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mapresample.c
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mapresample.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Assorted code related to resampling rasters.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1996-2005 Regents of the University of Minnesota.
*
* 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 of this Software or works derived from this 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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 <assert.h>
#include "mapresample.h"
#include "mapthread.h"
#ifndef MAX
# define MIN(a,b) ((a<b) ? a : b)
# define MAX(a,b) ((a>b) ? a : b)
#endif
#define SKIP_MASK(x,y) (mask_rb && !*(mask_rb->data.rgba.a+(y)*mask_rb->data.rgba.row_step+(x)*mask_rb->data.rgba.pixel_step))
/************************************************************************/
/* InvGeoTransform() */
/* */
/* Invert a standard 3x2 "GeoTransform" style matrix with an */
/* implicit [1 0 0] final row. */
/************************************************************************/
int InvGeoTransform( double *gt_in, double *gt_out )
{
double det, inv_det;
/* we assume a 3rd row that is [1 0 0] */
/* Compute determinate */
det = gt_in[1] * gt_in[5] - gt_in[2] * gt_in[4];
if( fabs(det) < 0.000000000000001 )
return 0;
inv_det = 1.0 / det;
/* compute adjoint, and devide by determinate */
gt_out[1] = gt_in[5] * inv_det;
gt_out[4] = -gt_in[4] * inv_det;
gt_out[2] = -gt_in[2] * inv_det;
gt_out[5] = gt_in[1] * inv_det;
gt_out[0] = ( gt_in[2] * gt_in[3] - gt_in[0] * gt_in[5]) * inv_det;
gt_out[3] = (-gt_in[1] * gt_in[3] + gt_in[0] * gt_in[4]) * inv_det;
return 1;
}
#if defined(USE_PROJ) && defined(USE_GDAL)
/************************************************************************/
/* msNearestRasterResample() */
/************************************************************************/
static int
msNearestRasterResampler( imageObj *psSrcImage, rasterBufferObj *src_rb,
imageObj *psDstImage, rasterBufferObj *dst_rb,
int *panCMap,
SimpleTransformer pfnTransform, void *pCBData,
int debug, rasterBufferObj *mask_rb )
{
double *x, *y;
int nDstX, nDstY;
int *panSuccess;
int nDstXSize = psDstImage->width;
int nDstYSize = psDstImage->height;
int nSrcXSize = psSrcImage->width;
int nSrcYSize = psSrcImage->height;
int nFailedPoints = 0, nSetPoints = 0;
assert(!MS_RENDERER_PLUGIN(psSrcImage->format) || src_rb->type == MS_BUFFER_BYTE_RGBA);
x = (double *) msSmallMalloc( sizeof(double) * nDstXSize );
y = (double *) msSmallMalloc( sizeof(double) * nDstXSize );
panSuccess = (int *) msSmallMalloc( sizeof(int) * nDstXSize );
for( nDstY = 0; nDstY < nDstYSize; nDstY++ ) {
for( nDstX = 0; nDstX < nDstXSize; nDstX++ ) {
x[nDstX] = nDstX + 0.5;
y[nDstX] = nDstY + 0.5;
}
pfnTransform( pCBData, nDstXSize, x, y, panSuccess );
for( nDstX = 0; nDstX < nDstXSize; nDstX++ ) {
int nSrcX, nSrcY;
if(SKIP_MASK(nDstX,nDstY))
continue;
if( !panSuccess[nDstX] ) {
nFailedPoints++;
continue;
}
nSrcX = (int) x[nDstX];
nSrcY = (int) y[nDstX];
/*
* We test the original floating point values to
* avoid errors related to asymmetric rounding around zero.
* (Also note bug #3120 regarding nearly redundent x/y < 0 checks).
