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gdalwmsrasterband.cpp
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gdalwmsrasterband.cpp
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/******************************************************************************
*
* Project: WMS Client Driver
* Purpose: GDALWMSRasterBand implementation.
* Author: Adam Nowacki, nowak@xpam.de
*
******************************************************************************
* Copyright (c) 2007, Adam Nowacki
* Copyright (c) 2008-2013, Even Rouault <even dot rouault at spatialys.com>
* Copyright (c) 2017, Dmitry Baryshnikov, <polimax@mail.ru>
* Copyright (c) 2017, NextGIS, <info@nextgis.com>
*
* 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
* 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 "wmsdriver.h"
#include <algorithm>
GDALWMSRasterBand::GDALWMSRasterBand(GDALWMSDataset *parent_dataset, int band,
double scale):
m_parent_dataset(parent_dataset),
m_scale(scale),
m_overview(-1),
m_color_interp(GCI_Undefined),
m_nAdviseReadBX0(-1),
m_nAdviseReadBY0(-1),
m_nAdviseReadBX1(-1),
m_nAdviseReadBY1(-1)
{
#ifdef DEBUG_VERBOSE
printf("[%p] GDALWMSRasterBand::GDALWMSRasterBand(%p, %d, %f)\n",/*ok*/
this, parent_dataset, band, scale);
#endif
if( scale == 1.0 )
poDS = parent_dataset;
else
poDS = nullptr;
if( parent_dataset->m_mini_driver_caps.m_overview_dim_computation_method ==
OVERVIEW_ROUNDED )
{
nRasterXSize = static_cast<int>(
m_parent_dataset->m_data_window.m_sx * scale + 0.5);
nRasterYSize = static_cast<int>(
m_parent_dataset->m_data_window.m_sy * scale + 0.5);
}
else
{
nRasterXSize = static_cast<int>(
m_parent_dataset->m_data_window.m_sx * scale);
nRasterYSize = static_cast<int>(
m_parent_dataset->m_data_window.m_sy * scale);
}
nBand = band;
eDataType = m_parent_dataset->m_data_type;
nBlockXSize = m_parent_dataset->m_block_size_x;
nBlockYSize = m_parent_dataset->m_block_size_y;
}
GDALWMSRasterBand::~GDALWMSRasterBand() {
while (!m_overviews.empty()) {
delete m_overviews.back();
m_overviews.pop_back();
}
}
// Request for x, y but all blocks between bx0-bx1 and by0-by1 should be read
CPLErr GDALWMSRasterBand::ReadBlocks(int x, int y, void *buffer, int bx0, int by0, int bx1, int by1, int advise_read) {
CPLErr ret = CE_None;
// Get a vector of requests large enough for this call
std::vector<WMSHTTPRequest> requests((bx1 - bx0 + 1)*(by1 - by0 + 1));
size_t count = 0; // How many requests are valid
GDALWMSCache *cache = m_parent_dataset->m_cache;
int offline = m_parent_dataset->m_offline_mode;
const char *const *options = m_parent_dataset->GetHTTPRequestOpts();
for (int iy = by0; iy <= by1; ++iy) {
for (int ix = bx0; ix <= bx1; ++ix) {
WMSHTTPRequest &request = requests[count];
request.x = ix;
request.y = iy;
bool need_this_block = false;
if (!advise_read) {
for (int ib = 1; ib <= m_parent_dataset->nBands; ++ib) {
if ((ix == x) && (iy == y) && (ib == nBand)) {
need_this_block = true;
} else {
GDALWMSRasterBand *band = static_cast<GDALWMSRasterBand *>(m_parent_dataset->GetRasterBand(ib));
if (m_overview >= 0) band = static_cast<GDALWMSRasterBand *>(band->GetOverview(m_overview));
if (!band->IsBlockInCache(ix, iy)) need_this_block = true;
}
}
} else {
need_this_block = true;
}
void *p = ((ix == x) && (iy == y)) ? buffer : nullptr;
if (need_this_block) {
ret = AskMiniDriverForBlock(request, ix, iy);
if (ret != CE_None) {
CPLError(CE_Failure, CPLE_AppDefined, "%s", request.Error.c_str());
ret = CE_Failure;
}
// A missing tile is signaled by setting a range of "none"
if (EQUAL(request.Range, "none")) {
if (!advise_read) {
if (EmptyBlock(ix, iy, nBand, p) != CE_None) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: EmptyBlock failed.");
ret = CE_Failure;
}
}
need_this_block = false;
}
if (ret == CE_None && cache != nullptr)
{
if ( cache->GetItemStatus(request.URL) == CACHE_ITEM_OK )
{
if ( advise_read )
{
need_this_block = false;
}
else
{
