-/* $Id: s_zoom.c,v 1.4 2001/03/12 00:48:42 gareth Exp $ */
+/* $Id: s_zoom.c,v 1.24 2003/03/25 02:23:48 brianp Exp $ */
/*
* Mesa 3-D graphics library
- * Version: 3.5
+ * Version: 5.1
*
- * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
+ * 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"),
#include "glheader.h"
#include "macros.h"
+#include "imports.h"
+#include "colormac.h"
#include "s_context.h"
#include "s_span.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.
+ * Helper function called from _swrast_write_zoomed_rgba/rgb/index_span().
*/
-void
-_mesa_write_zoomed_rgba_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y, const GLdepth z[],
- const GLfixed *fog,
- CONST GLchan rgba[][4], GLint y0 )
+static void
+zoom_span( GLcontext *ctx, const struct sw_span *span,
+ const GLvoid *src, GLint y0, GLenum format, GLint skipPixels )
{
- 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) {
+ GLint r0, r1, row;
+ GLint c0, c1, skipCol;
+ GLint i, j;
+ const GLuint maxWidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+ GLchan rgbaSave[MAX_WIDTH][4];
+ GLuint indexSave[MAX_WIDTH];
+ const GLchan (*rgba)[4] = (const GLchan (*)[4]) src;
+ const GLchan (*rgb)[3] = (const GLchan (*)[3]) src;
+ const GLuint *indexes = (const GLuint *) src;
+ struct sw_span zoomed;
+ struct span_arrays zoomed_arrays; /* this is big! */
+
+ /* no pixel arrays! */
+ ASSERT((span->arrayMask & SPAN_XY) == 0);
+ ASSERT(span->primitive == GL_BITMAP);
+
+ INIT_SPAN(zoomed, GL_BITMAP, 0, 0, 0);
+ zoomed.array = &zoomed_arrays;
+
+ zoomed.z = span->z;
+ zoomed.zStep = span->zStep; /* span->zStep == 0 */
+ zoomed.fog = span->fog;
+ zoomed.fogStep = span->fogStep;
+ if (format == GL_RGBA || format == GL_RGB) {
+ zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
+ zoomed.arrayMask |= SPAN_RGBA;
+ }
+ else if (format == GL_COLOR_INDEX) {
+ zoomed.interpMask = span->interpMask & ~SPAN_INDEX;
+ zoomed.arrayMask |= SPAN_INDEX;
+ }
+
+ /*
+ * Compute which columns to draw: [c0, c1)
+ */
+#if 0
+ c0 = (GLint) span->x;
+ c1 = (GLint) (span->x + span->end * ctx->Pixel.ZoomX);
+#else
+ c0 = (GLint) (span->x + skipPixels * ctx->Pixel.ZoomX);
+ c1 = (GLint) (span->x + (skipPixels + span->end) * ctx->Pixel.ZoomX);
+#endif
+ if (c0 == c1) {
return;
}
- if (ctx->Pixel.ZoomX<0.0) {
- /* adjust x coordinate for left/right mirroring */
- x = x - m;
+ else if (c1 < c0) {
+ /* swap */
+ GLint ctmp = c1;
+ c1 = c0;
+ c0 = ctmp;
}
-
- /* compute which rows to draw */
- row = y-y0;
+ 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) {
+ if (r0 == r1) {
return;
}
- else if (r1<r0) {
+ else if (r1 < r0) {
+ /* swap */
GLint rtmp = r1;
r1 = r0;
r0 = rtmp;
}
- /* return early if r0...r1 is above or below window */
- if (r0<0 && r1<0) {
- /* below window */
+ ASSERT(r0 < r1);
+ ASSERT(c0 < c1);
+
+ /*
+ * Trivial clip rejection testing.
