From 659b3fd259c62820ec5c133da48214052d23213b Mon Sep 17 00:00:00 2001
From: Peter <craven@gmx.net>
Date: Mon, 6 Feb 2017 10:30:16 +0100
Subject: [PATCH 1/2] Add ImDrawList::AddImageQuad

Adds a function
  AddImageQuad(user_texture_id, a, b, c, d, uva, uvb, uvc, uvd, col)
that shows a texture on a full quad. This allows showing arbitrary
rotations of a texture.
---
 imgui.h        |  1 +
 imgui_draw.cpp | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/imgui.h b/imgui.h
index bf6871786..47b196c0e 100644
--- a/imgui.h
+++ b/imgui.h
@@ -1203,6 +1203,7 @@ struct ImDrawList
     IMGUI_API void  AddText(const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL);
     IMGUI_API void  AddText(const ImFont* font, float font_size, const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL, float wrap_width = 0.0f, const ImVec4* cpu_fine_clip_rect = NULL);
     IMGUI_API void  AddImage(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& uv0 = ImVec2(0,0), const ImVec2& uv1 = ImVec2(1,1), ImU32 col = 0xFFFFFFFF);
+    IMGUI_API void  AddImageQuad(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uva = ImVec2(0,0), const ImVec2& uvb = ImVec2(1,0), const ImVec2& uvc = ImVec2(1,1), const ImVec2& uvd = ImVec2(0,1), ImU32 col = 0xFFFFFFFF);
     IMGUI_API void  AddPolyline(const ImVec2* points, const int num_points, ImU32 col, bool closed, float thickness, bool anti_aliased);
     IMGUI_API void  AddConvexPolyFilled(const ImVec2* points, const int num_points, ImU32 col, bool anti_aliased);
     IMGUI_API void  AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments = 0);
diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index b0931b60c..a5f0814c9 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -975,6 +975,23 @@ void ImDrawList::AddImage(ImTextureID user_texture_id, const ImVec2& a, const Im
         PopTextureID();
 }
 
+void ImDrawList::AddImageQuad(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uva, const ImVec2& uvb, const ImVec2& uvc, const ImVec2& uvd, 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);
+    PrimQuadUV(a, b, c, d, uva, uvb, uvc, uvd, col);
+
+    if (push_texture_id)
+        PopTextureID();
+}
+
 //-----------------------------------------------------------------------------
 // ImDrawData
 //-----------------------------------------------------------------------------

From 6517d68cdf93bc12e5b6a77c8af58af8846e33fb Mon Sep 17 00:00:00 2001
From: omar <omarcornut@gmail.com>
Date: Mon, 1 May 2017 12:34:32 +0200
Subject: [PATCH 2/2] ImDrawList::AddImage* renamed uv_ parameters to be more
 consistent. Fix AddImageQuad to use IM_COL32_A_MASK (#1009)

---
 imgui.h        |  8 ++++----
 imgui_draw.cpp | 11 +++++------
 2 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/imgui.h b/imgui.h
index 47b196c0e..7f48bd283 100644
--- a/imgui.h
+++ b/imgui.h
@@ -1050,9 +1050,9 @@ struct ImGuiSizeConstraintCallbackData
 #define IM_COL32_A_MASK     0xFF000000
 #endif
 #define IM_COL32(R,G,B,A)    (((ImU32)(A)<<IM_COL32_A_SHIFT) | ((ImU32)(B)<<IM_COL32_B_SHIFT) | ((ImU32)(G)<<IM_COL32_G_SHIFT) | ((ImU32)(R)<<IM_COL32_R_SHIFT))
-#define IM_COL32_WHITE       IM_COL32(255,255,255,255)  // Opaque white
+#define IM_COL32_WHITE       IM_COL32(255,255,255,255)  // Opaque white = 0xFFFFFFFF
 #define IM_COL32_BLACK       IM_COL32(0,0,0,255)        // Opaque black
-#define IM_COL32_BLACK_TRANS IM_COL32(0,0,0,0)          // Transparent black
+#define IM_COL32_BLACK_TRANS IM_COL32(0,0,0,0)          // Transparent black = 0x00000000
 
 // ImColor() helper to implicity converts colors to either ImU32 (packed 4x1 byte) or ImVec4 (4x1 float)
 // Prefer using IM_COL32() macros if you want a guaranteed compile-time ImU32 for usage with ImDrawList API.
@@ -1202,8 +1202,8 @@ struct ImDrawList
     IMGUI_API void  AddCircleFilled(const ImVec2& centre, float radius, ImU32 col, int num_segments = 12);
     IMGUI_API void  AddText(const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL);
     IMGUI_API void  AddText(const ImFont* font, float font_size, const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL, float wrap_width = 0.0f, const ImVec4* cpu_fine_clip_rect = NULL);
-    IMGUI_API void  AddImage(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& uv0 = ImVec2(0,0), const ImVec2& uv1 = ImVec2(1,1), ImU32 col = 0xFFFFFFFF);
-    IMGUI_API void  AddImageQuad(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uva = ImVec2(0,0), const ImVec2& uvb = ImVec2(1,0), const ImVec2& uvc = ImVec2(1,1), const ImVec2& uvd = ImVec2(0,1), ImU32 col = 0xFFFFFFFF);
+    IMGUI_API void  AddImage(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& uv_a = ImVec2(0,0), const ImVec2& uv_b = ImVec2(1,1), ImU32 col = 0xFFFFFFFF);
+    IMGUI_API void  AddImageQuad(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uv_a = ImVec2(0,0), const ImVec2& uv_b = ImVec2(1,0), const ImVec2& uv_c = ImVec2(1,1), const ImVec2& uv_d = ImVec2(0,1), ImU32 col = 0xFFFFFFFF);
     IMGUI_API void  AddPolyline(const ImVec2* points, const int num_points, ImU32 col, bool closed, float thickness, bool anti_aliased);
     IMGUI_API void  AddConvexPolyFilled(const ImVec2* points, const int num_points, ImU32 col, bool anti_aliased);
     IMGUI_API void  AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments = 0);
diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index a5f0814c9..80bd83860 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -958,7 +958,7 @@ void ImDrawList::AddText(const ImVec2& pos, ImU32 col, const char* text_begin, c
     AddText(GImGui->Font, GImGui->FontSize, 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)
+void ImDrawList::AddImage(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& uv_a, const ImVec2& uv_b, ImU32 col)
 {
     if ((col & IM_COL32_A_MASK) == 0)
         return;
@@ -969,24 +969,23 @@ void ImDrawList::AddImage(ImTextureID user_texture_id, const ImVec2& a, const Im
         PushTextureID(user_texture_id);
 
     PrimReserve(6, 4);
-    PrimRectUV(a, b, uv0, uv1, col);
+    PrimRectUV(a, b, uv_a, uv_b, col);
 
     if (push_texture_id)
         PopTextureID();
 }
 
-void ImDrawList::AddImageQuad(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uva, const ImVec2& uvb, const ImVec2& uvc, const ImVec2& uvd, ImU32 col)
+void ImDrawList::AddImageQuad(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uv_a, const ImVec2& uv_b, const ImVec2& uv_c, const ImVec2& uv_d, ImU32 col)
 {
-    if ((col >> 24) == 0)
+    if ((col & IM_COL32_A_MASK) == 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);
-    PrimQuadUV(a, b, c, d, uva, uvb, uvc, uvd, col);
+    PrimQuadUV(a, b, c, d, uv_a, uv_b, uv_c, uv_d, col);
 
     if (push_texture_id)
         PopTextureID();