*/
if( x[nDstX] < 0.0 || y[nDstX] < 0.0
|| nSrcX < 0 || nSrcY < 0
|| nSrcX >= nSrcXSize || nSrcY >= nSrcYSize ) {
continue;
}
if( MS_RENDERER_PLUGIN(psSrcImage->format) ) {
int src_rb_off;
rgbaArrayObj *src,*dst;
assert( src_rb->type == MS_BUFFER_BYTE_RGBA );
src = &src_rb->data.rgba;
dst = &dst_rb->data.rgba;
assert( src_rb && dst_rb );
src_rb_off = nSrcX * src->pixel_step
+ nSrcY * src->row_step;
if( src->a == NULL || src->a[src_rb_off] == 255 ) {
int dst_rb_off;
dst_rb_off = nDstX * dst->pixel_step
+ nDstY * dst->row_step;
nSetPoints++;
dst->r[dst_rb_off] = src->r[src_rb_off];
dst->g[dst_rb_off] = src->g[src_rb_off];
dst->b[dst_rb_off] = src->b[src_rb_off];
if( dst->a )
dst->a[dst_rb_off] = 255;
} else if( src->a[src_rb_off] != 0 ) {
int dst_rb_off;
dst_rb_off = nDstX * dst->pixel_step
+ nDstY * dst->row_step;
nSetPoints++;
/* actual alpha blending is required */
msAlphaBlendPM( src->r[src_rb_off],
src->g[src_rb_off],
src->b[src_rb_off],
src->a[src_rb_off],
dst->r + dst_rb_off,
dst->g + dst_rb_off,
dst->b + dst_rb_off,
dst->a ? dst->a + dst_rb_off : NULL );
}
} else if( MS_RENDERER_RAWDATA(psSrcImage->format) ) {
int band, src_off, dst_off;
src_off = nSrcX + nSrcY * psSrcImage->width;
if( !MS_GET_BIT(psSrcImage->img_mask,src_off) )
continue;
nSetPoints++;
dst_off = nDstX + nDstY * psDstImage->width;
MS_SET_BIT(psDstImage->img_mask,dst_off);
for( band = 0; band < psSrcImage->format->bands; band++ ) {
if( psSrcImage->format->imagemode == MS_IMAGEMODE_INT16 ) {
psDstImage->img.raw_16bit[dst_off]
= psSrcImage->img.raw_16bit[src_off];
} else if( psSrcImage->format->imagemode
== MS_IMAGEMODE_FLOAT32) {
psDstImage->img.raw_float[dst_off]
= psSrcImage->img.raw_float[src_off];
} else if(psSrcImage->format->imagemode == MS_IMAGEMODE_BYTE) {
psDstImage->img.raw_byte[dst_off]
= psSrcImage->img.raw_byte[src_off];
} else {
assert( 0 );
}
src_off += psSrcImage->width * psSrcImage->height;
dst_off += psDstImage->width * psDstImage->height;
}
}
}
}
free( panSuccess );
free( x );
free( y );
msFree(mask_rb);
/* -------------------------------------------------------------------- */
/* Some debugging output. */
/* -------------------------------------------------------------------- */
if( nFailedPoints > 0 && debug ) {
msDebug( "msNearestRasterResampler: "
"%d failed to transform, %d actually set.\n",
nFailedPoints, nSetPoints );
}
return 0;
}
/************************************************************************/
/* msSourceSample() */
/************************************************************************/
static void msSourceSample( imageObj *psSrcImage, rasterBufferObj *rb,
int iSrcX, int iSrcY, double *padfPixelSum,
double dfWeight, double *pdfWeightSum )
{
if( MS_RENDERER_PLUGIN(psSrcImage->format) ) {
rgbaArrayObj *rgba;
int rb_off;
assert(rb && rb->type == MS_BUFFER_BYTE_RGBA);
rgba = &(rb->data.rgba);
rb_off = iSrcX * rgba->pixel_step + iSrcY * rgba->row_step;
if( rgba->a == NULL || rgba->a[rb_off] > 1 ) {
padfPixelSum[0] += rgba->r[rb_off] * dfWeight;
padfPixelSum[1] += rgba->g[rb_off] * dfWeight;
padfPixelSum[2] += rgba->b[rb_off] * dfWeight;
if( rgba->a == NULL )
*pdfWeightSum += dfWeight;
else
*pdfWeightSum += dfWeight * (rgba->a[rb_off] / 255.0);
}
} else if( MS_RENDERER_RAWDATA(psSrcImage->format) ) {
int band;
int src_off;
src_off = iSrcX + iSrcY * psSrcImage->width;
if( !MS_GET_BIT(psSrcImage->img_mask,src_off) )
return;