if (ReadBlockFromCache( request.URL, ix, iy, nBand,
p, 0 ) == CE_None)
{
need_this_block = false;
}
}
}
}
}
if (need_this_block) {
if (offline) {
if (!advise_read) {
if (EmptyBlock(ix, iy, nBand, p) != CE_None) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: EmptyBlock failed.");
ret = CE_Failure;
}
}
} else {
request.options = options;
WMSHTTPInitializeRequest(&request);
count++;
}
}
}
}
// Fetch all the requests, OK to call with count of 0
if (WMSHTTPFetchMulti(count ? &requests[0] : nullptr, static_cast<int>(count)) != CE_None) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: CPLHTTPFetchMulti failed.");
ret = CE_Failure;
}
for (size_t i = 0; i < count; ++i) {
WMSHTTPRequest &request = requests[i];
void *p = ((request.x == x) && (request.y == y)) ? buffer : nullptr;
if (ret == CE_None) {
int success = (request.nStatus == 200) ||
(!request.Range.empty() && request.nStatus == 206);
if (success && (request.pabyData != nullptr) && (request.nDataLen > 0)) {
CPLString file_name(BufferToVSIFile(request.pabyData, request.nDataLen));
if (!file_name.empty()) {
/* check for error xml */
if (request.nDataLen >= 20) {
const char *download_data = reinterpret_cast<char *>(request.pabyData);
if (STARTS_WITH_CI(download_data, "<?xml ")
|| STARTS_WITH_CI(download_data, "<!DOCTYPE ")
|| STARTS_WITH_CI(download_data, "<ServiceException")) {
if (ReportWMSException(file_name) != CE_None) {
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: The server returned unknown exception.");
}
ret = CE_Failure;
}
}
if (ret == CE_None) {
if (advise_read && !m_parent_dataset->m_verify_advise_read) {
if (cache != nullptr)
cache->Insert(request.URL, file_name);
} else {
ret = ReadBlockFromFile(file_name, request.x,
request.y, nBand, p, advise_read);
if (ret == CE_None) {
if (cache != nullptr)
cache->Insert(request.URL, file_name);
} else {
CPLError(ret, CPLE_AppDefined,
"GDALWMS: ReadBlockFromFile (%s) failed.", request.URL.c_str());
}
}
}
else if (m_parent_dataset->m_zeroblock_on_serverexceptions) {
ret = EmptyBlock(request.x, request.y, nBand, p);
if (ret != CE_None)
CPLError(ret, CPLE_AppDefined, "GDALWMS: EmptyBlock failed.");
}
VSIUnlink(file_name);
}
} else { // HTTP error
// One more try to get cached block. For example if no web access
// available
CPLDebug("WMS", "ReadBlockFromCache");
if (m_parent_dataset->m_cache != nullptr)
ret = ReadBlockFromCache(request.URL, request.x,
request.y, nBand, p, advise_read);
else
ret = CE_Failure;
if( ret != CE_None )
{
CPLDebug("WMS", "After ReadBlockFromCache");
if (m_parent_dataset->m_http_zeroblock_codes.find(request.nStatus)
!= m_parent_dataset->m_http_zeroblock_codes.end())
{
if (!advise_read) {
ret = EmptyBlock(request.x, request.y, nBand, p);
if (ret != CE_None)
CPLError(ret, CPLE_AppDefined, "GDALWMS: EmptyBlock failed.");
}
} else {
ret = CE_Failure;
CPLError(ret, CPLE_AppDefined,
"GDALWMS: Unable to download block %d, %d.\n"
"URL: %s\n HTTP status code: %d, error: %s.\n"
"Add the HTTP status code to <ZeroBlockHttpCodes> to ignore this error (see http://www.gdal.org/frmt_wms.html).",
request.x,
request.y,
!request.URL.empty() ? request.Error.c_str(): "(null)",
request.nStatus,
!request.Error.empty() ? request.Error.c_str() : "(null)");
}
}
}
}
}
return ret;
}
CPLErr GDALWMSRasterBand::IReadBlock(int x, int y, void *buffer) {
int bx0 = x;
int by0 = y;
int bx1 = x;
int by1 = y;
bool bCancelHint = false;
if ((m_parent_dataset->m_hint.m_valid) && (m_parent_dataset->m_hint.m_overview == m_overview)) {
int tbx0 = m_parent_dataset->m_hint.m_x0 / nBlockXSize;
int tby0 = m_parent_dataset->m_hint.m_y0 / nBlockYSize;
int tbx1 = (m_parent_dataset->m_hint.m_x0 + m_parent_dataset->m_hint.m_sx - 1) / nBlockXSize;
int tby1 = (m_parent_dataset->m_hint.m_y0 + m_parent_dataset->m_hint.m_sy - 1) / nBlockYSize;
if ((tbx0 <= x) && (tby0 <= y) && (tbx1 >= x) && (tby1 >= y)) {
// Avoid downloading a insane number of tiles at once.