+ */
+ if (r1 < 0) /* below window */
return;
- }
- if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
- /* above window */
+ if (r0 >= (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) {
+ if (c1 < 0) /* left of window */
+ return;
+ if (c0 >= (GLint) ctx->DrawBuffer->Width) /* right of window */
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 (format == GL_RGBA) {
+ 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]);
+ }
}
- if (fog && ctx->Fog.Enabled) {
- for (j=0;j<m;j++) {
- i = n - (j+skipcol) - 1;
- zfog[j] = fog[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 {
- 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];
+ else if (format == GL_RGB) {
+ 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;
+ }
}
- 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];
- }
+ 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;
+ }
}
}
-
- /* write the span */
- for (r=r0; r<r1; r++) {
- _mesa_write_rgba_span( ctx, m, x+skipcol, r, zdepth,
- (fog ? zfog : 0),
- zrgba, GL_BITMAP );
- }
-}
-
-
-
-void
-_mesa_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;
+ else if (format == GL_COLOR_INDEX) {
+ 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];
+ }
+ }
}
- 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];
+ /* 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.
+ */
+ const GLint end = zoomed.end; /* save */
+ if (r1 - r0 > 1) {
+ MEMCPY(rgbaSave, zoomed.array->rgba, zoomed.end * 4 * sizeof(GLchan));
}
- if (fog && ctx->Fog.Enabled) {
- for (j=0;j<m;j++) {
- i = n - (j+skipcol) - 1;
- zfog[j] = fog[i];
- }
+ 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 {
- 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];
+ else if (format == GL_COLOR_INDEX) {
+ const GLint end = zoomed.end; /* save */
+ if (r1 - r0 > 1) {
+ MEMCPY(indexSave, zoomed.array->index, zoomed.end * sizeof(GLuint));
}
- 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];
- }
+ 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));
+ }
}
}
-
- /* write the span */
- for (r=r0; r<r1; r++) {
- _mesa_write_rgba_span( ctx, m, x+skipcol, r, zdepth,
- (fog ? zfog : 0), zrgba, GL_BITMAP );
- }
}
-
-/*
- * As above, but write CI pixels.
- */
void
-_mesa_write_zoomed_index_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y, const GLdepth z[],
- const GLfixed *fog,
- const GLuint indexes[], GLint y0 )
+_swrast_write_zoomed_rgba_span( GLcontext *ctx, const struct sw_span *span,
+ CONST GLchan rgba[][4], GLint y0,
+ GLint skipPixels )
{
- 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;
- }
+ zoom_span(ctx, span, (const GLvoid *) rgba, y0, GL_RGBA, skipPixels);
+}
- /* 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 );
+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);
+}
- /* 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++) {
- _mesa_write_index_span( ctx, m, x+skipcol, r, zdepth,
- (fog ? zfog : 0), zindexes, GL_BITMAP );
- }
+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);
}
-
/*
* As above, but write stencil values.
*/
void
-_mesa_write_zoomed_stencil_span( GLcontext *ctx,
+_swrast_write_zoomed_stencil_span( GLcontext *ctx,
GLuint n, GLint x, GLint y,
- const GLstencil stencil[], GLint y0 )
+ const GLstencil stencil[], GLint y0,
+ GLint skipPixels )
{
GLint m;
GLint r0, r1, row, r;
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) ABSF( n * ctx->Pixel.ZoomX );
+ m = (GLint) FABSF( n * ctx->Pixel.ZoomX );
if (m==0) {
return;
}
}
/* compute which rows to draw */
- row = y-y0;
+ row = y - y0;
r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
if (r0==r1) {
/* below window */
return;
}
- if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+ if (r0 >= (GLint) ctx->DrawBuffer->Height &&
+ r1 >= (GLint) ctx->DrawBuffer->Height) {
/* above window */
return;
}
return;
}
- assert( m <= MAX_WIDTH );
+ ASSERT( m <= MAX_WIDTH );
/* zoom the span horizontally */
if (ctx->Pixel.ZoomX==-1.0F) {
/* write the span */
for (r=r0; r<r1; r++) {
- _mesa_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
+ _swrast_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
}
}
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