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Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_zoom.c')
-rw-r--r--nx-X11/extras/Mesa/src/mesa/swrast/s_zoom.c428
1 files changed, 428 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_zoom.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_zoom.c
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+++ b/nx-X11/extras/Mesa/src/mesa/swrast/s_zoom.c
@@ -0,0 +1,428 @@
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 5.1
+ *
+ * Copyright (C) 1999-2003 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 "imports.h"
+#include "colormac.h"
+
+#include "s_context.h"
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_zoom.h"
+
+
+/*
+ * Helper function called from _swrast_write_zoomed_rgba/rgb/index_span().
+ */
+static void
+zoom_span( GLcontext *ctx, const struct sw_span *span,
+ const GLvoid *src, GLint y0, GLenum format, GLint skipPixels )
+{
+ GLint r0, r1, row;
+ GLint c0, c1, skipCol;
+ GLint i, j;
+ const GLuint maxWidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+ struct sw_span zoomed;
+ struct span_arrays zoomed_arrays; /* this is big! */
+
+ /* no pixel arrays! must be horizontal spans. */
+ ASSERT((span->arrayMask & SPAN_XY) == 0);
+ ASSERT(span->primitive == GL_BITMAP);
+
+ INIT_SPAN(zoomed, GL_BITMAP, 0, 0, 0);
+ zoomed.array = &zoomed_arrays;
+
+ /* copy fog interp info */
+ zoomed.fog = span->fog;
+ zoomed.fogStep = span->fogStep;
+ /* XXX copy texcoord info? */
+
+ if (format == GL_RGBA || format == GL_RGB) {
+ /* copy Z info */
+ zoomed.z = span->z;
+ zoomed.zStep = span->zStep;
+ /* we'll generate an array of colorss */
+ zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
+ zoomed.arrayMask |= SPAN_RGBA;
+ }
+ else if (format == GL_COLOR_INDEX) {
+ /* copy Z info */
+ zoomed.z = span->z;
+ zoomed.zStep = span->zStep;
+ /* we'll generate an array of color indexes */
+ zoomed.interpMask = span->interpMask & ~SPAN_INDEX;
+ zoomed.arrayMask |= SPAN_INDEX;
+ }
+ else {
+ assert(format == GL_DEPTH_COMPONENT);
+ /* Copy color info */
+ zoomed.red = span->red;
+ zoomed.green = span->green;
+ zoomed.blue = span->blue;
+ zoomed.alpha = span->alpha;
+ zoomed.redStep = span->redStep;
+ zoomed.greenStep = span->greenStep;
+ zoomed.blueStep = span->blueStep;
+ zoomed.alphaStep = span->alphaStep;
+ /* we'll generate an array of depth values */
+ zoomed.interpMask = span->interpMask & ~SPAN_Z;
+ zoomed.arrayMask |= SPAN_Z;
+ }
+
+ /*
+ * Compute which columns to draw: [c0, c1)
+ */
+ c0 = (GLint) (span->x + skipPixels * ctx->Pixel.ZoomX);
+ c1 = (GLint) (span->x + (skipPixels + span->end) * ctx->Pixel.ZoomX);
+ if (c0 == c1) {
+ return;
+ }
+ else if (c1 < c0) {
+ /* swap */
+ GLint ctmp = c1;
+ c1 = c0;
+ c0 = ctmp;
+ }
+ if (c0 < 0) {
+ zoomed.x = 0;
+ zoomed.start = 0;
+ zoomed.end = c1;
+ skipCol = -c0;
+ }
+ else {
+ zoomed.x = c0;
+ zoomed.start = 0;
+ zoomed.end = c1 - c0;
+ skipCol = 0;
+ }
+ if (zoomed.end > maxWidth)
+ zoomed.end = maxWidth;
+
+ /*
+ * Compute which rows to draw: [r0, r1)
+ */
+ row = span->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) {
+ /* swap */
+ GLint rtmp = r1;
+ r1 = r0;
+ r0 = rtmp;
+ }
+
+ ASSERT(r0 < r1);
+ ASSERT(c0 < c1);
+
+ /*
+ * Trivial clip rejection testing.