// Limit to 30x30 tiles centered around block of interest.
bx0 = std::max(x - 15, tbx0);
by0 = std::max(y - 15, tby0);
bx1 = std::min(x + 15, tbx1);
by1 = std::min(y + 15, tby1);
bCancelHint = (bx0 == tbx0 && by0 == tby0 && bx1 == tbx1 && by1 == tby1);
}
}
CPLErr eErr = ReadBlocks(x, y, buffer, bx0, by0, bx1, by1, 0);
if (bCancelHint)
{
m_parent_dataset->m_hint.m_valid = false;
}
return eErr;
}
CPLErr GDALWMSRasterBand::IRasterIO(GDALRWFlag rw, int x0, int y0, int sx, int sy,
void *buffer, int bsx, int bsy, GDALDataType bdt,
GSpacing nPixelSpace, GSpacing nLineSpace,
GDALRasterIOExtraArg* psExtraArg) {
CPLErr ret;
if (rw != GF_Read) return CE_Failure;
if (buffer == nullptr) return CE_Failure;
if ((sx == 0) || (sy == 0) || (bsx == 0) || (bsy == 0)) return CE_None;
m_parent_dataset->m_hint.m_x0 = x0;
m_parent_dataset->m_hint.m_y0 = y0;
m_parent_dataset->m_hint.m_sx = sx;
m_parent_dataset->m_hint.m_sy = sy;
m_parent_dataset->m_hint.m_overview = m_overview;
m_parent_dataset->m_hint.m_valid = true;
ret = GDALRasterBand::IRasterIO(rw, x0, y0, sx, sy, buffer, bsx, bsy, bdt, nPixelSpace, nLineSpace, psExtraArg);
m_parent_dataset->m_hint.m_valid = false;
return ret;
}
int GDALWMSRasterBand::HasArbitraryOverviews() {
// return m_parent_dataset->m_mini_driver_caps.m_has_arb_overviews;
return 0; // not implemented yet
}
int GDALWMSRasterBand::GetOverviewCount() {
return static_cast<int>(m_overviews.size());
}
GDALRasterBand *GDALWMSRasterBand::GetOverview(int n) {
if ((!m_overviews.empty()) && (static_cast<size_t>(n) < m_overviews.size())) return m_overviews[n];
else return nullptr;
}
bool GDALWMSRasterBand::AddOverview(double scale) {
GDALWMSRasterBand *overview = new GDALWMSRasterBand(m_parent_dataset, nBand, scale);
if( overview->GetXSize() == 0 || overview->GetYSize() == 0 )
{
delete overview;
return false;
}
std::vector<GDALWMSRasterBand *>::iterator it = m_overviews.begin();
for (; it != m_overviews.end(); ++it) {
GDALWMSRasterBand *p = *it;
if (p->m_scale < scale) break;
}
m_overviews.insert(it, overview);
it = m_overviews.begin();
for (int i = 0; it != m_overviews.end(); ++it, ++i) {
GDALWMSRasterBand *p = *it;
p->m_overview = i;
}
return true;
}
bool GDALWMSRasterBand::IsBlockInCache(int x, int y) {
bool ret = false;
GDALRasterBlock *b = TryGetLockedBlockRef(x, y);
if (b != nullptr) {
ret = true;
b->DropLock();
}
return ret;
}
// This is the function that calculates the block coordinates for the fetch
CPLErr GDALWMSRasterBand::AskMiniDriverForBlock(WMSHTTPRequest &r, int x, int y)
{
GDALWMSImageRequestInfo iri;
GDALWMSTiledImageRequestInfo tiri;
ComputeRequestInfo(iri, tiri, x, y);
return m_parent_dataset->m_mini_driver->TiledImageRequest(r, iri, tiri);
}
void GDALWMSRasterBand::ComputeRequestInfo(GDALWMSImageRequestInfo &iri,
GDALWMSTiledImageRequestInfo &tiri,
int x, int y)
{
int x0 = std::max(0, x * nBlockXSize);
int y0 = std::max(0, y * nBlockYSize);
int x1 = std::max(0, (x + 1) * nBlockXSize);
int y1 = std::max(0, (y + 1) * nBlockYSize);
if (m_parent_dataset->m_clamp_requests) {
x0 = std::min(x0, nRasterXSize);
y0 = std::min(y0, nRasterYSize);
x1 = std::min(x1, nRasterXSize);
y1 = std::min(y1, nRasterYSize);