for( band = 0; band < psSrcImage->format->bands; band++ ) {
if( psSrcImage->format->imagemode == MS_IMAGEMODE_INT16 ) {
int nValue;
nValue = psSrcImage->img.raw_16bit[src_off];
padfPixelSum[band] += dfWeight * nValue;
} else if( psSrcImage->format->imagemode
== MS_IMAGEMODE_FLOAT32) {
float fValue;
fValue = psSrcImage->img.raw_float[src_off];
padfPixelSum[band] += fValue * dfWeight;
} else if(psSrcImage->format->imagemode == MS_IMAGEMODE_BYTE) {
int nValue;
nValue = psSrcImage->img.raw_byte[src_off];
padfPixelSum[band] += nValue * dfWeight;
} else {
assert( 0 );
return;
}
src_off += psSrcImage->width * psSrcImage->height;
}
*pdfWeightSum += dfWeight;
}
}
/************************************************************************/
/* msBilinearRasterResample() */
/************************************************************************/
static int
msBilinearRasterResampler( imageObj *psSrcImage, rasterBufferObj *src_rb,
imageObj *psDstImage, rasterBufferObj *dst_rb,
int *panCMap,
SimpleTransformer pfnTransform, void *pCBData,
int debug, rasterBufferObj *mask_rb )
{
double *x, *y;
int nDstX, nDstY, i;
int *panSuccess;
int nDstXSize = psDstImage->width;
int nDstYSize = psDstImage->height;
int nSrcXSize = psSrcImage->width;
int nSrcYSize = psSrcImage->height;
int nFailedPoints = 0, nSetPoints = 0;
double *padfPixelSum;
int bandCount = MAX(4,psSrcImage->format->bands);
padfPixelSum = (double *) msSmallMalloc(sizeof(double) * bandCount);
x = (double *) msSmallMalloc( sizeof(double) * nDstXSize );
y = (double *) msSmallMalloc( sizeof(double) * nDstXSize );
panSuccess = (int *) msSmallMalloc( sizeof(int) * nDstXSize );
for( nDstY = 0; nDstY < nDstYSize; nDstY++ ) {
for( nDstX = 0; nDstX < nDstXSize; nDstX++ ) {
x[nDstX] = nDstX + 0.5;
y[nDstX] = nDstY + 0.5;
}
pfnTransform( pCBData, nDstXSize, x, y, panSuccess );
for( nDstX = 0; nDstX < nDstXSize; nDstX++ ) {
int nSrcX, nSrcY, nSrcX2, nSrcY2;
double dfRatioX2, dfRatioY2, dfWeightSum = 0.0;
if(SKIP_MASK(nDstX,nDstY)) continue;
if( !panSuccess[nDstX] ) {
nFailedPoints++;
continue;
}
/*
** Offset to treat TL pixel corners as pixel location instead
** of the center.
*/
x[nDstX] -= 0.5;
y[nDstX] -= 0.5;
nSrcX = (int) floor(x[nDstX]);
nSrcY = (int) floor(y[nDstX]);
nSrcX2 = nSrcX+1;
nSrcY2 = nSrcY+1;
dfRatioX2 = x[nDstX] - nSrcX;
dfRatioY2 = y[nDstX] - nSrcY;
/* If we are right off the source, skip this pixel */
if( nSrcX2 < 0 || nSrcX >= nSrcXSize
|| nSrcY2 < 0 || nSrcY >= nSrcYSize )
continue;
/* Trim in stuff one pixel off the edge */
nSrcX = MAX(nSrcX,0);
nSrcY = MAX(nSrcY,0);
nSrcX2 = MIN(nSrcX2,nSrcXSize-1);
nSrcY2 = MIN(nSrcY2,nSrcYSize-1);
memset( padfPixelSum, 0, sizeof(double) * bandCount);
msSourceSample( psSrcImage, src_rb, nSrcX, nSrcY, padfPixelSum,
(1.0 - dfRatioX2) * (1.0 - dfRatioY2),
&dfWeightSum );
msSourceSample( psSrcImage, src_rb, nSrcX2, nSrcY, padfPixelSum,
(dfRatioX2) * (1.0 - dfRatioY2),
&dfWeightSum );
msSourceSample( psSrcImage, src_rb, nSrcX, nSrcY2, padfPixelSum,
(1.0 - dfRatioX2) * (dfRatioY2),
&dfWeightSum );
msSourceSample( psSrcImage, src_rb, nSrcX2, nSrcY2, padfPixelSum,
(dfRatioX2) * (dfRatioY2),
&dfWeightSum );
if( dfWeightSum == 0.0 )
continue;
for( i = 0; i < bandCount; i++ )
padfPixelSum[i] /= dfWeightSum;
if( MS_RENDERER_PLUGIN(psSrcImage->format) ) {
assert(src_rb && dst_rb);
assert( src_rb->type == MS_BUFFER_BYTE_RGBA );
assert( src_rb->type == dst_rb->type );
nSetPoints++;
if( dfWeightSum > 0.001 ) {
