--- /dev/null
+/* $Id: convolve.c,v 1.1 2000/07/12 13:00:09 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 3.3
+ *
+ * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * Image convolution functions.
+ *
+ * Notes: filter kernel elements are indexed by <n> and <m> as in
+ * the GL spec.
+ */
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include "glheader.h"
+#include "types.h"
+#endif
+
+
+void
+_mesa_convolve_1d_reduce(GLint srcWidth, const GLfloat src[][4],
+ GLint filterWidth, const GLfloat filter[][4],
+ GLfloat dest[][4])
+{
+ const GLint dstWidth = srcWidth - (filterWidth - 1);
+ GLint i, n;
+
+ if (dstWidth <= 0)
+ return; /* null result */
+
+ for (i = 0; i < dstWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (n = 0; n < filterWidth; n++) {
+ sumR += src[i + n][RCOMP] * filter[n][RCOMP];
+ sumG += src[i + n][GCOMP] * filter[n][GCOMP];
+ sumB += src[i + n][BCOMP] * filter[n][BCOMP];
+ sumA += src[i + n][ACOMP] * filter[n][ACOMP];
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
+
+
+void
+_mesa_convolve_1d_constant(GLint srcWidth, const GLfloat src[][4],
+ GLint filterWidth, const GLfloat filter[][4],
+ const GLfloat borderColor[4], GLfloat dest[][4])
+{
+ const GLint halfFilterWidth = filterWidth / 2;
+ GLint i, n;
+
+ for (i = 0; i < srcWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (n = 0; n < filterWidth; n++) {
+ if (i + n < halfFilterWidth || i + n - halfFilterWidth >= srcWidth) {
+ sumR += borderColor[RCOMP] * filter[n][RCOMP];
+ sumG += borderColor[GCOMP] * filter[n][GCOMP];
+ sumB += borderColor[BCOMP] * filter[n][BCOMP];
+ sumA += borderColor[ACOMP] * filter[n][ACOMP];
+ }
+ else {
+ sumR += src[i + n - halfFilterWidth][RCOMP] * filter[n][RCOMP];
+ sumG += src[i + n - halfFilterWidth][GCOMP] * filter[n][GCOMP];
+ sumB += src[i + n - halfFilterWidth][BCOMP] * filter[n][BCOMP];
+ sumA += src[i + n - halfFilterWidth][ACOMP] * filter[n][ACOMP];
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
+
+
+void
+_mesa_convolve_1d_replicate(GLint srcWidth, const GLfloat src[][4],
+ GLint filterWidth, const GLfloat filter[][4],
+ GLfloat dest[][4])
+{
+ const GLint halfFilterWidth = filterWidth / 2;
+ GLint i, n;
+
+ for (i = 0; i < srcWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (n = 0; n < filterWidth; n++) {
+ if (i + n < halfFilterWidth) {
+ sumR += src[0][RCOMP] * filter[n][RCOMP];
+ sumG += src[0][GCOMP] * filter[n][GCOMP];
+ sumB += src[0][BCOMP] * filter[n][BCOMP];
+ sumA += src[0][ACOMP] * filter[n][ACOMP];
+ }
+ else if (i + n - halfFilterWidth >= srcWidth) {
+ sumR += src[srcWidth - 1][RCOMP] * filter[n][RCOMP];
+ sumG += src[srcWidth - 1][GCOMP] * filter[n][GCOMP];
+ sumB += src[srcWidth - 1][BCOMP] * filter[n][BCOMP];
+ sumA += src[srcWidth - 1][ACOMP] * filter[n][ACOMP];
+ }
+ else {
+ sumR += src[i + n - halfFilterWidth][RCOMP] * filter[n][RCOMP];
+ sumG += src[i + n - halfFilterWidth][GCOMP] * filter[n][GCOMP];
+ sumB += src[i + n - halfFilterWidth][BCOMP] * filter[n][BCOMP];
+ sumA += src[i + n - halfFilterWidth][ACOMP] * filter[n][ACOMP];
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
+
+
+/*
+ * <src> is the source image width width = srcWidth, height = filterHeight.
+ * <filter> has width <filterWidth> and height <filterHeight>.
+ * <dst> is a 1-D image span of width <srcWidth> - (<filterWidth> - 1).