}
const double rx = (m_parent_dataset->m_data_window.m_x1 - m_parent_dataset->m_data_window.m_x0) / static_cast<double>(nRasterXSize);
const double ry = (m_parent_dataset->m_data_window.m_y1 - m_parent_dataset->m_data_window.m_y0) / static_cast<double>(nRasterYSize);
/* Use different method for x0,y0 and x1,y1 to make sure calculated values are exact for corner requests */
iri.m_x0 = x0 * rx + m_parent_dataset->m_data_window.m_x0;
iri.m_y0 = y0 * ry + m_parent_dataset->m_data_window.m_y0;
iri.m_x1 = m_parent_dataset->m_data_window.m_x1 - (nRasterXSize - x1) * rx;
iri.m_y1 = m_parent_dataset->m_data_window.m_y1 - (nRasterYSize - y1) * ry;
iri.m_sx = x1 - x0;
iri.m_sy = y1 - y0;
int level = m_overview + 1;
tiri.m_x = (m_parent_dataset->m_data_window.m_tx >> level) + x;
tiri.m_y = (m_parent_dataset->m_data_window.m_ty >> level) + y;
tiri.m_level = m_parent_dataset->m_data_window.m_tlevel - level;
}
/************************************************************************/
/* GetMetadataDomainList() */
/************************************************************************/
char **GDALWMSRasterBand::GetMetadataDomainList()
{
char **m_list = GDALPamRasterBand::GetMetadataDomainList();
char **mini_list = m_parent_dataset->m_mini_driver->GetMetadataDomainList();
if (mini_list != nullptr) {
m_list = CSLMerge(m_list, mini_list);
CSLDestroy(mini_list);
}
return m_list;
}
const char *GDALWMSRasterBand::GetMetadataItem(const char * pszName,
const char * pszDomain)
{
if (!m_parent_dataset->m_mini_driver_caps.m_has_getinfo
|| !(pszDomain != nullptr
&& EQUAL(pszDomain, "LocationInfo")
&& (STARTS_WITH_CI(pszName, "Pixel_") || STARTS_WITH_CI(pszName, "GeoPixel_"))))
return GDALPamRasterBand::GetMetadataItem(pszName, pszDomain);
/* ==================================================================== */
/* LocationInfo handling. */
/* ==================================================================== */
/* -------------------------------------------------------------------- */
/* What pixel are we aiming at? */
/* -------------------------------------------------------------------- */
int iPixel, iLine;
if (STARTS_WITH_CI(pszName, "Pixel_"))
{
if (sscanf(pszName + 6, "%d_%d", &iPixel, &iLine) != 2)
return nullptr;
}
else if (STARTS_WITH_CI(pszName, "GeoPixel_"))
{
double adfGeoTransform[6];
double adfInvGeoTransform[6];
double dfGeoX, dfGeoY;
{
dfGeoX = CPLAtof(pszName + 9);
const char* pszUnderscore = strchr(pszName + 9, '_');
if (!pszUnderscore)
return nullptr;
dfGeoY = CPLAtof(pszUnderscore + 1);
}
if (m_parent_dataset->GetGeoTransform(adfGeoTransform) != CE_None)
return nullptr;
if (!GDALInvGeoTransform(adfGeoTransform, adfInvGeoTransform))
return nullptr;
iPixel = (int)floor(
adfInvGeoTransform[0]
+ adfInvGeoTransform[1] * dfGeoX
+ adfInvGeoTransform[2] * dfGeoY);
iLine = (int)floor(
adfInvGeoTransform[3]
+ adfInvGeoTransform[4] * dfGeoX
+ adfInvGeoTransform[5] * dfGeoY);
/* The GetDataset() for the WMS driver is always the main overview level, so rescale */
/* the values if we are an overview */
if (m_overview >= 0)
{
iPixel = (int)(1.0 * iPixel * GetXSize() / m_parent_dataset->GetRasterBand(1)->GetXSize());
