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-rw-r--r--src/mesa/swrast/s_zoom.c453
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diff --git a/src/mesa/swrast/s_zoom.c b/src/mesa/swrast/s_zoom.c
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+++ b/src/mesa/swrast/s_zoom.c
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+/* $Id: s_zoom.c,v 1.1 2000/10/31 18:00:05 keithw Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 3.5
+ *
+ * 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.
+ */
+
+#include "glheader.h"
+#include "macros.h"
+
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_zoom.h"
+
+
+
+/*
+ * Write a span of pixels to the frame buffer while applying a pixel zoom.
+ * This is only used by glDrawPixels and glCopyPixels.
+ * Input: n - number of pixels in input row
+ * x, y - destination of the span
+ * z - depth values for the span
+ * red, green, blue, alpha - array of colors
+ * y0 - location of first row in the image we're drawing.
+ */
+void
+gl_write_zoomed_rgba_span( GLcontext *ctx,
+ GLuint n, GLint x, GLint y, const GLdepth z[],
+ const GLfixed *fog,
+ CONST GLchan rgba[][4], GLint y0 )
+{
+ GLint m;
+ GLint r0, r1, row, r;
+ GLint i, j, skipcol;
+ GLchan zrgba[MAX_WIDTH][4]; /* zoomed pixel colors */
+ GLdepth zdepth[MAX_WIDTH]; /* zoomed depth values */
+ GLfixed zfog[MAX_WIDTH]; /* zoomed fog values */
+ GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+ const GLuint *srcRGBA32 = (const GLuint *) rgba;
+ GLuint *dstRGBA32 = (GLuint *) zrgba;
+
+ /* compute width of output row */
+ m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+ if (m==0) {
+ return;
+ }
+ if (ctx->Pixel.ZoomX<0.0) {
+ /* adjust x coordinate for left/right mirroring */
+ x = x - m;
+ }
+
+ /* compute which rows to draw */
+ row = y-y0;
+ r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+ r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+ if (r0==r1) {
+ return;
+ }
+ else if (r1<r0) {
+ GLint rtmp = r1;
+ r1 = r0;
+ r0 = rtmp;
+ }
+
+ /* return early if r0...r1 is above or below window */
+ if (r0<0 && r1<0) {
+ /* below window */
+ return;
+ }
+ if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+ /* above window */
+ return;
+ }
+
+ /* check if left edge is outside window */
+ skipcol = 0;
+ if (x<0) {
+ skipcol = -x;
+ m += x;
+ }
+ /* make sure span isn't too long or short */
+ if (m>maxwidth) {
+ m = maxwidth;
+ }
+ else if (m<=0) {
+ return;
+ }
+
+ assert( m <= MAX_WIDTH );
+
+ /* zoom the span horizontally */
+ if (ctx->Pixel.ZoomX==-1.0F) {
+ /* n==m */
+ for (j=0;j<m;j++) {
+ i = n - (j+skipcol) - 1;
+ dstRGBA32[j] = srcRGBA32[i];
+ zdepth[j] = z[i];
+ }
+ if (fog && ctx->Fog.Enabled) {
+ for (j=0;j<m;j++) {
+ i = n - (j+skipcol) - 1;
+ zfog[j] = fog[i];
+ }
+ }
+ }
+ else {
+ GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j=0;j<m;j++) {
