Fix T44882, color picker in texpainting doing linear interpolation even

when mipmap is off.

We used to always have nearest interpolation for texpaint but at least
make this work with mipmap off correctly.

Also added conversion casts to avoid integer overflow in filtering code

1 files changed, 47 insertions, 12 deletions

diff --git a/source/blender/imbuf/intern/imageprocess.c b/source/blender/imbuf/intern/imageprocess.c
index 90219461772..d44f0dc86f4 100644
--- a/source/blender/imbuf/intern/imageprocess.c
+++ b/source/blender/imbuf/intern/imageprocess.c
@@ -51,7 +51,7 @@
 /* Only this one is used liberally here, and in imbuf */
 void IMB_convert_rgba_to_abgr(struct ImBuf *ibuf)
 {
-	int size;
+	size_t size;
 	unsigned char rt, *cp = (unsigned char *)ibuf->rect;
 	float rtf, *cpf = ibuf->rect_float;
 
@@ -86,7 +86,7 @@ void IMB_convert_rgba_to_abgr(struct ImBuf *ibuf)
 static void pixel_from_buffer(struct ImBuf *ibuf, unsigned char **outI, float **outF, int x, int y)
 
 {
-	int offset = ibuf->x * y * 4 + 4 * x;
+	size_t offset = ((size_t)ibuf->x) * y * 4 + 4 * x;
 	
 	if (ibuf->rect)
 		*outI = (unsigned char *)ibuf->rect + offset;
@@ -172,10 +172,10 @@ void bilinear_interpolation_color_wrap(struct ImBuf *in, unsigned char outI[4],
 
 	if (outF) {
 		/* sample including outside of edges of image */
-		row1 = in->rect_float + in->x * y1 * 4 + 4 * x1;
-		row2 = in->rect_float + in->x * y2 * 4 + 4 * x1;
-		row3 = in->rect_float + in->x * y1 * 4 + 4 * x2;
-		row4 = in->rect_float + in->x * y2 * 4 + 4 * x2;
+		row1 = in->rect_float + ((size_t)in->x) * y1 * 4 + 4 * x1;
+		row2 = in->rect_float + ((size_t)in->x) * y2 * 4 + 4 * x1;
+		row3 = in->rect_float + ((size_t)in->x) * y1 * 4 + 4 * x2;
+		row4 = in->rect_float + ((size_t)in->x) * y2 * 4 + 4 * x2;
 
 		outF[0] = ma_mb * row1[0] + a_mb * row3[0] + ma_b * row2[0] + a_b * row4[0];
 		outF[1] = ma_mb * row1[1] + a_mb * row3[1] + ma_b * row2[1] + a_b * row4[1];
@@ -190,10 +190,10 @@ void bilinear_interpolation_color_wrap(struct ImBuf *in, unsigned char outI[4],
 	}
 	if (outI) {
 		/* sample including outside of edges of image */
-		row1I = (unsigned char *)in->rect + in->x * y1 * 4 + 4 * x1;
-		row2I = (unsigned char *)in->rect + in->x * y2 * 4 + 4 * x1;
-		row3I = (unsigned char *)in->rect + in->x * y1 * 4 + 4 * x2;
-		row4I = (unsigned char *)in->rect + in->x * y2 * 4 + 4 * x2;
+		row1I = (unsigned char *)in->rect + ((size_t)in->x) * y1 * 4 + 4 * x1;
+		row2I = (unsigned char *)in->rect + ((size_t)in->x) * y2 * 4 + 4 * x1;
+		row3I = (unsigned char *)in->rect + ((size_t)in->x) * y1 * 4 + 4 * x2;
+		row4I = (unsigned char *)in->rect + ((size_t)in->x) * y2 * 4 + 4 * x2;
 		
 		/* need to add 0.5 to avoid rounding down (causes darken with the smear brush)
 		 * tested with white images and this should not wrap back to zero */
@@ -256,14 +256,14 @@ void nearest_interpolation_color(struct ImBuf *in, unsigned char outI[4], float
 		}
 	}
 	else {
-		dataI = (unsigned char *)in->rect + in->x * y1 * 4 + 4 * x1;
+		dataI = (unsigned char *)in->rect + ((size_t)in->x) * y1 * 4 + 4 * x1;
 		if (outI) {
 			outI[0] = dataI[0];
 			outI[1] = dataI[1];
 			outI[2] = dataI[2];
 			outI[3] = dataI[3];
 		}
-		dataF = in->rect_float + in->x * y1 * 4 + 4 * x1;
+		dataF = in->rect_float + ((size_t)in->x) * y1 * 4 + 4 * x1;
 		if (outF) {
 			outF[0] = dataF[0];
 			outF[1] = dataF[1];
@@ -273,6 +273,41 @@ void nearest_interpolation_color(struct ImBuf *in, unsigned char outI[4], float
 	}
 }
 
+
+void nearest_interpolation_color_wrap(struct ImBuf *in, unsigned char outI[4], float outF[4], float u, float v)
+{
+	const float *dataF;
+	unsigned char *dataI;
+	int y, x;
+
+	/* ImBuf in must have a valid rect or rect_float, assume this is already checked */
+
+	x = (int) floor(u);
+	y = (int) floor(v);
+
+	x = x % in->x;
+	y = y % in->y;
+
+	/* wrap interpolation pixels - main difference from nearest_interpolation_color  */
+	if (x < 0) x += in->x;
+	if (y < 0) y += in->y;
+
+	dataI = (unsigned char *)in->rect + ((size_t)in->x) * y * 4 + 4 * x;
+	if (outI) {
+		outI[0] = dataI[0];
+		outI[1] = dataI[1];
+		outI[2] = dataI[2];
+		outI[3] = dataI[3];
+	}
+	dataF = in->rect_float + ((size_t)in->x) * y * 4 + 4 * x;
+	if (outF) {
+		outF[0] = dataF[0];
+		outF[1] = dataF[1];
+		outF[2] = dataF[2];
+		outF[3] = dataF[3];
+	}
+}
+
 void nearest_interpolation(ImBuf *in, ImBuf *out, float x, float y, int xout, int yout)
 {
 	unsigned char *outI = NULL;