iLine = (int)(1.0 * iLine * GetYSize() / m_parent_dataset->GetRasterBand(1)->GetYSize());
}
}
else
return nullptr;
if (iPixel < 0 || iLine < 0
|| iPixel >= GetXSize()
|| iLine >= GetYSize())
return nullptr;
if (nBand != 1)
{
GDALRasterBand* poFirstBand = m_parent_dataset->GetRasterBand(1);
if (m_overview >= 0)
poFirstBand = poFirstBand->GetOverview(m_overview);
if (poFirstBand)
return poFirstBand->GetMetadataItem(pszName, pszDomain);
}
GDALWMSImageRequestInfo iri;
GDALWMSTiledImageRequestInfo tiri;
int nBlockXOff = iPixel / nBlockXSize;
int nBlockYOff = iLine / nBlockYSize;
ComputeRequestInfo(iri, tiri, nBlockXOff, nBlockYOff);
CPLString url;
m_parent_dataset->m_mini_driver->GetTiledImageInfo(url,
iri, tiri,
iPixel % nBlockXSize,
iLine % nBlockXSize);
if (url.empty())
return nullptr;
CPLDebug("WMS", "URL = %s", url.c_str());
if (url == osMetadataItemURL)
{
// osMetadataItem.c_str() MUST be used, and not osMetadataItem,
// otherwise a temporary copy is returned
return !osMetadataItem.empty() ? osMetadataItem.c_str() : nullptr;
}
osMetadataItemURL = url;
// This is OK, CPLHTTPFetch does not touch the options
char **papszOptions = const_cast<char **>(m_parent_dataset->GetHTTPRequestOpts());
CPLHTTPResult* psResult = CPLHTTPFetch(url, papszOptions);
CPLString pszRes;
if (psResult && psResult->pabyData)
pszRes = reinterpret_cast<const char *>(psResult->pabyData);
CPLHTTPDestroyResult(psResult);
if (pszRes.empty()) {
osMetadataItem = "";
return nullptr;
}
osMetadataItem = "<LocationInfo>";
CPLPushErrorHandler(CPLQuietErrorHandler);
CPLXMLNode* psXML = CPLParseXMLString(pszRes);
CPLPopErrorHandler();
if (psXML != nullptr && psXML->eType == CXT_Element)
{
if (strcmp(psXML->pszValue, "?xml") == 0)
{
if (psXML->psNext)
{
char* pszXML = CPLSerializeXMLTree(psXML->psNext);
osMetadataItem += pszXML;
CPLFree(pszXML);
}
}
else
{
osMetadataItem += pszRes;
}
}
else
{
char* pszEscapedXML = CPLEscapeString(pszRes, -1, CPLES_XML_BUT_QUOTES);
osMetadataItem += pszEscapedXML;
CPLFree(pszEscapedXML);
}
if (psXML != nullptr)
CPLDestroyXMLNode(psXML);
osMetadataItem += "</LocationInfo>";
// osMetadataItem.c_str() MUST be used, and not osMetadataItem,
// otherwise a temporary copy is returned
return osMetadataItem.c_str();
}
static const int * GetBandMapForExpand( int nSourceBands, int nWmsBands )
{
static const int bandmap1to1[] = { 1 };
static const int bandmap2to1[] = { 1 };
static const int bandmap3to1[] = { 1 };
static const int bandmap4to1[] = { 1 };
static const int bandmap1to2[] = { 1, 0 }; // 0 == full opaque alpha band
static const int bandmap2to2[] = { 1, 2 };
static const int bandmap3to2[] = { 1, 0 };
static const int bandmap4to2[] = { 1, 4 };
static const int bandmap1to3[] = { 1, 1, 1 };
static const int bandmap2to3[] = { 1, 1, 1 };
static const int bandmap3to3[] = { 1, 2, 3 };
static const int bandmap4to3[] = { 1, 2, 3 };
static const int bandmap1to4[] = { 1, 1, 1, 0 };
static const int bandmap2to4[] = { 1, 1, 1, 2 };
static const int bandmap3to4[] = { 1, 2, 3, 0 };
static const int bandmap4to4[] = { 1, 2, 3, 4 };
static const int* const bandmap_selector[4][4] = {
{ bandmap1to1, bandmap2to1, bandmap3to1, bandmap4to1 },