+ i = (GLint) ((j+skipcol) * xscale);
+ if (i<0) i = n + i - 1;
+ dstRGBA32[j] = srcRGBA32[i];
+ zdepth[j] = z[i];
+ }
+ if (fog && ctx->Fog.Enabled) {
+ for (j=0;j<m;j++) {
+ i = (GLint) ((j+skipcol) * xscale);
+ if (i<0) i = n + i - 1;
+ zfog[j] = fog[i];
+ }
+ }
+ }
+
+ /* write the span */
+ for (r=r0; r<r1; r++) {
+ gl_write_rgba_span( ctx, m, x+skipcol, r, zdepth,
+ (fog ? zfog : 0),
+ zrgba, GL_BITMAP );
+ }
+}
+
+
+
+void
+gl_write_zoomed_rgb_span( GLcontext *ctx,
+ GLuint n, GLint x, GLint y, const GLdepth z[],
+ const GLfixed *fog,
+ CONST GLchan rgb[][3], GLint y0 )
+{
+ GLint m;
+ GLint r0, r1, row, r;
+ GLint i, j, skipcol;
+ GLchan zrgba[MAX_WIDTH][4]; /* zoomed pixel colors */
+ GLdepth zdepth[MAX_WIDTH]; /* zoomed depth values */
+ GLfixed zfog[MAX_WIDTH]; /* zoomed fog values */
+ GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+
+ /* compute width of output row */
+ m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+ if (m==0) {
+ return;
+ }
+ if (ctx->Pixel.ZoomX<0.0) {
+ /* adjust x coordinate for left/right mirroring */
+ x = x - m;
+ }
+
+ /* compute which rows to draw */
+ row = y-y0;
+ r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+ r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+ if (r0==r1) {
+ return;
+ }
+ else if (r1<r0) {
+ GLint rtmp = r1;
+ r1 = r0;
+ r0 = rtmp;
+ }
+
+ /* return early if r0...r1 is above or below window */
+ if (r0<0 && r1<0) {
+ /* below window */
+ return;
+ }
+ if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+ /* above window */
+ return;
+ }
+
+ /* check if left edge is outside window */
+ skipcol = 0;
+ if (x<0) {
+ skipcol = -x;
+ m += x;
+ }
+ /* make sure span isn't too long or short */
+ if (m>maxwidth) {
+ m = maxwidth;
+ }
+ else if (m<=0) {
+ return;
+ }
+
+ assert( m <= MAX_WIDTH );
+
+ /* zoom the span horizontally */
+ if (ctx->Pixel.ZoomX==-1.0F) {
+ /* n==m */
+ for (j=0;j<m;j++) {
+ i = n - (j+skipcol) - 1;
+ zrgba[j][0] = rgb[i][0];
+ zrgba[j][1] = rgb[i][1];
+ zrgba[j][2] = rgb[i][2];
+ zrgba[j][3] = CHAN_MAX;
+ zdepth[j] = z[i];
+ }
+ if (fog && ctx->Fog.Enabled) {
+ for (j=0;j<m;j++) {
+ i = n - (j+skipcol) - 1;
+ zfog[j] = fog[i];
+ }
+ }
+ }
+ else {
+ GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j=0;j<m;j++) {
+ i = (GLint) ((j+skipcol) * xscale);
+ if (i<0) i = n + i - 1;
+ zrgba[j][0] = rgb[i][0];
+ zrgba[j][1] = rgb[i][1];
+ zrgba[j][2] = rgb[i][2];
+ zrgba[j][3] = CHAN_MAX;
+ zdepth[j] = z[i];
+ }
+ if (fog && ctx->Fog.Enabled) {
+ for (j=0;j<m;j++) {
+ i = (GLint) ((j+skipcol) * xscale);
+ if (i<0) i = n + i - 1;
+ zfog[j] = fog[i];
+ }
+ }
+ }
+
+ /* write the span */
+ for (r=r0; r<r1; r++) {
+ gl_write_rgba_span( ctx, m, x+skipcol, r, zdepth,
+ (fog ? zfog : 0), zrgba, GL_BITMAP );
+ }
+}
+
+
+
+/*
+ * As above, but write CI pixels.
