Merge pull request #616 from overdev/master

[Feature Request] 9-patch drawing function

2 files changed, 213 insertions, 0 deletions

diff --git a/src/raylib.h b/src/raylib.h
index 8d1389f7..af31e779 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -412,6 +412,15 @@ typedef struct RenderTexture2D {
 // RenderTexture type, same as RenderTexture2D
 typedef RenderTexture2D RenderTexture;
 
+typedef struct NPatchInfo {
+    Rectangle sourceRec;   // Region in the texture
+    int left;              // left border offset
+    int top;               // top border offset
+    int right;             // right border offset
+    int bottom;            // bottom border offset
+    int type;              // layout of the n-patch: 3x3, 1x3 or 3x1
+} NPatchInfo;
+
 // Font character info
 typedef struct CharInfo {
     int value;              // Character value (Unicode)
@@ -729,6 +738,13 @@ typedef enum {
     HMD_SONY_PSVR
 } VrDeviceType;
 
+// Type of n-patch
+typedef enum {
+    NPT_9PATCH = 0,         // 3x3
+    NPT_3PATCH_VERTICAL,    // 1x3
+    NPT_3PATCH_HORIZONTAL   // 3x1
+} NPatchType;
+
 // Callbacks to be implemented by users
 typedef void (*TraceLogCallback)(int msgType, const char *text, va_list args);
 
@@ -999,6 +1015,7 @@ RLAPI void DrawTextureV(Texture2D texture, Vector2 position, Color tint);
 RLAPI void DrawTextureEx(Texture2D texture, Vector2 position, float rotation, float scale, Color tint);  // Draw a Texture2D with extended parameters
 RLAPI void DrawTextureRec(Texture2D texture, Rectangle sourceRec, Vector2 position, Color tint);         // Draw a part of a texture defined by a rectangle
 RLAPI void DrawTexturePro(Texture2D texture, Rectangle sourceRec, Rectangle destRec, Vector2 origin, float rotation, Color tint); // Draw a part of a texture defined by a rectangle with 'pro' parameters
+RLAPI void DrawTextureNPatch(Texture2D texture, NPatchInfo nPatchInfo, Rectangle destRec, Vector2 origin, float rotation, Color tint); // Draws a texture (or part of it) that stretches or shrinks nicely.
 
 //------------------------------------------------------------------------------------
 // Font Loading and Text Drawing Functions (Module: text)
diff --git a/src/textures.c b/src/textures.c
index 1d052070..700b4be9 100644
--- a/src/textures.c
+++ b/src/textures.c
@@ -2331,6 +2331,202 @@ void DrawTexturePro(Texture2D texture, Rectangle sourceRec, Rectangle destRec, V
     }
 }
 