{ bandmap1to2, bandmap2to2, bandmap3to2, bandmap4to2 },
{ bandmap1to3, bandmap2to3, bandmap3to3, bandmap4to3 },
{ bandmap1to4, bandmap2to4, bandmap3to4, bandmap4to4 },
};
if( nSourceBands > 4 || nSourceBands < 1 )
{
return nullptr;
}
if( nWmsBands > 4 || nWmsBands < 1 )
{
return nullptr;
}
return bandmap_selector[nWmsBands - 1][nSourceBands - 1];
}
CPLErr GDALWMSRasterBand::ReadBlockFromDataset(GDALDataset *ds, int x,
int y, int to_buffer_band,
void *buffer, int advise_read)
{
CPLErr ret = CE_None;
GByte *color_table = nullptr;
int i;
//CPLDebug("WMS", "ReadBlockFromDataset: to_buffer_band=%d, (x,y)=(%d, %d)", to_buffer_band, x, y);
/* expected size */
const int esx = MIN( MAX( 0, ( x + 1 ) * nBlockXSize ), nRasterXSize) -
MIN( MAX( 0, x * nBlockXSize ), nRasterXSize);
const int esy = MIN( MAX( 0, ( y + 1 ) * nBlockYSize ), nRasterYSize) -
MIN( MAX( 0, y * nBlockYSize ), nRasterYSize);
int sx = ds->GetRasterXSize();
int sy = ds->GetRasterYSize();
/* Allow bigger than expected so pre-tiled constant size images work on corners */
if( (sx > nBlockXSize) || (sy > nBlockYSize) || (sx < esx) || (sy < esy) )
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: Incorrect size %d x %d of downloaded block, expected %d x %d, max %d x %d.",
sx, sy, esx, esy, nBlockXSize, nBlockYSize);
ret = CE_Failure;
}
int nDSRasterCount = ds->GetRasterCount();
if( ret == CE_None )
{
if( nDSRasterCount != m_parent_dataset->nBands )
{
/* Maybe its an image with color table */
if( (eDataType == GDT_Byte) && (ds->GetRasterCount() == 1) )
{
GDALRasterBand *rb = ds->GetRasterBand(1);
if (rb->GetRasterDataType() == GDT_Byte)
{
GDALColorTable *ct = rb->GetColorTable();
if( ct != nullptr )
{
if (!advise_read)
{
color_table = new GByte[256 * 4];
const int count =
MIN( 256, ct->GetColorEntryCount() );
for (i = 0; i < count; ++i)
{
GDALColorEntry ce;
ct->GetColorEntryAsRGB(i, &ce);
color_table[i] = static_cast<GByte>(ce.c1);
color_table[i + 256] = static_cast<GByte>(ce.c2);
color_table[i + 512] = static_cast<GByte>(ce.c3);
color_table[i + 768] = static_cast<GByte>(ce.c4);
}
for (i = count; i < 256; ++i)
{
color_table[i] = 0;
color_table[i + 256] = 0;
color_table[i + 512] = 0;
color_table[i + 768] = 0;
}
}
}
else if (m_parent_dataset->nBands <= 4)
{ // Promote single band to fake color table
color_table = new GByte[256 * 4];
for( i = 0; i < 256; i++ )
{
color_table[i] = static_cast<GByte>(i);
color_table[i + 256] = static_cast<GByte>(i);
color_table[i + 512] = static_cast<GByte>(i);
color_table[i + 768] = 255; // Transparency
}
if( m_parent_dataset->nBands == 2 )
{ // Luma-Alpha fixup
for (i = 0; i < 256; i++)
{
color_table[i + 256] = 255;
}
}
}
}
}
}
}
if (!advise_read)
{
const int * const bandmap = GetBandMapForExpand( nDSRasterCount,
m_parent_dataset->nBands );
for( int ib = 1; ib <= m_parent_dataset->nBands; ++ib )
{
if (ret == CE_None)
{
void *p = nullptr;
GDALRasterBlock *b = nullptr;
if ((buffer != nullptr) && (ib == to_buffer_band))
{
p = buffer;
}
else
{
GDALWMSRasterBand *band =
static_cast<GDALWMSRasterBand *>(
m_parent_dataset->GetRasterBand(ib));
if (m_overview >= 0)
{
band = static_cast<GDALWMSRasterBand *>(
