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copypix.c
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2000-01-07
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/* $Id: copypix.c,v 1.4.2.2 1999/12/03 18:25:25 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.1
*
* Copyright (C) 1999 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.
*/
#ifdef PC_HEADER
#include "all.h"
#else
#ifndef XFree86Server
#include <string.h>
#else
#include "GL/xf86glx.h"
#endif
#include "context.h"
#include "copypix.h"
#include "depth.h"
#include "feedback.h"
#include "macros.h"
#include "mmath.h"
#include "pixel.h"
#include "span.h"
#include "stencil.h"
#include "types.h"
#include "zoom.h"
#endif
/*
* Determine if there's overlap in an image copy
*/
static GLboolean
regions_overlap(int srcx, int srcy, int dstx, int dsty, int width, int height,
float zoomX, float zoomY)
{
if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
return GL_FALSE;
}
else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
return GL_FALSE;
}
else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
return GL_FALSE;
}
else {
return GL_TRUE;
}
}
static void copy_rgba_pixels( GLcontext* ctx,
GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
GLdepth zspan[MAX_WIDTH];
GLubyte rgba[MAX_WIDTH][4];
GLubyte *prgba,*p;
GLboolean quick_draw;
GLint sy, dy, stepy;
GLint i, j;
GLboolean changeBuffer;
GLubyte *saveAlpha;
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F;
GLboolean needbuffer;
/* Determine if copy should be done bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
needbuffer = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
if (ctx->Depth.Test || ctx->Fog.Enabled) {
/* fill in array of z values */
GLint z = (GLint) (ctx->Current.RasterPos[2] * DEPTH_SCALE);
for (i=0;i<width;i++) {
zspan[i] = z;
}
}
if (ctx->RasterMask==0 && !zoom
&& destx>=0 && destx+width<=ctx->Buffer->Width) {
quick_draw = GL_TRUE;
}
else {
quick_draw = GL_FALSE;
}
/* If read and draw buffer are different we must do buffer switching */
saveAlpha = ctx->Buffer->Alpha;
changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer;
if (needbuffer) {
GLint ssy = sy;
prgba = (GLubyte *) MALLOC(width*height*sizeof(GLubyte)*4);
if (!prgba) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = prgba;
if (changeBuffer) {
(*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
ctx->Buffer->Alpha = ctx->Buffer->FrontLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
ctx->Buffer->Alpha = ctx->Buffer->BackLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
ctx->Buffer->Alpha = ctx->Buffer->FrontRightAlpha;
else
ctx->Buffer->Alpha = ctx->Buffer->BackRightAlpha;
}
for (j=0; j<height; j++, ssy+=stepy) {
gl_read_rgba_span( ctx, width, srcx, ssy,(GLubyte (*)[4]) p );
p += (width*sizeof(GLubyte)*4);
}
p = prgba;
}
for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
if (needbuffer) {
MEMCPY(rgba, p, width * sizeof(GLubyte) * 4);
p += (width * sizeof(GLubyte) * 4);
}
else {
if (changeBuffer) {
(*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
ctx->Buffer->Alpha = ctx->Buffer->FrontLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
ctx->Buffer->Alpha = ctx->Buffer->BackLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
ctx->Buffer->Alpha = ctx->Buffer->FrontRightAlpha;
else
ctx->Buffer->Alpha = ctx->Buffer->BackRightAlpha;
}
gl_read_rgba_span( ctx, width, srcx, sy, rgba );
}
if (ctx->Pixel.ScaleOrBiasRGBA) {
gl_scale_and_bias_rgba( ctx, width, rgba );
}
if (ctx->Pixel.MapColorFlag) {
gl_map_rgba( ctx, width, rgba );
}
if (quick_draw && dy>=0 && dy<ctx->Buffer->Height) {
(*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
(const GLubyte (*)[4])rgba, NULL );
}
else if (zoom) {
gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan,
(const GLubyte (*)[4])rgba, desty);
}
else {
gl_write_rgba_span( ctx, width, destx, dy, zspan, rgba, GL_BITMAP );
}
}
if (needbuffer)
FREE(prgba);
/* Restore current alpha buffer pointer */
ctx->Buffer->Alpha = saveAlpha;
if (changeBuffer)
(*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
}
static void copy_ci_pixels( GLcontext* ctx,
GLint srcx, GLint srcy, GLint width, GLint height,
GLint destx, GLint desty )
{
GLdepth zspan[MAX_WIDTH];
GLuint *pci,*p;
GLint sy, dy, stepy;
GLint i, j;
GLboolean changeBuffer;
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F;
const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
GLboolean needbuffer;
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
needbuffer = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
if (ctx->Depth.Test || ctx->Fog.Enabled) {
/* fill in array of z values */
GLint z = (GLint) (ctx->Current.RasterPos[2] * DEPTH_SCALE);
for (i=0;i<width;i++) {
zspan[i] = z;
}
}
/* If read and draw buffer are different we must do buffer switching */
changeBuffer = ctx->Pixel.ReadBuffer!=ctx->Color.DrawBuffer;
if (needbuffer) {
GLint ssy = sy;
pci = (GLuint *) MALLOC(width * height * sizeof(GLuint));
if (!pci) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = pci;
if (changeBuffer) {
(*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
}
for (j=0; j<height; j++, ssy+=stepy) {
gl_read_index_span( ctx, width, srcx, ssy, p );
p += width;
}
p = pci;
}
for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
GLuint indexes[MAX_WIDTH];
if (needbuffer) {
MEMCPY(indexes, p, width * sizeof(GLuint));
p += width;
}
else {
if (changeBuffer) {
(*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
}
gl_read_index_span( ctx, width, srcx, sy, indexes );
}
if (shift_or_offset) {
gl_shift_and_offset_ci( ctx, width, indexes );
}
if (ctx->Pixel.MapColorFlag) {
gl_map_ci( ctx, width, indexes );
}
if (changeBuffer) {
(*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
}
if (zoom) {
gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, indexes, desty );
}
else {
gl_write_index_span( ctx, width, destx, dy, zspan, indexes, GL_BITMAP );
}
}
if (needbuffer)
FREE(pci);
if (changeBuffer)
(*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
}
/*
* TODO: Optimize!!!!
