 + points_count*6;
const int vtx_count = (points_count*2);
PrimReserve(idx_count, vtx_count);
// Add indexes for fill
unsigned int vtx_inner_idx = _VtxCurrentIdx;
unsigned int vtx_outer_idx = _VtxCurrentIdx+1;
for (int i = 2; i < points_count; i++)
{
_IdxWritePtr[0] = (ImDrawIdx)(vtx_inner_idx); _IdxWritePtr[1] = (ImDrawIdx)(vtx_inner_idx+((i-1)<<1)); _IdxWritePtr[2] = (ImDrawIdx)(vtx_inner_idx+(i<<1));
_IdxWritePtr += 3;
}
// Compute normals
ImVec2* temp_normals = (ImVec2*)alloca(points_count * sizeof(ImVec2));
for (int i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++)
{
const ImVec2& p0 = points[i0];
const ImVec2& p1 = points[i1];
ImVec2 diff = p1 - p0;
diff *= ImInvLength(diff, 1.0f);
temp_normals[i0].x = diff.y;
temp_normals[i0].y = -diff.x;
}
for (int i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++)
{
// Average normals
const ImVec2& n0 = temp_normals[i0];
const ImVec2& n1 = temp_normals[i1];
ImVec2 dm = (n0 + n1) * 0.5f;
float dmr2 = dm.x*dm.x + dm.y*dm.y;
if (dmr2 > 0.000001f)
{
float scale = 1.0f / dmr2;
if (scale > 100.0f) scale = 100.0f;
dm *= scale;
}
dm *= AA_SIZE * 0.5f;
// Add vertices
_VtxWritePtr[0].pos = (points[i1] - dm); _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col; // Inner
_VtxWritePtr[1].pos = (points[i1] + dm); _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col_trans; // Outer
_VtxWritePtr += 2;
// Add indexes for fringes
_IdxWritePtr[0] = (ImDrawIdx)(vtx_inner_idx+(i1<<1)); _IdxWritePtr[1] = (ImDrawIdx)(vtx_inner_idx+(i0<<1)); _IdxWritePtr[2] = (ImDrawIdx)(vtx_outer_idx+(i0<<1));
_IdxWritePtr[3] = (ImDrawIdx)(vtx_outer_idx+(i0<<1)); _IdxWritePtr[4] = (ImDrawIdx)(vtx_outer_idx+(i1<<1)); _IdxWritePtr[5] = (ImDrawIdx)(vtx_inner_idx+(i1<<1));
_IdxWritePtr += 6;
}
_VtxCurrentIdx += (ImDrawIdx)vtx_count;
}
else
{
// Non Anti-aliased Fill
const int idx_count = (points_count-2)*3;
const int vtx_count = points_count;
PrimReserve(idx_count, vtx_count);
for (int i = 0; i < vtx_count; i++)
{
_VtxWritePtr[0].pos = points[i]; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
_VtxWritePtr++;
}
for (int i = 2; i < points_count; i++)
{
_IdxWritePtr[0] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[1] = (ImDrawIdx)(_VtxCurrentIdx+i-1); _IdxWritePtr[2] = (ImDrawIdx)(_VtxCurrentIdx+i);
_IdxWritePtr += 3;
}
_VtxCurrentIdx += (ImDrawIdx)vtx_count;
}
}
void ImDrawList::PathArcToFast(const ImVec2& centre, float radius, int amin, int amax)
{
static ImVec2 circle_vtx[12];
static bool circle_vtx_builds = false;
const int circle_vtx_count = IM_ARRAYSIZE(circle_vtx);
if (!circle_vtx_builds)
{
for (int i = 0; i < circle_vtx_count; i++)
{
const float a = ((float)i / (float)circle_vtx_count) * 2*IM_PI;
circle_vtx[i].x = cosf(a);
circle_vtx[i].y = sinf(a);
}
circle_vtx_builds = true;
}
if (amin > amax) return;
if (radius == 0.0f)
{
_Path.push_back(centre);
}
else
{
_Path.reserve(_Path.Size + (amax - amin + 1));