+ */
+void
+gl_write_zoomed_index_span( GLcontext *ctx,
+ GLuint n, GLint x, GLint y, const GLdepth z[],
+ const GLfixed *fog,
+ const GLuint indexes[], GLint y0 )
+{
+ GLint m;
+ GLint r0, r1, row, r;
+ GLint i, j, skipcol;
+ GLuint zindexes[MAX_WIDTH]; /* zoomed color indexes */
+ GLdepth zdepth[MAX_WIDTH]; /* zoomed depth values */
+ GLfixed zfog[MAX_WIDTH]; /* zoomed fog values */
+ GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+
+ /* compute width of output row */
+ m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+ if (m==0) {
+ return;
+ }
+ if (ctx->Pixel.ZoomX<0.0) {
+ /* adjust x coordinate for left/right mirroring */
+ x = x - m;
+ }
+
+ /* compute which rows to draw */
+ row = y-y0;
+ r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+ r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+ if (r0==r1) {
+ return;
+ }
+ else if (r1<r0) {
+ GLint rtmp = r1;
+ r1 = r0;
+ r0 = rtmp;
+ }
+
+ /* return early if r0...r1 is above or below window */
+ if (r0<0 && r1<0) {
+ /* below window */
+ return;
+ }
+ if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+ /* above window */
+ return;
+ }
+
+ /* check if left edge is outside window */
+ skipcol = 0;
+ if (x<0) {
+ skipcol = -x;
+ m += x;
+ }
+ /* make sure span isn't too long or short */
+ if (m>maxwidth) {
+ m = maxwidth;
+ }
+ else if (m<=0) {
+ return;
+ }
+
+ assert( m <= MAX_WIDTH );
+
+ /* zoom the span horizontally */
+ if (ctx->Pixel.ZoomX==-1.0F) {
+ /* n==m */
+ for (j=0;j<m;j++) {
+ i = n - (j+skipcol) - 1;
+ zindexes[j] = indexes[i];
+ zdepth[j] = z[i];
+ }
+ if (fog && ctx->Fog.Enabled) {
+ for (j=0;j<m;j++) {
+ i = n - (j+skipcol) - 1;
+ zfog[j] = fog[i];
+ }
+ }
+ }
+ else {
+ GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j=0;j<m;j++) {
+ i = (GLint) ((j+skipcol) * xscale);
+ if (i<0) i = n + i - 1;
+ zindexes[j] = indexes[i];
+ zdepth[j] = z[i];
+ }
+ if (fog && ctx->Fog.Enabled) {
+ for (j=0;j<m;j++) {
+ i = (GLint) ((j+skipcol) * xscale);
+ if (i<0) i = n + i - 1;
+ zfog[j] = fog[i];
+ }
+ }
+ }
+
+ /* write the span */
+ for (r=r0; r<r1; r++) {
+ gl_write_index_span( ctx, m, x+skipcol, r, zdepth,
+ (fog ? zfog : 0), zindexes, GL_BITMAP );
+ }
+}
+
+
+
+/*
+ * As above, but write stencil values.
+ */
+void
+gl_write_zoomed_stencil_span( GLcontext *ctx,
+ GLuint n, GLint x, GLint y,
+ const GLstencil stencil[], GLint y0 )
+{
+ GLint m;
+ GLint r0, r1, row, r;
+ GLint i, j, skipcol;
+ GLstencil zstencil[MAX_WIDTH]; /* zoomed stencil values */
+ GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+
+ /* compute width of output row */
+ m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+ if (m==0) {
+ return;
+ }
+ if (ctx->Pixel.ZoomX<0.0) {
+ /* adjust x coordinate for left/right mirroring */
+ x = x - m;
+ }
+
+ /* compute which rows to draw */
+ row = y-y0;
+ r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+ r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+ if (r0==r1) {
+ return;
+ }
+ else if (r1<r0) {
+ GLint rtmp = r1;
+ r1 = r0;
+ r0 = rtmp;
+ }
+
+ /* return early if r0...r1 is above or below window */
+ if (r0<0 && r1<0) {
+ /* below window */
+ return;
+ }
+ if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+ /* above window */
+ return;
+ }
+
+ /* check if left edge is outside window */
+ skipcol = 0;
+ if (x<0) {
+ skipcol = -x;
+ m += x;
+ }
+ /* make sure span isn't too long or short */
+ if (m>maxwidth) {
+ m = maxwidth;
+ }
+ else if (m<=0) {
+ return;
+ }
+
+ assert( m <= MAX_WIDTH );
+
+ /* zoom the span horizontally */
+ if (ctx->Pixel.ZoomX==-1.0F) {
+ /* n==m */
+ for (j=0;j<m;j++) {
+ i = n - (j+skipcol) - 1;
+ zstencil[j] = stencil[i];
+ }
+ }
+ else {
+ GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j=0;j<m;j++) {
+ i = (GLint) ((j+skipcol) * xscale);
+ if (i<0) i = n + i - 1;
+ zstencil[j] = stencil[i];
+ }
+ }
+
+ /* write the span */
+ for (r=r0; r<r1; r++) {
+ _mesa_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
+ }
+}
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