*/
static void copy_depth_pixels( GLcontext* ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
GLfloat depth[MAX_WIDTH];
GLdepth zspan[MAX_WIDTH];
GLfloat *p,*pdepth;
GLuint indexes[MAX_WIDTH];
GLubyte rgba[MAX_WIDTH][4];
GLint sy, dy, stepy;
GLint i, j;
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F;
GLboolean needbuffer;
if (!ctx->Buffer->Depth) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
return;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
needbuffer = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
/* setup colors or indexes */
if (ctx->Visual->RGBAflag) {
GLuint *rgba32 = (GLuint *) rgba;
GLuint color = *(GLuint*)( ctx->Current.ByteColor );
for (i=0; i<width; i++) {
rgba32[i] = color;
}
}
else {
for (i=0;i<width;i++) {
indexes[i] = ctx->Current.Index;
}
}
if (needbuffer) {
GLint ssy = sy;
pdepth = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
if (!pdepth) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = pdepth;
for (j=0; j<height; j++, ssy+=stepy) {
(*ctx->Driver.ReadDepthSpanFloat)( ctx, width, srcx, ssy, p );
p += width;
}
p = pdepth;
}
for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
if (needbuffer) {
MEMCPY(depth, p, width * sizeof(GLfloat));
p += width;
}
else {
(*ctx->Driver.ReadDepthSpanFloat)( ctx, width, srcx, sy, depth );
}
for (i=0;i<width;i++) {
GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
zspan[i] = (GLint) (CLAMP( d, 0.0F, 1.0F ) * DEPTH_SCALE);
}
if (ctx->Visual->RGBAflag) {
if (zoom) {
gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan,
(const GLubyte (*)[4])rgba, desty );
}
else {
gl_write_rgba_span( ctx, width, destx, dy, zspan, rgba, GL_BITMAP);
}
}
else {
if (zoom) {
gl_write_zoomed_index_span( ctx, width, destx, dy,
zspan, indexes, desty );
}
else {
gl_write_index_span( ctx, width, destx, dy,
zspan, indexes, GL_BITMAP );
}
}
}
if (needbuffer)
FREE(pdepth);
}
static void copy_stencil_pixels( GLcontext* ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
GLint sy, dy, stepy;
GLint j;
GLstencil *p,*psten;
const GLboolean zoom = (ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F);
const GLboolean shift_or_offset = ctx->Pixel.IndexShift!=0 || ctx->Pixel.IndexOffset!=0;
GLboolean needbuffer;
if (!ctx->Buffer->Stencil) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
return;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
needbuffer = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
if (needbuffer) {
GLint ssy = sy;
psten = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
if (!psten) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = psten;
for (j=0; j<height; j++, ssy+=stepy) {
gl_read_stencil_span( ctx, width, srcx, ssy, p );
p += width;
}
p = psten;
}
for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
GLstencil stencil[MAX_WIDTH];
if (needbuffer) {
MEMCPY(stencil, p, width * sizeof(GLstencil));
p += width;
}
else {
gl_read_stencil_span( ctx, width, srcx, sy, stencil );
}
if (shift_or_offset) {
gl_shift_and_offset_stencil( ctx, width, stencil );
}
if (ctx->Pixel.MapStencilFlag) {
gl_map_stencil( ctx, width, stencil );
}
if (zoom) {
gl_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
}
else {
gl_write_stencil_span( ctx, width, destx, dy, stencil );
}
}
if (needbuffer)
FREE(psten);
}
void gl_CopyPixels( GLcontext* ctx, GLint srcx, GLint srcy,
GLsizei width, GLsizei height, GLenum type )
{
GLint destx, desty;
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glCopyPixels");
if (width<0 || height<0) {
gl_error( ctx, GL_INVALID_VALUE, "glCopyPixels" );
return;
}
if (ctx->NewState) {
gl_update_state(ctx);
}
if (ctx->RenderMode==GL_RENDER) {
/* Destination of copy: */
if (!ctx->Current.RasterPosValid) {
return;
}
destx = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
desty = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
if (type==GL_COLOR && ctx->Visual->RGBAflag) {
copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else if (type==GL_COLOR && !ctx->Visual->RGBAflag) {
copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else if (type==GL_DEPTH) {
copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else if (type==GL_STENCIL) {
copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else {
gl_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
}
}
else if (ctx->RenderMode==GL_FEEDBACK) {
GLfloat color[4];
UBYTE_RGBA_TO_FLOAT_RGBA(color, ctx->Current.ByteColor );
FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
gl_feedback_vertex( ctx, ctx->Current.RasterPos,
color, ctx->Current.Index,
ctx->Current.Texcoord[0] );
}
else if (ctx->RenderMode==GL_SELECT) {
gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
}
}