int dst_rb_off = nDstX * dst_rb->data.rgba.pixel_step + nDstY * dst_rb->data.rgba.row_step;
unsigned char red, green, blue, alpha;
red = (unsigned char) MAX(0,MIN(255,padfPixelSum[0]));
green = (unsigned char) MAX(0,MIN(255,padfPixelSum[1]));
blue = (unsigned char) MAX(0,MIN(255,padfPixelSum[2]));
alpha = (unsigned char)MAX(0,MIN(255,255.5*dfWeightSum));
msAlphaBlendPM( red, green, blue, alpha,
dst_rb->data.rgba.r + dst_rb_off,
dst_rb->data.rgba.g + dst_rb_off,
dst_rb->data.rgba.b + dst_rb_off,
(dst_rb->data.rgba.a == NULL) ? NULL : dst_rb->data.rgba.a + dst_rb_off );
}
} else if( MS_RENDERER_RAWDATA(psSrcImage->format) ) {
int band;
int dst_off = nDstX + nDstY * psDstImage->width;
MS_SET_BIT(psDstImage->img_mask,dst_off);
for( band = 0; band < psSrcImage->format->bands; band++ ) {
if( psSrcImage->format->imagemode == MS_IMAGEMODE_INT16 ) {
psDstImage->img.raw_16bit[dst_off]
= (short) padfPixelSum[band];
} else if( psSrcImage->format->imagemode == MS_IMAGEMODE_FLOAT32) {
psDstImage->img.raw_float[dst_off]
= (float) padfPixelSum[band];
} else if( psSrcImage->format->imagemode == MS_IMAGEMODE_BYTE ) {
psDstImage->img.raw_byte[dst_off]
= (unsigned char)MAX(0,MIN(255,padfPixelSum[band]));
}
dst_off += psDstImage->width*psDstImage->height;
}
}
}
}
free( padfPixelSum );
free( panSuccess );
free( x );
free( y );
msFree(mask_rb);
/* -------------------------------------------------------------------- */
/* Some debugging output. */
/* -------------------------------------------------------------------- */
if( nFailedPoints > 0 && debug )
{
msDebug( "msBilinearRasterResampler: "
"%d failed to transform, %d actually set.\n",
nFailedPoints, nSetPoints );
}
return 0;
}
/************************************************************************/
/* msAverageSample() */
/************************************************************************/
static int
msAverageSample( imageObj *psSrcImage, rasterBufferObj *src_rb,
double dfXMin, double dfYMin, double dfXMax, double dfYMax,
double *padfPixelSum,
double *pdfAlpha01 )
{
int nXMin, nXMax, nYMin, nYMax, iX, iY;
double dfWeightSum = 0.0;
double dfMaxWeight = 0.0;
nXMin = (int) dfXMin;
nYMin = (int) dfYMin;
nXMax = (int) ceil(dfXMax);
nYMax = (int) ceil(dfYMax);
*pdfAlpha01 = 0.0;
for( iY = nYMin; iY < nYMax; iY++ ) {
double dfYCellMin, dfYCellMax;
dfYCellMin = MAX(iY,dfYMin);
dfYCellMax = MIN(iY+1,dfYMax);
for( iX = nXMin; iX < nXMax; iX++ ) {
double dfXCellMin, dfXCellMax, dfWeight;
dfXCellMin = MAX(iX,dfXMin);
dfXCellMax = MIN(iX+1,dfXMax);
dfWeight = (dfXCellMax-dfXCellMin) * (dfYCellMax-dfYCellMin);
msSourceSample( psSrcImage, src_rb, iX, iY, padfPixelSum,
dfWeight, &dfWeightSum );
dfMaxWeight += dfWeight;
}
}
if( dfWeightSum == 0.0 )
return MS_FALSE;
for( iX = 0; iX < 4; iX++ )
padfPixelSum[iX] /= dfWeightSum;
*pdfAlpha01 = dfWeightSum / dfMaxWeight;
return MS_TRUE;
}
/************************************************************************/
/* msAverageRasterResample() */
/************************************************************************/
static int
msAverageRasterResampler( imageObj *psSrcImage, rasterBufferObj *src_rb,
imageObj *psDstImage, rasterBufferObj *dst_rb,
int *panCMap,
SimpleTransformer pfnTransform, void *pCBData,
int debug, rasterBufferObj *mask_rb )
{
double *x1, *y1, *x2, *y2;
int nDstX, nDstY;
int *panSuccess1, *panSuccess2;
int nDstXSize = psDstImage->width;
int nDstYSize = psDstImage->height;