for (int a = amin; a <= amax; a++)
{
const ImVec2& c = circle_vtx[a % circle_vtx_count];
_Path.push_back(ImVec2(centre.x + c.x * radius, centre.y + c.y * radius));
}
}
}
void ImDrawList::PathArcTo(const ImVec2& centre, float radius, float amin, float amax, int num_segments)
{
if (radius == 0.0f)
_Path.push_back(centre);
_Path.reserve(_Path.Size + (num_segments + 1));
for (int i = 0; i <= num_segments; i++)
{
const float a = amin + ((float)i / (float)num_segments) * (amax - amin);
_Path.push_back(ImVec2(centre.x + cosf(a) * radius, centre.y + sinf(a) * radius));
}
}
void ImDrawList::PathRect(const ImVec2& a, const ImVec2& b, float rounding, int rounding_corners)
{
float r = rounding;
r = ImMin(r, fabsf(b.x-a.x) * ( ((rounding_corners&(1|2))==(1|2)) || ((rounding_corners&(4|8))==(4|8)) ? 0.5f : 1.0f ) - 1.0f);
r = ImMin(r, fabsf(b.y-a.y) * ( ((rounding_corners&(1|8))==(1|8)) || ((rounding_corners&(2|4))==(2|4)) ? 0.5f : 1.0f ) - 1.0f);
if (r == 0.0f || rounding_corners == 0)
{
PathLineTo(a);
PathLineTo(ImVec2(b.x,a.y));
PathLineTo(b);
PathLineTo(ImVec2(a.x,b.y));
}
else
{
const float r0 = (rounding_corners & 1) ? r : 0.0f;
const float r1 = (rounding_corners & 2) ? r : 0.0f;
const float r2 = (rounding_corners & 4) ? r : 0.0f;
const float r3 = (rounding_corners & 8) ? r : 0.0f;
PathArcToFast(ImVec2(a.x+r0,a.y+r0), r0, 6, 9);
PathArcToFast(ImVec2(b.x-r1,a.y+r1), r1, 9, 12);
PathArcToFast(ImVec2(b.x-r2,b.y-r2), r2, 0, 3);
PathArcToFast(ImVec2(a.x+r3,b.y-r3), r3, 3, 6);
}
}
void ImDrawList::AddLine(const ImVec2& a, const ImVec2& b, ImU32 col, float thickness)
{
if ((col >> 24) == 0)
return;
PathLineTo(a + ImVec2(0.5f,0.5f));
PathLineTo(b + ImVec2(0.5f,0.5f));
PathStroke(col, false, thickness);
}
void ImDrawList::AddRect(const ImVec2& a, const ImVec2& b, ImU32 col, float rounding, int rounding_corners)
{
if ((col >> 24) == 0)
return;
PathRect(a + ImVec2(0.5f,0.5f), b + ImVec2(0.5f,0.5f), rounding, rounding_corners);
PathStroke(col, true);
}
void ImDrawList::AddRectFilled(const ImVec2& a, const ImVec2& b, ImU32 col, float rounding, int rounding_corners)
{
if ((col >> 24) == 0)
return;
if (rounding > 0.0f)
{
PathRect(a, b, rounding, rounding_corners);
PathFill(col);
}
else
{
PrimReserve(6, 4);
PrimRect(a, b, col);
}
}
void ImDrawList::AddRectFilledMultiColor(const ImVec2& a, const ImVec2& c, ImU32 col_upr_left, ImU32 col_upr_right, ImU32 col_bot_right, ImU32 col_bot_left)
{
if (((col_upr_left | col_upr_right | col_bot_right | col_bot_left) >> 24) == 0)
return;
const ImVec2 uv = GImGui->FontTexUvWhitePixel;
PrimReserve(6, 4);
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+1)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+2));
PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+2)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+3));
PrimWriteVtx(a, uv, col_upr_left);
PrimWriteVtx(ImVec2(c.x, a.y), uv, col_upr_right);
PrimWriteVtx(c, uv, col_bot_right);