+void DrawTextureNPatch(Texture2D texture, NPatchInfo nPatchInfo, Rectangle destRec, Vector2 origin, float rotation, Color tint)
+{
+    if (texture.id > 0)
+    {
+        float width = (float)texture.width;
+        float height = (float)texture.height;
+
+        float patchWidth = (destRec.width <= 0.0f)? 0.0f : destRec.width;
+        float patchHeight = (destRec.height <= 0.0f)? 0.0f : destRec.height;
+
+        if (nPatchInfo.sourceRec.width < 0) nPatchInfo.sourceRec.x -= nPatchInfo.sourceRec.width;
+        if (nPatchInfo.sourceRec.height < 0) nPatchInfo.sourceRec.y -= nPatchInfo.sourceRec.height;
+        if (nPatchInfo.type == NPT_3PATCH_HORIZONTAL) patchHeight = nPatchInfo.sourceRec.height;
+        if (nPatchInfo.type == NPT_3PATCH_VERTICAL) patchWidth = nPatchInfo.sourceRec.width;
+
+        bool drawCenter = true;
+        bool drawMiddle = true;
+        float leftBorder = (float)nPatchInfo.left;
+        float topBorder = (float)nPatchInfo.top;
+        float rightBorder = (float)nPatchInfo.right;
+        float bottomBorder = (float)nPatchInfo.bottom;
+
+        // adjust the lateral (left and right) border widths in case patchWidth < texture.width
+        if (patchWidth <= (leftBorder + rightBorder) && nPatchInfo.type != NPT_3PATCH_VERTICAL)
+        {
+            drawCenter = false;
+            leftBorder = (leftBorder / (leftBorder + rightBorder)) * patchWidth;
+            rightBorder = patchWidth - leftBorder;
+        }
+        // adjust the lateral (top and bottom) border heights in case patchHeight < texture.height
+        if (patchHeight <= (topBorder + bottomBorder) && nPatchInfo.type != NPT_3PATCH_HORIZONTAL)
+        {
+            drawMiddle = false;
+            topBorder = (topBorder / (topBorder + bottomBorder)) * patchHeight;
+            bottomBorder = patchHeight - topBorder;
+        }
+
+        Vector2 vertA, vertB, vertC, vertD;
+        vertA.x = 0.0f;                             // outer left
+        vertA.y = 0.0f;                             // outer top
+        vertB.x = leftBorder;                       // inner left
+        vertB.y = topBorder;                        // inner top
+        vertC.x = patchWidth  - rightBorder;        // inner right
+        vertC.y = patchHeight - bottomBorder;       // inner bottom
+        vertD.x = patchWidth;                       // outer right
+        vertD.y = patchHeight;                      // outer bottom
+
+        Vector2 coordA, coordB, coordC, coordD;
+        coordA.x = nPatchInfo.sourceRec.x / width;
+        coordA.y = nPatchInfo.sourceRec.y / height;
+        coordB.x = (nPatchInfo.sourceRec.x + leftBorder) / width;
+        coordB.y = (nPatchInfo.sourceRec.y + topBorder) / height;
+        coordC.x = (nPatchInfo.sourceRec.x + nPatchInfo.sourceRec.width  - rightBorder) / width;
+        coordC.y = (nPatchInfo.sourceRec.y + nPatchInfo.sourceRec.height - bottomBorder) / height;
+        coordD.x = (nPatchInfo.sourceRec.x + nPatchInfo.sourceRec.width)  / width;
+        coordD.y = (nPatchInfo.sourceRec.y + nPatchInfo.sourceRec.height) / height;
+
+        rlEnableTexture(texture.id);
+
+        rlPushMatrix();
+            rlTranslatef(destRec.x, destRec.y, 0);
+            rlRotatef(rotation, 0, 0, 1);
+            rlTranslatef(-origin.x, -origin.y, 0);
+
+            rlBegin(RL_QUADS);
+                rlColor4ub(tint.r, tint.g, tint.b, tint.a);
+                rlNormal3f(0.0f, 0.0f, 1.0f);                          // Normal vector pointing towards viewer
+
+                if (nPatchInfo.type == NPT_9PATCH)
+                {
+                    // ------------------------------------------------------------
+                    // TOP-LEFT QUAD
+                    rlTexCoord2f(coordA.x, coordB.y); rlVertex2f(vertA.x, vertB.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordB.x, coordB.y); rlVertex2f(vertB.x, vertB.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordB.x, coordA.y); rlVertex2f(vertB.x, vertA.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordA.x, coordA.y); rlVertex2f(vertA.x, vertA.y);  // Top-left corner for texture and quad
+                    if (drawCenter)
+                    {
+                        // TOP-CENTER QUAD
+                        rlTexCoord2f(coordB.x, coordB.y); rlVertex2f(vertB.x, vertB.y);  // Bottom-left corner for texture and quad
+                        rlTexCoord2f(coordC.x, coordB.y); rlVertex2f(vertC.x, vertB.y);  // Bottom-right corner for texture and quad