+ */
+ if (r1 < 0) /* below window */
+ return;
+ if (r0 >= (GLint) ctx->DrawBuffer->Height) /* above window */
+ return;
+ if (c1 < 0) /* left of window */
+ return;
+ if (c0 >= (GLint) ctx->DrawBuffer->Width) /* right of window */
+ return;
+
+ /* zoom the span horizontally */
+ if (format == GL_RGBA) {
+ const GLchan (*rgba)[4] = (const GLchan (*)[4]) src;
+ if (ctx->Pixel.ZoomX == -1.0F) {
+ /* common case */
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = span->end - (j + skipCol) - 1;
+ COPY_CHAN4(zoomed.array->rgba[j], rgba[i]);
+ }
+ }
+ else {
+ /* general solution */
+ const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = (GLint) ((j + skipCol) * xscale);
+ if (ctx->Pixel.ZoomX < 0.0) {
+ ASSERT(i <= 0);
+ i = span->end + i - 1;
+ }
+ ASSERT(i >= 0);
+ ASSERT(i < (GLint) span->end);
+ COPY_CHAN4(zoomed.array->rgba[j], rgba[i]);
+ }
+ }
+ }
+ else if (format == GL_RGB) {
+ const GLchan (*rgb)[3] = (const GLchan (*)[3]) src;
+ if (ctx->Pixel.ZoomX == -1.0F) {
+ /* common case */
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = span->end - (j + skipCol) - 1;
+ zoomed.array->rgba[j][0] = rgb[i][0];
+ zoomed.array->rgba[j][1] = rgb[i][1];
+ zoomed.array->rgba[j][2] = rgb[i][2];
+ zoomed.array->rgba[j][3] = CHAN_MAX;
+ }
+ }
+ else {
+ /* general solution */
+ const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = (GLint) ((j + skipCol) * xscale);
+ if (ctx->Pixel.ZoomX < 0.0) {
+ ASSERT(i <= 0);
+ i = span->end + i - 1;
+ }
+ ASSERT(i >= 0);
+ ASSERT(i < (GLint) span->end);
+ zoomed.array->rgba[j][0] = rgb[i][0];
+ zoomed.array->rgba[j][1] = rgb[i][1];
+ zoomed.array->rgba[j][2] = rgb[i][2];
+ zoomed.array->rgba[j][3] = CHAN_MAX;
+ }
+ }
+ }
+ else if (format == GL_COLOR_INDEX) {
+ const GLuint *indexes = (const GLuint *) src;
+ if (ctx->Pixel.ZoomX == -1.0F) {
+ /* common case */
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = span->end - (j + skipCol) - 1;
+ zoomed.array->index[j] = indexes[i];
+ }
+ }
+ else {
+ /* general solution */
+ const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = (GLint) ((j + skipCol) * xscale);
+ if (ctx->Pixel.ZoomX < 0.0) {
+ ASSERT(i <= 0);
+ i = span->end + i - 1;
+ }
+ ASSERT(i >= 0);
+ ASSERT(i < (GLint) span->end);
+ zoomed.array->index[j] = indexes[i];
+ }
+ }
+ }
+ else {
+ const GLdepth *zValues = (const GLuint *) src;
+ assert(format == GL_DEPTH_COMPONENT);
+ if (ctx->Pixel.ZoomX == -1.0F) {
+ /* common case */
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = span->end - (j + skipCol) - 1;
+ zoomed.array->z[j] = zValues[i];
+ }
+ }
+ else {
+ /* general solution */
+ const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = (GLint) ((j + skipCol) * xscale);
+ if (ctx->Pixel.ZoomX < 0.0) {
+ ASSERT(i <= 0);
+ i = span->end + i - 1;
+ }
+ ASSERT(i >= 0);
+ ASSERT(i < (GLint) span->end);
+ zoomed.array->z[j] = zValues[i];
+ }
+ }
+ /* Now, fall into either the RGB or COLOR_INDEX path below */
+ if (ctx->Visual.rgbMode)
+ format = GL_RGBA;
+ else
+ format = GL_COLOR_INDEX;
+ }
+
+
+ /* write the span in rows [r0, r1) */
+ if (format == GL_RGBA || format == GL_RGB) {
+ /* Writing the span may modify the colors, so make a backup now if we're
+ * going to call _swrast_write_zoomed_span() more than once.