int nFailedPoints = 0, nSetPoints = 0;
double *padfPixelSum;
int bandCount = MAX(4,psSrcImage->format->bands);
padfPixelSum = (double *) msSmallMalloc(sizeof(double) * bandCount);
x1 = (double *) msSmallMalloc( sizeof(double) * (nDstXSize+1) );
y1 = (double *) msSmallMalloc( sizeof(double) * (nDstXSize+1) );
x2 = (double *) msSmallMalloc( sizeof(double) * (nDstXSize+1) );
y2 = (double *) msSmallMalloc( sizeof(double) * (nDstXSize+1) );
panSuccess1 = (int *) msSmallMalloc( sizeof(int) * (nDstXSize+1) );
panSuccess2 = (int *) msSmallMalloc( sizeof(int) * (nDstXSize+1) );
for( nDstY = 0; nDstY < nDstYSize; nDstY++ ) {
for( nDstX = 0; nDstX <= nDstXSize; nDstX++ ) {
x1[nDstX] = nDstX;
y1[nDstX] = nDstY;
x2[nDstX] = nDstX;
y2[nDstX] = nDstY+1;
}
pfnTransform( pCBData, nDstXSize+1, x1, y1, panSuccess1 );
pfnTransform( pCBData, nDstXSize+1, x2, y2, panSuccess2 );
for( nDstX = 0; nDstX < nDstXSize; nDstX++ ) {
double dfXMin, dfYMin, dfXMax, dfYMax;
double dfAlpha01;
if(SKIP_MASK(nDstX,nDstY)) continue;
/* Do not generate a pixel unless all four corners transformed */
if( !panSuccess1[nDstX] || !panSuccess1[nDstX+1]
|| !panSuccess2[nDstX] || !panSuccess2[nDstX+1] ) {
nFailedPoints++;
continue;
}
dfXMin = MIN(MIN(x1[nDstX],x1[nDstX+1]),
MIN(x2[nDstX],x2[nDstX+1]));
dfYMin = MIN(MIN(y1[nDstX],y1[nDstX+1]),
MIN(y2[nDstX],y2[nDstX+1]));
dfXMax = MAX(MAX(x1[nDstX],x1[nDstX+1]),
MAX(x2[nDstX],x2[nDstX+1]));
dfYMax = MAX(MAX(y1[nDstX],y1[nDstX+1]),
MAX(y2[nDstX],y2[nDstX+1]));
dfXMin = MIN(MAX(dfXMin,0),psSrcImage->width+1);
dfYMin = MIN(MAX(dfYMin,0),psSrcImage->height+1);
dfXMax = MIN(MAX(-1,dfXMax),psSrcImage->width);
dfYMax = MIN(MAX(-1,dfYMax),psSrcImage->height);
memset( padfPixelSum, 0, sizeof(double)*bandCount );
if( !msAverageSample( psSrcImage, src_rb,
dfXMin, dfYMin, dfXMax, dfYMax,
padfPixelSum, &dfAlpha01 ) )
continue;
if( MS_RENDERER_PLUGIN(psSrcImage->format) ) {
assert(dst_rb && src_rb);
assert( dst_rb->type == MS_BUFFER_BYTE_RGBA );
assert( src_rb->type == dst_rb ->type );
nSetPoints++;
if( dfAlpha01 > 0 ) {
unsigned char red, green, blue, alpha;
red = (unsigned char)
MAX(0,MIN(255,padfPixelSum[0]+0.5));
green = (unsigned char)
MAX(0,MIN(255,padfPixelSum[1]+0.5));
blue = (unsigned char)
MAX(0,MIN(255,padfPixelSum[2]+0.5));
alpha = (unsigned char)
MAX(0,MIN(255,255*dfAlpha01+0.5));
RB_SET_PIXEL(dst_rb,nDstX,nDstY,
red, green, blue, alpha );
}
} else if( MS_RENDERER_RAWDATA(psSrcImage->format) ) {
int band;
int dst_off = nDstX + nDstY * psDstImage->width;
MS_SET_BIT(psDstImage->img_mask,dst_off);
for( band = 0; band < psSrcImage->format->bands; band++ ) {
if( psSrcImage->format->imagemode == MS_IMAGEMODE_INT16 ) {
psDstImage->img.raw_16bit[dst_off]
= (short) (padfPixelSum[band]+0.5);
} else if( psSrcImage->format->imagemode == MS_IMAGEMODE_FLOAT32) {
psDstImage->img.raw_float[dst_off]
= (float) padfPixelSum[band];
} else if( psSrcImage->format->imagemode == MS_IMAGEMODE_BYTE ) {
psDstImage->img.raw_byte[dst_off]
= (unsigned char) padfPixelSum[band];
}
dst_off += psDstImage->width * psDstImage->height;
}
}
}
}
free( padfPixelSum );
free( panSuccess1 );
free( x1 );
free( y1 );
free( panSuccess2 );
free( x2 );
free( y2 );
msFree(mask_rb);
/* -------------------------------------------------------------------- */
/* Some debugging output. */
/* -------------------------------------------------------------------- */
if( nFailedPoints > 0 && debug )