+ */
+void
+_mesa_convolve_2d_reduce(GLint srcWidth, GLint srcHeight,
+ const GLfloat src[][4],
+ GLint filterWidth, GLint filterHeight,
+ const GLfloat filter[][4],
+ GLfloat dest[][4])
+{
+ const GLint dstWidth = srcWidth - (filterWidth - 1);
+ GLint i, n, m;
+
+ if (dstWidth <= 0)
+ return; /* null result */
+
+ /* XXX todo */
+ for (i = 0; i < dstWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (n = 0; n < filterHeight; n++) {
+ for (m = 0; m < filterWidth; m++) {
+ const GLint k = n * srcWidth + i + m;
+ sumR += src[k][RCOMP] * filter[n][RCOMP];
+ sumG += src[k][GCOMP] * filter[n][GCOMP];
+ sumB += src[k][BCOMP] * filter[n][BCOMP];
+ sumA += src[k][ACOMP] * filter[n][ACOMP];
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
+
+
+void
+_mesa_convolve_2d_constant(GLint srcWidth, GLint srcHeight,
+ const GLfloat src[][4],
+ GLint filterWidth, GLint filterHeight,
+ const GLfloat filter[][4],
+ GLfloat dest[][4],
+ const GLfloat borderColor[4])
+{
+ const GLint halfFilterWidth = filterWidth / 2;
+ GLint i, n, m;
+
+ for (i = 0; i < srcWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (m = 0; m < filterHeight; m++) {
+ const GLfloat (*filterRow)[4] = filter + m * filterWidth;
+ for (n = 0; n < filterWidth; n++) {
+ if (i + n < halfFilterWidth ||
+ i + n - halfFilterWidth >= srcWidth) {
+ sumR += borderColor[RCOMP] * filterRow[n][RCOMP];
+ sumG += borderColor[GCOMP] * filterRow[n][GCOMP];
+ sumB += borderColor[BCOMP] * filterRow[n][BCOMP];
+ sumA += borderColor[ACOMP] * filterRow[n][ACOMP];
+ }
+ else {
+ const GLint k = m * srcWidth + i + n - halfFilterWidth;
+ sumR += src[k][RCOMP] * filterRow[n][RCOMP];
+ sumG += src[k][GCOMP] * filterRow[n][GCOMP];
+ sumB += src[k][BCOMP] * filterRow[n][BCOMP];
+ sumA += src[k][ACOMP] * filterRow[n][ACOMP];
+ }
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
+
+
+void
+_mesa_convolve_2d_replicate(GLint srcWidth, GLint srcHeight,
+ const GLfloat src[][4],
+ GLint filterWidth, GLint filterHeight,
+ const GLfloat filter[][4],
+ GLfloat dest[][4])
+{
+ const GLint halfFilterWidth = filterWidth / 2;
+ GLint i, n, m;
+
+ for (i = 0; i < srcWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (m = 0; m < filterHeight; m++) {
+ const GLfloat (*filterRow)[4] = filter + m * filterWidth;
+ for (n = 0; n < filterWidth; n++) {
+ if (i + n < halfFilterWidth) {
+ const GLint k = m * srcWidth + 0;
+ sumR += src[k][RCOMP] * filterRow[n][RCOMP];
+ sumG += src[k][GCOMP] * filterRow[n][GCOMP];
+ sumB += src[k][BCOMP] * filterRow[n][BCOMP];
+ sumA += src[k][ACOMP] * filterRow[n][ACOMP];
+ }
+ else if (i + n - halfFilterWidth >= srcWidth) {
+ const GLint k = m * srcWidth + srcWidth - 1;
+ sumR += src[k][RCOMP] * filterRow[n][RCOMP];
+ sumG += src[k][GCOMP] * filterRow[n][GCOMP];
+ sumB += src[k][BCOMP] * filterRow[n][BCOMP];
+ sumA += src[k][ACOMP] * filterRow[n][ACOMP];
+ }
+ else {
+ const GLint k = m * srcWidth + i + n - halfFilterWidth;
+ sumR += src[k][RCOMP] * filterRow[n][RCOMP];
+ sumG += src[k][GCOMP] * filterRow[n][GCOMP];
+ sumB += src[k][BCOMP] * filterRow[n][BCOMP];
+ sumA += src[k][ACOMP] * filterRow[n][ACOMP];
+ }
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
+
+
+void
+_mesa_convolve_sep_constant(GLint srcWidth, GLint srcHeight,
+ const GLfloat src[][4],
+ GLint filterWidth, GLint filterHeight,
+ const GLfloat rowFilt[][4],
+ const GLfloat colFilt[][4],
+ GLfloat dest[][4],
+ const GLfloat borderColor[4])
+{
+ const GLint halfFilterWidth = filterWidth / 2;
+ GLint i, n, m;
+
+ for (i = 0; i < srcWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (m = 0; m < filterHeight; m++) {
+ for (n = 0; n < filterWidth; n++) {