PrimWriteVtx(ImVec2(a.x, c.y), uv, col_bot_left);
}
void ImDrawList::AddTriangleFilled(const ImVec2& a, const ImVec2& b, const ImVec2& c, ImU32 col)
{
if ((col >> 24) == 0)
return;
PathLineTo(a);
PathLineTo(b);
PathLineTo(c);
PathFill(col);
}
void ImDrawList::AddCircle(const ImVec2& centre, float radius, ImU32 col, int num_segments)
{
if ((col >> 24) == 0)
return;
const float a_max = IM_PI*2.0f * ((float)num_segments - 1.0f) / (float)num_segments;
PathArcTo(centre, radius, 0.0f, a_max, num_segments);
PathStroke(col, true);
}
void ImDrawList::AddCircleFilled(const ImVec2& centre, float radius, ImU32 col, int num_segments)
{
if ((col >> 24) == 0)
return;
const float a_max = IM_PI*2.0f * ((float)num_segments - 1.0f) / (float)num_segments;
PathArcTo(centre, radius, 0.0f, a_max, num_segments);
PathFill(col);
}
void ImDrawList::AddText(const ImFont* font, float font_size, const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end, float wrap_width, const ImVec4* cpu_fine_clip_rect)
{
if ((col >> 24) == 0)
return;
if (text_end == NULL)
text_end = text_begin + strlen(text_begin);
if (text_begin == text_end)
return;
IM_ASSERT(font->ContainerAtlas->TexID == _TextureIdStack.back()); // Use high-level ImGui::PushFont() or low-level ImDrawList::PushTextureId() to change font.
// reserve vertices for worse case
const int char_count = (int)(text_end - text_begin);
const int vtx_count_max = char_count * 4;
const int idx_count_max = char_count * 6;
const int vtx_begin = VtxBuffer.Size;
const int idx_begin = IdxBuffer.Size;
PrimReserve(idx_count_max, vtx_count_max);
ImVec4 clip_rect = _ClipRectStack.back();
if (cpu_fine_clip_rect)
{
clip_rect.x = ImMax(clip_rect.x, cpu_fine_clip_rect->x);
clip_rect.y = ImMax(clip_rect.y, cpu_fine_clip_rect->y);
clip_rect.z = ImMin(clip_rect.z, cpu_fine_clip_rect->z);
clip_rect.w = ImMin(clip_rect.w, cpu_fine_clip_rect->w);
}
font->RenderText(font_size, pos, col, clip_rect, text_begin, text_end, this, wrap_width, cpu_fine_clip_rect != NULL);
// give back unused vertices
// FIXME-OPT
VtxBuffer.resize((int)(_VtxWritePtr - VtxBuffer.Data));
IdxBuffer.resize((int)(_IdxWritePtr - IdxBuffer.Data));
int vtx_unused = vtx_count_max - (VtxBuffer.Size - vtx_begin);
int idx_unused = idx_count_max - (IdxBuffer.Size - idx_begin);
CmdBuffer.back().ElemCount -= idx_unused;
_VtxWritePtr -= vtx_unused;
_IdxWritePtr -= idx_unused;
_VtxCurrentIdx = (ImDrawIdx)VtxBuffer.Size;
}
// This is one of the few function breaking the encapsulation of ImDrawLst, but it is just so useful.
void ImDrawList::AddText(const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end)
{
if ((col >> 24) == 0)
return;
AddText(ImGui::GetWindowFont(), ImGui::GetWindowFontSize(), pos, col, text_begin, text_end);
}
void ImDrawList::AddImage(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& uv0, const ImVec2& uv1, ImU32 col)
{
if ((col >> 24) == 0)
return;
// FIXME-OPT: This is wasting draw calls.