{
msDebug( "msAverageRasterResampler: "
"%d failed to transform, %d actually set.\n",
nFailedPoints, nSetPoints );
}
return 0;
}
/************************************************************************/
/* ==================================================================== */
/* PROJ.4 based transformer. */
/* ==================================================================== */
/************************************************************************/
typedef struct {
projectionObj *psSrcProjObj;
projPJ psSrcProj;
int bSrcIsGeographic;
double adfInvSrcGeoTransform[6];
projectionObj *psDstProjObj;
projPJ psDstProj;
int bDstIsGeographic;
double adfDstGeoTransform[6];
int bUseProj;
} msProjTransformInfo;
/************************************************************************/
/* msInitProjTransformer() */
/************************************************************************/
void *msInitProjTransformer( projectionObj *psSrc,
double *padfSrcGeoTransform,
projectionObj *psDst,
double *padfDstGeoTransform )
{
msProjTransformInfo *psPTInfo;
psPTInfo = (msProjTransformInfo *) msSmallCalloc(1,sizeof(msProjTransformInfo));
/* -------------------------------------------------------------------- */
/* We won't even use PROJ.4 if either coordinate system is */
/* NULL. */
/* -------------------------------------------------------------------- */
psPTInfo->bUseProj =
(psSrc->proj != NULL && psDst->proj != NULL
&& msProjectionsDiffer( psSrc, psDst ) );
/* -------------------------------------------------------------------- */
/* Record source image information. We invert the source */
/* transformation for more convenient inverse application in */
/* the transformer. */
/* -------------------------------------------------------------------- */
psPTInfo->psSrcProj = psSrc->proj;
if( psPTInfo->bUseProj )
psPTInfo->bSrcIsGeographic = pj_is_latlong(psSrc->proj);
else
psPTInfo->bSrcIsGeographic = MS_FALSE;
if( !InvGeoTransform(padfSrcGeoTransform,
psPTInfo->adfInvSrcGeoTransform) )
return NULL;
/* -------------------------------------------------------------------- */
/* Record destination image information. */
/* -------------------------------------------------------------------- */
psPTInfo->psDstProj = psDst->proj;
if( psPTInfo->bUseProj )
psPTInfo->bDstIsGeographic = pj_is_latlong(psDst->proj);
else
psPTInfo->bDstIsGeographic = MS_FALSE;
memcpy( psPTInfo->adfDstGeoTransform, padfDstGeoTransform,
sizeof(double) * 6 );
return psPTInfo;
}
/************************************************************************/
/* msFreeProjTransformer() */
/************************************************************************/
void msFreeProjTransformer( void * pCBData )
{
free( pCBData );
}
/************************************************************************/
/* msProjTransformer */
/************************************************************************/
int msProjTransformer( void *pCBData, int nPoints,
double *x, double *y, int *panSuccess )
{
int i;
msProjTransformInfo *psPTInfo = (msProjTransformInfo*) pCBData;
double x_out;
/* -------------------------------------------------------------------- */
/* Transform into destination georeferenced space. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nPoints; i++ ) {
x_out = psPTInfo->adfDstGeoTransform[0]
+ psPTInfo->adfDstGeoTransform[1] * x[i]
+ psPTInfo->adfDstGeoTransform[2] * y[i];
y[i] = psPTInfo->adfDstGeoTransform[3]