+                        rlTexCoord2f(coordC.x, coordA.y); rlVertex2f(vertC.x, vertA.y);  // Top-right corner for texture and quad
+                        rlTexCoord2f(coordB.x, coordA.y); rlVertex2f(vertB.x, vertA.y);  // Top-left corner for texture and quad
+                    }
+                    // TOP-RIGHT QUAD
+                    rlTexCoord2f(coordC.x, coordB.y); rlVertex2f(vertC.x, vertB.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordB.y); rlVertex2f(vertD.x, vertB.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordA.y); rlVertex2f(vertD.x, vertA.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordC.x, coordA.y); rlVertex2f(vertC.x, vertA.y);  // Top-left corner for texture and quad
+                    if (drawMiddle)
+                    {
+                        // ------------------------------------------------------------
+                        // MIDDLE-LEFT QUAD
+                        rlTexCoord2f(coordA.x, coordC.y); rlVertex2f(vertA.x, vertC.y);  // Bottom-left corner for texture and quad
+                        rlTexCoord2f(coordB.x, coordC.y); rlVertex2f(vertB.x, vertC.y);  // Bottom-right corner for texture and quad
+                        rlTexCoord2f(coordB.x, coordB.y); rlVertex2f(vertB.x, vertB.y);  // Top-right corner for texture and quad
+                        rlTexCoord2f(coordA.x, coordB.y); rlVertex2f(vertA.x, vertB.y);  // Top-left corner for texture and quad
+                        if (drawCenter)
+                        {
+                            // MIDDLE-CENTER QUAD
+                            rlTexCoord2f(coordB.x, coordC.y); rlVertex2f(vertB.x, vertC.y);  // Bottom-left corner for texture and quad
+                            rlTexCoord2f(coordC.x, coordC.y); rlVertex2f(vertC.x, vertC.y);  // Bottom-right corner for texture and quad
+                            rlTexCoord2f(coordC.x, coordB.y); rlVertex2f(vertC.x, vertB.y);  // Top-right corner for texture and quad
+                            rlTexCoord2f(coordB.x, coordB.y); rlVertex2f(vertB.x, vertB.y);  // Top-left corner for texture and quad
+                        }
+
+                        // MIDDLE-RIGHT QUAD
+                        rlTexCoord2f(coordC.x, coordC.y); rlVertex2f(vertC.x, vertC.y);  // Bottom-left corner for texture and quad
+                        rlTexCoord2f(coordD.x, coordC.y); rlVertex2f(vertD.x, vertC.y);  // Bottom-right corner for texture and quad
+                        rlTexCoord2f(coordD.x, coordB.y); rlVertex2f(vertD.x, vertB.y);  // Top-right corner for texture and quad
+                        rlTexCoord2f(coordC.x, coordB.y); rlVertex2f(vertC.x, vertB.y);  // Top-left corner for texture and quad
+                    }
+
+                    // ------------------------------------------------------------
+                    // BOTTOM-LEFT QUAD
+                    rlTexCoord2f(coordA.x, coordD.y); rlVertex2f(vertA.x, vertD.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordB.x, coordD.y); rlVertex2f(vertB.x, vertD.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordB.x, coordC.y); rlVertex2f(vertB.x, vertC.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordA.x, coordC.y); rlVertex2f(vertA.x, vertC.y);  // Top-left corner for texture and quad
+                    if (drawCenter)
+                    {
+                        // BOTTOM-CENTER QUAD
+                        rlTexCoord2f(coordB.x, coordD.y); rlVertex2f(vertB.x, vertD.y);  // Bottom-left corner for texture and quad
+                        rlTexCoord2f(coordC.x, coordD.y); rlVertex2f(vertC.x, vertD.y);  // Bottom-right corner for texture and quad
+                        rlTexCoord2f(coordC.x, coordC.y); rlVertex2f(vertC.x, vertC.y);  // Top-right corner for texture and quad
+                        rlTexCoord2f(coordB.x, coordC.y); rlVertex2f(vertB.x, vertC.y);  // Top-left corner for texture and quad
+                    }
+
+                    // BOTTOM-RIGHT QUAD
+                    rlTexCoord2f(coordC.x, coordD.y); rlVertex2f(vertC.x, vertD.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordD.y); rlVertex2f(vertD.x, vertD.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordC.y); rlVertex2f(vertD.x, vertC.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordC.x, coordC.y); rlVertex2f(vertC.x, vertC.y);  // Top-left corner for texture and quad
+                }
+                else if (nPatchInfo.type == NPT_3PATCH_VERTICAL)
+                {
