From fc8040d695644aaca4596adebeca4ea1369ef630 Mon Sep 17 00:00:00 2001
From: Fox Caminiti <fox@foxcam.net>
Date: Fri, 22 Jul 2022 20:45:08 -0400
Subject: first

---
 paint.cpp | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 paint.cpp

(limited to 'paint.cpp')

diff --git a/paint.cpp b/paint.cpp
new file mode 100644
index 0000000..f760d8e
--- /dev/null
+++ b/paint.cpp
@@ -0,0 +1,103 @@
+
+internal void
+SlidingBrush(pixel_buffer *Buffer, v2i Pos, brush_tool Brush)
+{
+    v2i Min = {0,0};
+    v2i Max = Min + (int16)Brush.Size;
+
+    v2 Center = {(real32)Max.x / 2.0f, (real32)Max.y / 2.0f};
+    real32 MaxLength = sqrt(LengthSq(Center));
+
+    v2i LayerMin = Pos - (Brush.Size / 2);
+    v2i LayerMax = Pos + (Brush.Size / 2);
+
+    rectangle LayerBounds = {0, 0, Buffer->Width, Buffer->Height};
+    rectangle Paint = ClipRectangle({LayerMin, LayerMax}, LayerBounds);
+
+    uint8 *Row = ((uint8 *)Buffer->OriginalBuffer + Buffer->Pitch*Paint.Min.y);
+    for(int Y = Paint.Min.y;
+        Y < Paint.Max.y;
+        ++Y)
+    {
+        uint32 *Pixel = (uint32 *)(Row + Paint.Min.x*sizeof(uint32));
+        for(int X = Paint.Min.x;
+            X < Paint.Max.x;
+            ++X)
+        {
+            v2 Pos = V2(abs(Center.x - (X - Paint.Min.x)), abs(Center.y - (Y - Paint.Min.y)));
+            real32 L = sqrt(LengthSq(Pos)) + Center.x;
+            real32 Gradient = pow(Ceil(L, MaxLength) / MaxLength, Brush.Hardness);
+            RenderAlpha(Pixel, ColToUint32({1.0f, 0.0f, 0.0f, 1.0f - Gradient}));
+            Pixel++;
+        }
+        Row += Buffer->Pitch;
+    }
+}
+
+/*
+internal void
+Paint(sdl_input Input, project_layer *Layer, brush_tool Brush)
+{
+    int16 X = Input.Mouse.x - UI.CompX; // convert to comp space
+    int16 Y = Input.Mouse.y - UI.CompY;
+
+    real32 Rad = (Layer->rotation.CurrentValue.f * (PI / 180));
+    real32 s = Layer->scale.CurrentValue.f;
+    v2 Scale = {Layer->Raster.Width * s, Layer->Raster.Height * s};
+
+    v2 XAxis = (Layer->Raster.Width * s)*V2(cos(Rad), sin(Rad));
+    v2 YAxis = (Layer->Raster.Height * -s)*V2(sin(Rad), -cos(Rad));
+
+    real32 AnchorX = Layer->ax.CurrentValue.f;
+    real32 AnchorY = Layer->ay.CurrentValue.f;
+
+    v2 Pos = {Layer->x.CurrentValue.f, Layer->y.CurrentValue.f};
+    v2 Origin = Pos - (XAxis * AnchorX) - (YAxis * AnchorY);
+
+    real32 XLengthSq = 1.0f / LengthSq(XAxis);
+    real32 YLengthSq = 1.0f / LengthSq(YAxis);
+
+    v2 CurrentPixel = V2(X, Y);
+    v2 StartVector = CurrentPixel - Origin;
+
+    real32 U = XLengthSq*Inner(StartVector, XAxis);
+    real32 V = YLengthSq*Inner(StartVector, YAxis);
+
+    v2i TexelCoord = {};
+    TexelCoord.x = 1.0f + ((U*(real32)(Layer->Raster.Width - 1)) + 0.5f);
+    TexelCoord.y = 1.0f + ((V*(real32)(Layer->Raster.Height - 1)) + 0.5f);
+
+    v2i Min = {0,0};
+    v2i Max = Min + (int16)Brush.Size;
+
+    v2 Center = {(real32)Max.x / 2.0f, (real32)Max.y / 2.0f};
+    real32 MaxLength = sqrt(LengthSq(Center));
+
+    v2i LayerMin = TexelCoord - (Brush.Size / 2);
+    v2i LayerMax = TexelCoord + (Brush.Size / 2);
+
+    rectangle LayerBounds = {0, 0, Layer->Raster.Width, Layer->Raster.Height};
+    rectangle Paint = {LayerMin, LayerMax};
+
+    uint8 *Row = ((uint8 *)Layer->Raster.OriginalBuffer + Layer->Raster.Pitch*Paint.Min.y);
+    for(int Y = Paint.Min.y;
+        Y < Paint.Max.y;
+        ++Y)
+    {
+        uint32 *Pixel = (uint32 *)(Row + Paint.Min.x*sizeof(uint32));
+        for(int X = Paint.Min.x;
+            X < Paint.Max.x;
+            ++X)
+        {
+            if (X < Layer->Raster.Width && X > 0) {
+                v2 Pos = V2(abs(Center.x - (X - Paint.Min.x)), abs(Center.y - (Y - Paint.Min.y)));
+                real32 L = sqrt(LengthSq(Pos)) + Center.x;
+                real32 Gradient = pow(Ceil(L, MaxLength) / MaxLength, Brush.Hardness);
+                RenderAlpha(Pixel, ColToUint32({1.0f, 1.0f, 1.0f, 1.0f - Gradient}));
+            }
+            Pixel++;
+        }
+        Row += Layer->Raster.Pitch;
+    }
+}
+*/
-- 
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