+ psPTInfo->adfDstGeoTransform[4] * x[i]
+ psPTInfo->adfDstGeoTransform[5] * y[i];
x[i] = x_out;
panSuccess[i] = 1;
}
/* -------------------------------------------------------------------- */
/* Transform from degrees to radians if geographic. */
/* -------------------------------------------------------------------- */
if( psPTInfo->bDstIsGeographic ) {
for( i = 0; i < nPoints; i++ ) {
x[i] = x[i] * DEG_TO_RAD;
y[i] = y[i] * DEG_TO_RAD;
}
}
/* -------------------------------------------------------------------- */
/* Transform back to source projection space. */
/* -------------------------------------------------------------------- */
if( psPTInfo->bUseProj ) {
double *z;
int tr_result;
z = (double *) msSmallCalloc(sizeof(double),nPoints);
msAcquireLock( TLOCK_PROJ );
tr_result = pj_transform( psPTInfo->psDstProj, psPTInfo->psSrcProj,
nPoints, 1, x, y, z);
msReleaseLock( TLOCK_PROJ );
if( tr_result != 0 ) {
free( z );
for( i = 0; i < nPoints; i++ )
panSuccess[i] = 0;
return MS_FALSE;
}
free( z );
for( i = 0; i < nPoints; i++ ) {
if( x[i] == HUGE_VAL || y[i] == HUGE_VAL )
panSuccess[i] = 0;
}
}
/* -------------------------------------------------------------------- */
/* Transform back to degrees if source is geographic. */
/* -------------------------------------------------------------------- */
if( psPTInfo->bSrcIsGeographic ) {
for( i = 0; i < nPoints; i++ ) {
if( panSuccess[i] ) {
x[i] = x[i] * RAD_TO_DEG;
y[i] = y[i] * RAD_TO_DEG;
}
}
}
/* -------------------------------------------------------------------- */
/* Transform to source raster space. */
/* -------------------------------------------------------------------- */
for( i = 0; i < nPoints; i++ ) {
if( panSuccess[i] ) {
x_out = psPTInfo->adfInvSrcGeoTransform[0]
+ psPTInfo->adfInvSrcGeoTransform[1] * x[i]
+ psPTInfo->adfInvSrcGeoTransform[2] * y[i];
y[i] = psPTInfo->adfInvSrcGeoTransform[3]
+ psPTInfo->adfInvSrcGeoTransform[4] * x[i]
+ psPTInfo->adfInvSrcGeoTransform[5] * y[i];
x[i] = x_out;
} else {
x[i] = -1;
y[i] = -1;
}
}
return 1;
}
/************************************************************************/
/* ==================================================================== */
/* Approximate transformer. */
/* ==================================================================== */
/************************************************************************/
typedef struct {
SimpleTransformer pfnBaseTransformer;
void *pBaseCBData;
double dfMaxError;
} msApproxTransformInfo;
/************************************************************************/
/* msInitApproxTransformer() */
/************************************************************************/
static void *msInitApproxTransformer( SimpleTransformer pfnBaseTransformer,
void *pBaseCBData,
double dfMaxError )
{
msApproxTransformInfo *psATInfo;
psATInfo = (msApproxTransformInfo *) msSmallMalloc(sizeof(msApproxTransformInfo));
psATInfo->pfnBaseTransformer = pfnBaseTransformer;
psATInfo->pBaseCBData = pBaseCBData;
psATInfo->dfMaxError = dfMaxError;
return psATInfo;
}
/************************************************************************/
/* msFreeApproxTransformer() */
/************************************************************************/
static void msFreeApproxTransformer( void * pCBData )
{
free( pCBData );
}
/************************************************************************/
/* msApproxTransformer */