+ if (i + n < halfFilterWidth ||
+ i + n - halfFilterWidth >= srcWidth) {
+ sumR += borderColor[RCOMP] * rowFilt[n][RCOMP] * colFilt[m][RCOMP];
+ sumG += borderColor[GCOMP] * rowFilt[n][GCOMP] * colFilt[m][GCOMP];
+ sumB += borderColor[BCOMP] * rowFilt[n][BCOMP] * colFilt[m][BCOMP];
+ sumA += borderColor[ACOMP] * rowFilt[n][ACOMP] * colFilt[m][ACOMP];
+ }
+ else {
+ const GLint k = m * srcWidth + i + n - halfFilterWidth;
+ sumR += src[k][RCOMP] * rowFilt[n][RCOMP] * colFilt[m][RCOMP];
+ sumG += src[k][GCOMP] * rowFilt[n][GCOMP] * colFilt[m][GCOMP];
+ sumB += src[k][BCOMP] * rowFilt[n][BCOMP] * colFilt[m][BCOMP];
+ sumA += src[k][ACOMP] * rowFilt[n][ACOMP] * colFilt[m][ACOMP];
+ }
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
+
+
+void
+_mesa_convolve_sep_reduce(GLint srcWidth, GLint srcHeight,
+ const GLfloat src[][4],
+ GLint filterWidth, GLint filterHeight,
+ const GLfloat rowFilt[][4],
+ const GLfloat colFilt[][4],
+ GLfloat dest[][4])
+{
+#if 00
+ const GLint halfFilterWidth = filterWidth / 2;
+ GLint i, n, m;
+
+ for (i = 0; i < srcWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (m = 0; m < filterHeight; m++) {
+ for (n = 0; n < filterWidth; n++) {
+ if (i + n < halfFilterWidth ||
+ i + n - halfFilterWidth >= srcWidth) {
+ sumR += borderColor[RCOMP] * rowFilt[n][RCOMP] * colFilt[m][RCOMP];
+ sumG += borderColor[GCOMP] * rowFilt[n][GCOMP] * colFilt[m][GCOMP];
+ sumB += borderColor[BCOMP] * rowFilt[n][BCOMP] * colFilt[m][BCOMP];
+ sumA += borderColor[ACOMP] * rowFilt[n][ACOMP] * colFilt[m][ACOMP];
+ }
+ else {
+ const GLint k = m * srcWidth + i + n - halfFilterWidth;
+ sumR += src[k][RCOMP] * rowFilt[n][RCOMP] * colFilt[m][RCOMP];
+ sumG += src[k][GCOMP] * rowFilt[n][GCOMP] * colFilt[m][GCOMP];
+ sumB += src[k][BCOMP] * rowFilt[n][BCOMP] * colFilt[m][BCOMP];
+ sumA += src[k][ACOMP] * rowFilt[n][ACOMP] * colFilt[m][ACOMP];
+ }
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+#endif
+}
+
+
+void
+_mesa_convolve_sep_replicate(GLint srcWidth, GLint srcHeight,
+ const GLfloat src[][4],
+ GLint filterWidth, GLint filterHeight,
+ const GLfloat rowFilt[][4],
+ const GLfloat colFilt[][4],
+ GLfloat dest[][4])
+{
+ const GLint halfFilterWidth = filterWidth / 2;
+ GLint i, n, m;
+
+ for (i = 0; i < srcWidth; i++) {
+ GLfloat sumR = 0.0;
+ GLfloat sumG = 0.0;
+ GLfloat sumB = 0.0;
+ GLfloat sumA = 0.0;
+ for (m = 0; m < filterHeight; m++) {
+ for (n = 0; n < filterWidth; n++) {
+ if (i + n < halfFilterWidth) {
+ const GLint k = m * srcWidth + 0;
+ sumR += src[k][RCOMP] * rowFilt[n][RCOMP] * colFilt[m][RCOMP];
+ sumG += src[k][GCOMP] * rowFilt[n][GCOMP] * colFilt[m][GCOMP];
+ sumB += src[k][BCOMP] * rowFilt[n][BCOMP] * colFilt[m][BCOMP];
+ sumA += src[k][ACOMP] * rowFilt[n][ACOMP] * colFilt[m][ACOMP];
+ }
+ else if (i + n - halfFilterWidth >= srcWidth) {
+ const GLint k = m * srcWidth + srcWidth - 1;
+ sumR += src[k][RCOMP] * rowFilt[n][RCOMP] * colFilt[m][RCOMP];
+ sumG += src[k][GCOMP] * rowFilt[n][GCOMP] * colFilt[m][GCOMP];
+ sumB += src[k][BCOMP] * rowFilt[n][BCOMP] * colFilt[m][BCOMP];
+ sumA += src[k][ACOMP] * rowFilt[n][ACOMP] * colFilt[m][ACOMP];
+ }
+ else {
+ const GLint k = m * srcWidth + i + n - halfFilterWidth;
+ sumR += src[k][RCOMP] * rowFilt[n][RCOMP] * colFilt[m][RCOMP];
+ sumG += src[k][GCOMP] * rowFilt[n][GCOMP] * colFilt[m][GCOMP];
+ sumB += src[k][BCOMP] * rowFilt[n][BCOMP] * colFilt[m][BCOMP];
+ sumA += src[k][ACOMP] * rowFilt[n][ACOMP] * colFilt[m][ACOMP];
+ }
+ }
+ }
+ dest[i][RCOMP] = sumR;
+ dest[i][GCOMP] = sumG;
+ dest[i][BCOMP] = sumB;
+ dest[i][ACOMP] = sumA;
+ }
+}
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