const bool push_texture_id = _TextureIdStack.empty() || user_texture_id != _TextureIdStack.back();
if (push_texture_id)
PushTextureID(user_texture_id);
PrimReserve(6, 4);
PrimRectUV(a, b, uv0, uv1, col);
if (push_texture_id)
PopTextureID();
}
//-----------------------------------------------------------------------------
// ImDrawData
//-----------------------------------------------------------------------------
// For backward compatibility: convert all buffers from indexed to de-indexed, in case you cannot render indexed. Note: this is slow and most likely a waste of resources. Always prefer indexed rendering!
void ImDrawData::DeIndexAllBuffers()
{
ImVector<ImDrawVert> new_vtx_buffer;
TotalVtxCount = TotalIdxCount = 0;
for (int i = 0; i < CmdListsCount; i++)
{
ImDrawList* cmd_list = CmdLists[i];
if (cmd_list->IdxBuffer.empty())
continue;
new_vtx_buffer.resize(cmd_list->IdxBuffer.Size);
for (int j = 0; j < cmd_list->IdxBuffer.Size; j++)
new_vtx_buffer[j] = cmd_list->VtxBuffer[cmd_list->IdxBuffer[j]];
cmd_list->VtxBuffer.swap(new_vtx_buffer);
cmd_list->IdxBuffer.resize(0);
TotalVtxCount += cmd_list->VtxBuffer.Size;
}
}
//-----------------------------------------------------------------------------
// ImFontAtlias
//-----------------------------------------------------------------------------
ImFontConfig::ImFontConfig()
{
FontData = NULL;
FontDataSize = 0;
FontDataOwnedByAtlas = true;
FontNo = 0;
SizePixels = 0.0f;
OversampleH = 3;
OversampleV = 1;
PixelSnapH = false;
GlyphExtraSpacing = ImVec2(0.0f, 0.0f);
GlyphRanges = NULL;
MergeMode = false;
MergeGlyphCenterV = false;
DstFont = NULL;
memset(Name, 0, sizeof(Name));
}
ImFontAtlas::ImFontAtlas()
{
TexID = NULL;
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
TexWidth = TexHeight = 0;
TexUvWhitePixel = ImVec2(0, 0);
}
ImFontAtlas::~ImFontAtlas()
{
Clear();
}
void ImFontAtlas::ClearInputData()
{
for (int i = 0; i < ConfigData.Size; i++)
if (ConfigData[i].FontData && ConfigData[i].FontDataOwnedByAtlas)
{
ImGui::MemFree(ConfigData[i].FontData);
ConfigData[i].FontData = NULL;
}
// When clearing this we lose access to the font name and other information used to build the font.