band->GetOverview(m_overview));
}
if( !band->IsBlockInCache(x, y) )
{
b = band->GetLockedBlockRef(x, y, true);
if (b != nullptr)
{
p = b->GetDataRef();
if (p == nullptr)
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: GetDataRef returned NULL.");
ret = CE_Failure;
}
}
}
else
{
//CPLDebug("WMS", "Band %d, block (x,y)=(%d, %d) already in cache", band->GetBand(), x, y);
}
}
if (p != nullptr)
{
int pixel_space = GDALGetDataTypeSizeBytes(eDataType);
int line_space = pixel_space * nBlockXSize;
if (color_table == nullptr)
{
if( bandmap == nullptr || bandmap[ib - 1] != 0 )
{
GDALDataType dt=eDataType;
int nSourceBand = ib;
if( bandmap != nullptr )
{
nSourceBand = bandmap[ib - 1];
}
// Get the data from the PNG as stored instead of converting, if the server asks for that
// TODO: This hack is from #3493 - not sure it really belongs here.
if( (GDT_Int16 == dt) &&
(GDT_UInt16 == ds->GetRasterBand(ib)->GetRasterDataType()))
{
dt = GDT_UInt16;
}
if (ds->RasterIO(GF_Read, 0, 0, sx, sy, p, sx, sy, dt,
1, &nSourceBand, pixel_space,
line_space, 0, nullptr) != CE_None)
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: RasterIO failed on downloaded block.");
ret = CE_Failure;
}
}
else // if( bandmap != nullptr && bandmap[ib - 1] == 0 )
{ // parent expects 4 bands but file has fewer count so generate a all "opaque" 4th band
GByte *byte_buffer = reinterpret_cast<GByte *>(p);
for (int l_y = 0; l_y < sy; ++l_y)
{
for (int l_x = 0; l_x < sx; ++l_x)
{
const int offset = l_x + l_y * line_space;
byte_buffer[offset] = 255; // fill with opaque
}
}
}
}
else if( ib <= 4 )
{
if( ds->RasterIO(GF_Read, 0, 0, sx, sy, p, sx, sy,
eDataType, 1, nullptr, pixel_space,
line_space, 0, nullptr) != CE_None)
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: RasterIO failed on downloaded block.");
ret = CE_Failure;
}
if (ret == CE_None)
{
GByte *band_color_table = color_table + 256 * (ib - 1);
GByte *byte_buffer = reinterpret_cast<GByte *>(p);
for (int l_y = 0; l_y < sy; ++l_y)
{
for (int l_x = 0; l_x < sx; ++l_x)
{
const int offset = l_x + l_y * line_space;
byte_buffer[offset] = band_color_table[byte_buffer[offset]];
}
}
}
}
else
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: Color table supports at most 4 components.");
ret = CE_Failure;
}
}
if (b != nullptr)
{
b->DropLock();
}
}
}
}
GDALClose(ds);
if ( color_table != nullptr )
{
delete[] color_table;
}
return ret;
}
CPLErr GDALWMSRasterBand::ReadBlockFromFile(const CPLString& soFileName, int x,
int y, int to_buffer_band,
void *buffer, int advise_read)
{
GDALDataset *ds = reinterpret_cast<GDALDataset*>(GDALOpenEx( soFileName,
GDAL_OF_RASTER
| GDAL_OF_READONLY
| GDAL_OF_VERBOSE_ERROR,
nullptr,
m_parent_dataset->m_tileOO,
nullptr ) );
if( ds == nullptr )
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: Unable to open downloaded block.");
return CE_Failure;
}
return ReadBlockFromDataset(ds, x, y, to_buffer_band, buffer, advise_read);
}
CPLErr GDALWMSRasterBand::ReadBlockFromCache(const char* pszKey, int x, int y,
int to_buffer_band, void *buffer,
int advise_read)
{
GDALWMSCache *cache = m_parent_dataset->m_cache;
if( nullptr == cache )