/************************************************************************/
static int msApproxTransformer( void *pCBData, int nPoints,
double *x, double *y, int *panSuccess )
{
msApproxTransformInfo *psATInfo = (msApproxTransformInfo *) pCBData;
double x2[3], y2[3], dfDeltaX, dfDeltaY, dfError, dfDist;
int nMiddle, anSuccess2[3], i, bSuccess;
nMiddle = (nPoints-1)/2;
/* -------------------------------------------------------------------- */
/* Bail if our preconditions are not met, or if error is not */
/* acceptable. */
/* -------------------------------------------------------------------- */
if( y[0] != y[nPoints-1] || y[0] != y[nMiddle]
|| x[0] == x[nPoints-1] || x[0] == x[nMiddle]
|| psATInfo->dfMaxError == 0.0 || nPoints <= 5 ) {
return psATInfo->pfnBaseTransformer( psATInfo->pBaseCBData, nPoints,
x, y, panSuccess );
}
/* -------------------------------------------------------------------- */
/* Transform first, last and middle point. */
/* -------------------------------------------------------------------- */
x2[0] = x[0];
y2[0] = y[0];
x2[1] = x[nMiddle];
y2[1] = y[nMiddle];
x2[2] = x[nPoints-1];
y2[2] = y[nPoints-1];
bSuccess =
psATInfo->pfnBaseTransformer( psATInfo->pBaseCBData, 3, x2, y2,
anSuccess2 );
if( !bSuccess || !anSuccess2[0] || !anSuccess2[1] || !anSuccess2[2] )
return psATInfo->pfnBaseTransformer( psATInfo->pBaseCBData, nPoints,
x, y, panSuccess );
/* -------------------------------------------------------------------- */
/* Is the error at the middle acceptable relative to an */
/* interpolation of the middle position? */
/* -------------------------------------------------------------------- */
dfDeltaX = (x2[2] - x2[0]) / (x[nPoints-1] - x[0]);
dfDeltaY = (y2[2] - y2[0]) / (x[nPoints-1] - x[0]);
dfError = fabs((x2[0] + dfDeltaX * (x[nMiddle] - x[0])) - x2[1])
+ fabs((y2[0] + dfDeltaY * (x[nMiddle] - x[0])) - y2[1]);
if( dfError > psATInfo->dfMaxError ) {
bSuccess =
msApproxTransformer( psATInfo, nMiddle, x, y, panSuccess );
if( !bSuccess ) {
return psATInfo->pfnBaseTransformer( psATInfo->pBaseCBData,
nPoints,
x, y, panSuccess );
}
bSuccess =
msApproxTransformer( psATInfo, nPoints - nMiddle,
x+nMiddle, y+nMiddle, panSuccess+nMiddle );
if( !bSuccess ) {
return psATInfo->pfnBaseTransformer( psATInfo->pBaseCBData,
nPoints,
x, y, panSuccess );
}
return 1;
}
/* -------------------------------------------------------------------- */
/* Error is OK, linearly interpolate all points along line. */
/* -------------------------------------------------------------------- */
for( i = nPoints-1; i >= 0; i-- ) {
dfDist = (x[i] - x[0]);
y[i] = y2[0] + dfDeltaY * dfDist;
x[i] = x2[0] + dfDeltaX * dfDist;
panSuccess[i] = 1;
}
return 1;
}
/************************************************************************/
/* msTransformMapToSource() */
/* */
/* Compute the extents of the current map view if transformed */
/* onto the source raster. */
/************************************************************************/
static int msTransformMapToSource( int nDstXSize, int nDstYSize,
double * adfDstGeoTransform,
projectionObj *psDstProj,
int nSrcXSize, int nSrcYSize,
double * adfInvSrcGeoTransform,
projectionObj *psSrcProj,
rectObj *psSrcExtent,
int bUseGrid )
{
int nFailures = 0;
#define EDGE_STEPS 10
#define MAX_SIZE ((EDGE_STEPS+1)*(EDGE_STEPS+1))
int i, nSamples = 0, bOutInit = 0;
double dfRatio;
double x[MAX_SIZE], y[MAX_SIZE], z[MAX_SIZE];