for (int i = 0; i < Fonts.Size; i++)
if (Fonts[i]->ConfigData >= ConfigData.Data && Fonts[i]->ConfigData < ConfigData.Data + ConfigData.Size)
{
Fonts[i]->ConfigData = NULL;
Fonts[i]->ConfigDataCount = 0;
}
ConfigData.clear();
}
void ImFontAtlas::ClearTexData()
{
if (TexPixelsAlpha8)
ImGui::MemFree(TexPixelsAlpha8);
if (TexPixelsRGBA32)
ImGui::MemFree(TexPixelsRGBA32);
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
}
void ImFontAtlas::ClearFonts()
{
for (int i = 0; i < Fonts.Size; i++)
{
Fonts[i]->~ImFont();
ImGui::MemFree(Fonts[i]);
}
Fonts.clear();
}
void ImFontAtlas::Clear()
{
ClearInputData();
ClearTexData();
ClearFonts();
}
void ImFontAtlas::GetTexDataAsAlpha8(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
// Lazily build
if (TexPixelsAlpha8 == NULL)
{
if (ConfigData.empty())
AddFontDefault();
Build();
}
*out_pixels = TexPixelsAlpha8;
if (out_width) *out_width = TexWidth;
if (out_height) *out_height = TexHeight;
if (out_bytes_per_pixel) *out_bytes_per_pixel = 1;
}
void ImFontAtlas::GetTexDataAsRGBA32(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
// Lazily convert to RGBA32 format
// Although it is likely to be the most commonly used format, our font rendering is 8 bpp
if (!TexPixelsRGBA32)
{
unsigned char* pixels;
GetTexDataAsAlpha8(&pixels, NULL, NULL);
TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc((size_t)(TexWidth * TexHeight * 4));
const unsigned char* src = pixels;
unsigned int* dst = TexPixelsRGBA32;
for (int n = TexWidth * TexHeight; n > 0; n--)
*dst++ = ((unsigned int)(*src++) << 24) | 0x00FFFFFF;
}
*out_pixels = (unsigned char*)TexPixelsRGBA32;
if (out_width) *out_width = TexWidth;
if (out_height) *out_height = TexHeight;
if (out_bytes_per_pixel) *out_bytes_per_pixel = 4;
}
ImFont* ImFontAtlas::AddFont(const ImFontConfig* font_cfg)
{
IM_ASSERT(font_cfg->FontData != NULL && font_cfg->FontDataSize > 0);
IM_ASSERT(font_cfg->SizePixels > 0.0f);
// Create new font
if (!font_cfg->MergeMode)
{
ImFont* font = (ImFont*)ImGui::MemAlloc(sizeof(ImFont));
new (font) ImFont();
Fonts.push_back(font);
}
ConfigData.push_back(*font_cfg);
ImFontConfig& new_font_cfg = ConfigData.back();
new_font_cfg.DstFont = Fonts.back();
if (!new_font_cfg.FontDataOwnedByAtlas)
{
new_font_cfg.FontData = ImGui::MemAlloc(new_font_cfg.FontDataSize);
new_font_cfg.FontDataOwnedByAtlas = true;
memcpy(new_font_cfg.FontData, font_cfg->FontData, (size_t)new_font_cfg.FontDataSize);
}
// Invalidate texture
ClearTexData();
return Fonts.back();
}
// Default font ttf is compressed with stb_compress then base85 encoded (see extra_fonts/binary_to_compressed_c.cpp for encoder)
static unsigned int stb_decompress_length(unsigned char *input);
static unsigned int stb_decompress(unsigned char *output, unsigned char *i, unsigned int length);
static const char* GetDefaultCompressedFontDataTTFBase85();
static unsigned int Decode85Byte(char c) { return c >= '\\' ? c-36 : c-35; }
static void Decode85(const unsigned char* src, unsigned int* dst) { for (; *src; src += 5) *dst++ = Decode85Byte(src[0]) + 85*(Decode85Byte(src[1]) + 85*(Decode85Byte(src[2]) + 85*(Decode85Byte(src[3]) + 85*Decode85Byte(src[4])))); }
// Load embedded ProggyClean.ttf at size 13
ImFont* ImFontAtlas::AddFontDefault(const ImFontConfig* font_cfg_template)
{
ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
if (!font_cfg_template)
{
font_cfg.OversampleH = font_cfg.OversampleV = 1;
font_cfg.PixelSnapH = true;
}
if (font_cfg.Name[0] == '\0') strcpy(font_cfg.Name, "<default>");
const char* ttf_compressed_base85 = GetDefaultCompressedFontDataTTFBase85();
ImFont* font = AddFontFromMemoryCompressedBase85TTF(ttf_compressed_base85, 13.0f, &font_cfg, GetGlyphRangesDefault());
return font;
}
ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels, const ImFontConfig* font_cfg_template, const ImWchar* glyph_ranges)
{
void* data = NULL;
int data_size = 0;
if (!ImLoadFileToMemory(filename, "rb", (void**)&data, &data_size, 0))