+                    // TOP QUAD
+                    // -----------------------------------------------------------
+                    // Texture coords                 Vertices
+                    rlTexCoord2f(coordA.x, coordB.y); rlVertex2f(vertA.x, vertB.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordB.y); rlVertex2f(vertD.x, vertB.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordA.y); rlVertex2f(vertD.x, vertA.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordA.x, coordA.y); rlVertex2f(vertA.x, vertA.y);  // Top-left corner for texture and quad
+                    if (drawCenter)
+                    {
+                        // MIDDLE QUAD
+                        // -----------------------------------------------------------
+                        // Texture coords                 Vertices
+                        rlTexCoord2f(coordA.x, coordC.y); rlVertex2f(vertA.x, vertC.y);  // Bottom-left corner for texture and quad
+                        rlTexCoord2f(coordD.x, coordC.y); rlVertex2f(vertD.x, vertC.y);  // Bottom-right corner for texture and quad
+                        rlTexCoord2f(coordD.x, coordB.y); rlVertex2f(vertD.x, vertB.y);  // Top-right corner for texture and quad
+                        rlTexCoord2f(coordA.x, coordB.y); rlVertex2f(vertA.x, vertB.y);  // Top-left corner for texture and quad
+                    }
+                    // BOTTOM QUAD
+                    // -----------------------------------------------------------
+                    // Texture coords                 Vertices
+                    rlTexCoord2f(coordA.x, coordD.y); rlVertex2f(vertA.x, vertD.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordD.y); rlVertex2f(vertD.x, vertD.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordC.y); rlVertex2f(vertD.x, vertC.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordA.x, coordC.y); rlVertex2f(vertA.x, vertC.y);  // Top-left corner for texture and quad
+                }
+                else if (nPatchInfo.type == NPT_3PATCH_HORIZONTAL)
+                {
+                    // LEFT QUAD
+                    // -----------------------------------------------------------
+                    // Texture coords                 Vertices
+                    rlTexCoord2f(coordA.x, coordD.y); rlVertex2f(vertA.x, vertD.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordB.x, coordD.y); rlVertex2f(vertB.x, vertD.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordB.x, coordA.y); rlVertex2f(vertB.x, vertA.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordA.x, coordA.y); rlVertex2f(vertA.x, vertA.y);  // Top-left corner for texture and quad
+                    if (drawCenter)
+                    {
+                        // CENTER QUAD
+                        // -----------------------------------------------------------
+                        // Texture coords                 Vertices
+                        rlTexCoord2f(coordB.x, coordD.y); rlVertex2f(vertB.x, vertD.y);  // Bottom-left corner for texture and quad
+                        rlTexCoord2f(coordC.x, coordD.y); rlVertex2f(vertC.x, vertD.y);  // Bottom-right corner for texture and quad
+                        rlTexCoord2f(coordC.x, coordA.y); rlVertex2f(vertC.x, vertA.y);  // Top-right corner for texture and quad
+                        rlTexCoord2f(coordB.x, coordA.y); rlVertex2f(vertB.x, vertA.y);  // Top-left corner for texture and quad
+                    }
+                    // RIGHT QUAD
+                    // -----------------------------------------------------------
+                    // Texture coords                 Vertices
+                    rlTexCoord2f(coordC.x, coordD.y); rlVertex2f(vertC.x, vertD.y);  // Bottom-left corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordD.y); rlVertex2f(vertD.x, vertD.y);  // Bottom-right corner for texture and quad
+                    rlTexCoord2f(coordD.x, coordA.y); rlVertex2f(vertD.x, vertA.y);  // Top-right corner for texture and quad
+                    rlTexCoord2f(coordC.x, coordA.y); rlVertex2f(vertC.x, vertA.y);  // Top-left corner for texture and quad
+                }
+            rlEnd();
+        rlPopMatrix();
+
+        rlDisableTexture();
+
+    }
+}
+
 //----------------------------------------------------------------------------------
 // Module specific Functions Definition
 //----------------------------------------------------------------------------------