+ * Also, clipping may change the span end value, so store it as well.
+ */
+ GLchan rgbaSave[MAX_WIDTH][4];
+ const GLint end = zoomed.end; /* save */
+ if (r1 - r0 > 1) {
+ MEMCPY(rgbaSave, zoomed.array->rgba, zoomed.end * 4 * sizeof(GLchan));
+ }
+ for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) {
+ _swrast_write_rgba_span(ctx, &zoomed);
+ zoomed.end = end; /* restore */
+ if (r1 - r0 > 1) {
+ /* restore the colors */
+ MEMCPY(zoomed.array->rgba, rgbaSave, zoomed.end*4 * sizeof(GLchan));
+ }
+ }
+ }
+ else if (format == GL_COLOR_INDEX) {
+ GLuint indexSave[MAX_WIDTH];
+ const GLint end = zoomed.end; /* save */
+ if (r1 - r0 > 1) {
+ MEMCPY(indexSave, zoomed.array->index, zoomed.end * sizeof(GLuint));
+ }
+ for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) {
+ _swrast_write_index_span(ctx, &zoomed);
+ zoomed.end = end; /* restore */
+ if (r1 - r0 > 1) {
+ /* restore the colors */
+ MEMCPY(zoomed.array->index, indexSave, zoomed.end * sizeof(GLuint));
+ }
+ }
+ }
+}
+
+
+void
+_swrast_write_zoomed_rgba_span( GLcontext *ctx, const struct sw_span *span,
+ CONST GLchan rgba[][4], GLint y0,
+ GLint skipPixels )
+{
+ zoom_span(ctx, span, (const GLvoid *) rgba, y0, GL_RGBA, skipPixels);
+}
+
+
+void
+_swrast_write_zoomed_rgb_span( GLcontext *ctx, const struct sw_span *span,
+ CONST GLchan rgb[][3], GLint y0,
+ GLint skipPixels )
+{
+ zoom_span(ctx, span, (const GLvoid *) rgb, y0, GL_RGB, skipPixels);
+}
+
+
+void
+_swrast_write_zoomed_index_span( GLcontext *ctx, const struct sw_span *span,
+ GLint y0, GLint skipPixels )
+{
+ zoom_span(ctx, span, (const GLvoid *) span->array->index, y0,
+ GL_COLOR_INDEX, skipPixels);
+}
+
+
+void
+_swrast_write_zoomed_depth_span( GLcontext *ctx, const struct sw_span *span,
+ GLint y0, GLint skipPixels )
+{
+ zoom_span(ctx, span, (const GLvoid *) span->array->z, y0,
+ GL_DEPTH_COMPONENT, skipPixels);
+}
+
+
+/*
+ * As above, but write stencil values.
+ */
+void
+_swrast_write_zoomed_stencil_span( GLcontext *ctx,
+ GLuint n, GLint x, GLint y,
+ const GLstencil stencil[], GLint y0,
+ GLint skipPixels )
+{
+ 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 );
+
+ (void) skipPixels; /* XXX this shouldn't be ignored */
+
+ /* compute width of output row */
+ m = (GLint) FABSF( 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 >= (GLint) ctx->DrawBuffer->Height &&
+ r1 >= (GLint) 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++) {
+ _swrast_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
+ }
+}
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