feather option for dilate/erode node - needed for alpha masks so we can (blur in/out), currently only positive values supported.

source/blender/compositor/operations/COM_GaussianAlphaYBlurOperation.cpp

@@ -0,0 +1,183 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor: 
+ *		Jeroen Bakker 
+ *		Monique Dewanchand
+ *		Campbell Barton
+ */
+
+#include "COM_GaussianAlphaYBlurOperation.h"
+#include "BLI_math.h"
+
+extern "C" {
+	#include "RE_pipeline.h"
+}
+
+GaussianAlphaYBlurOperation::GaussianAlphaYBlurOperation() : BlurBaseOperation(COM_DT_VALUE)
+{
+	this->gausstab = NULL;
+	this->rad = 0;
+}
+
+void *GaussianAlphaYBlurOperation::initializeTileData(rcti *rect, MemoryBuffer **memoryBuffers)
+{
+	if (!this->sizeavailable) {
+		updateGauss(memoryBuffers);
+	}
+	void *buffer = getInputOperation(0)->initializeTileData(NULL, memoryBuffers);
+	return buffer;
+}
+
+void GaussianAlphaYBlurOperation::initExecution()
+{
+	if (this->sizeavailable) {
+		float rad = size * this->data->sizey;
+		if (rad < 1)
+			rad = 1;
+
+		this->rad = rad;
+		this->gausstab = BlurBaseOperation::make_gausstab(rad);
+		this->distbuf_inv = BlurBaseOperation::make_dist_fac_inverse(rad);
+	}
+}
+
+void GaussianAlphaYBlurOperation::updateGauss(MemoryBuffer **memoryBuffers)
+{
+	if (this->gausstab == NULL) {
+		updateSize(memoryBuffers);
+		float rad = size * this->data->sizey;
+		if (rad < 1)
+			rad = 1;
+		
+		this->rad = rad;
+		this->gausstab = BlurBaseOperation::make_gausstab(rad);
+	}
+
+	if (this->distbuf_inv == NULL) {
+		updateSize(memoryBuffers);
+		float rad = size * this->data->sizex;
+		if (rad < 1)
+			rad = 1;
+
+		this->rad = rad;
+		this->distbuf_inv = BlurBaseOperation::make_dist_fac_inverse(rad);
+	}
+}
+
+void GaussianAlphaYBlurOperation::executePixel(float *color, int x, int y, MemoryBuffer *inputBuffers[], void *data)
+{
+	MemoryBuffer *inputBuffer = (MemoryBuffer *)data;
+	float *buffer = inputBuffer->getBuffer();
+	int bufferwidth = inputBuffer->getWidth();
+	int bufferstartx = inputBuffer->getRect()->xmin;
+	int bufferstarty = inputBuffer->getRect()->ymin;
+
+	int miny = y - this->rad;
+	int maxy = y + this->rad;
+	int minx = x;
+	int maxx = x;
+	miny = max(miny, inputBuffer->getRect()->ymin);
+	minx = max(minx, inputBuffer->getRect()->xmin);
+	maxy = min(maxy, inputBuffer->getRect()->ymax);
+	maxx = min(maxx, inputBuffer->getRect()->xmax);
+
+	/* *** this is the main part which is different to 'GaussianYBlurOperation'  *** */
+	int step = getStep();
+
+	/* gauss */
+	float tempColor = 0.0f;
+	float overallmultiplyer = 0.0f;
+
+	/* dilate */
+	float value_max = buffer[(x * 4) + (y * 4 * bufferwidth)]; /* init with the current color to avoid unneeded lookups */
+	float distfacinv_max = 1.0f; /* 0 to 1 */
+
+	for (int ny = miny; ny < maxy; ny += step) {
+		int bufferindex = ((minx - bufferstartx) * 4) + ((ny - bufferstarty) * 4 * bufferwidth);
+
+		const int index = (ny - y) + this->rad;
+		float value = buffer[bufferindex];
+		float multiplyer;
+
+		/* gauss */
+		{
+			multiplyer = gausstab[index];
+			tempColor += value * multiplyer;
+			overallmultiplyer += multiplyer;
+		}
+
+		/* dilate - find most extreme color */
+		if (value > value_max) {
+#if 0
+			multiplyer = 1.0f - ((fabsf(y - ny)) / (float)this->rad);
+#else
+			multiplyer = distbuf_inv[index];
+#endif
+			value *= multiplyer;
+			if (value > value_max) {
+				value_max = value;
+				distfacinv_max = multiplyer;
+			}
+		}
+
+	}
+
+	/* blend between the max value and gauss blue - gives nice feather */
+	const float value_gauss = tempColor / overallmultiplyer;
+	const float value_final = (value_max * distfacinv_max) + (value_gauss * (1.0f - distfacinv_max));
+	color[0] = value_final;
+}
+
+void GaussianAlphaYBlurOperation::deinitExecution()
+{
+	BlurBaseOperation::deinitExecution();
+	delete [] this->gausstab;
+	this->gausstab = NULL;
+	delete [] this->distbuf_inv;
+	this->distbuf_inv = NULL;
+}
+
+bool GaussianAlphaYBlurOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
+{
+	rcti newInput;
+	rcti sizeInput;
+	sizeInput.xmin = 0;
+	sizeInput.ymin = 0;
+	sizeInput.xmax = 5;
+	sizeInput.ymax = 5;
+	
+	NodeOperation *operation = this->getInputOperation(1);
+	if (operation->determineDependingAreaOfInterest(&sizeInput, readOperation, output)) {
+		return true;
+	}
+	else {
+		if (this->sizeavailable && this->gausstab != NULL) {
+			newInput.xmax = input->xmax;
+			newInput.xmin = input->xmin;
+			newInput.ymax = input->ymax + rad;
+			newInput.ymin = input->ymin - rad;
+		}
+		else {
+			newInput.xmax = this->getWidth();
+			newInput.xmin = 0;
+			newInput.ymax = this->getHeight();
+			newInput.ymin = 0;
+		}
+		return NodeOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
+	}
+}