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: Unable to open downloaded block.");
return CE_Failure;
}
GDALDataset *ds = cache->GetDataset( pszKey, m_parent_dataset->m_tileOO );
if( ds == nullptr )
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: Unable to open downloaded block.");
return CE_Failure;
}
return ReadBlockFromDataset(ds, x, y, to_buffer_band, buffer, advise_read);
}
CPLErr GDALWMSRasterBand::EmptyBlock(int x, int y, int to_buffer_band, void *buffer) {
CPLErr ret = CE_None;
for (int ib = 1; ib <= m_parent_dataset->nBands; ++ib) {
if (ret == CE_None) {
void *p = nullptr;
GDALRasterBlock *b = nullptr;
GDALWMSRasterBand* band = static_cast<GDALWMSRasterBand*>(m_parent_dataset->GetRasterBand(ib));
if (m_overview >= 0) band = static_cast<GDALWMSRasterBand*>(band->GetOverview(m_overview));
if ((buffer != nullptr) && (ib == to_buffer_band)) {
p = buffer;
} else {
if (!band->IsBlockInCache(x, y)) {
b = band->GetLockedBlockRef(x, y, true);
if (b != nullptr) {
p = b->GetDataRef();
if (p == nullptr) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: GetDataRef returned NULL.");
ret = CE_Failure;
}
}
}
}
if (p != nullptr) {
int hasNDV;
double valNDV = band->GetNoDataValue(&hasNDV);
if (!hasNDV)
valNDV = 0;
GDALCopyWords(&valNDV, GDT_Float64, 0, p, eDataType,
GDALGetDataTypeSizeBytes(eDataType), nBlockXSize * nBlockYSize);
}
if (b != nullptr) {
b->DropLock();
}
}
}
return ret;
}
CPLErr GDALWMSRasterBand::ReportWMSException(const char *file_name) {
CPLErr ret = CE_None;
int reported_errors_count = 0;
CPLXMLNode *orig_root = CPLParseXMLFile(file_name);
CPLXMLNode *root = orig_root;
if (root != nullptr) {
root = CPLGetXMLNode(root, "=ServiceExceptionReport");
}
if (root != nullptr) {
CPLXMLNode *n = CPLGetXMLNode(root, "ServiceException");
while (n != nullptr) {
const char *exception = CPLGetXMLValue(n, "=ServiceException", "");
const char *exception_code = CPLGetXMLValue(n, "=ServiceException.code", "");
if (exception[0] != '\0') {
if (exception_code[0] != '\0') {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: The server returned exception code '%s': %s", exception_code, exception);
++reported_errors_count;
} else {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: The server returned exception: %s", exception);
++reported_errors_count;
}
} else if (exception_code[0] != '\0') {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: The server returned exception code '%s'.", exception_code);
++reported_errors_count;
}
n = n->psNext;
if (n != nullptr) {
n = CPLGetXMLNode(n, "=ServiceException");
}
}
} else {
ret = CE_Failure;
}
if (orig_root != nullptr) {
CPLDestroyXMLNode(orig_root);
}
if (reported_errors_count == 0) {
ret = CE_Failure;
}
return ret;
}
CPLErr GDALWMSRasterBand::AdviseRead(int nXOff, int nYOff,
int nXSize, int nYSize,
int nBufXSize,
int nBufYSize,
GDALDataType eDT,
char **papszOptions) {
// printf("AdviseRead(%d, %d, %d, %d)\n", nXOff, nYOff, nXSize, nYSize);
if (m_parent_dataset->m_offline_mode || !m_parent_dataset->m_use_advise_read) return CE_None;
if (m_parent_dataset->m_cache == nullptr) return CE_Failure;
/* ==================================================================== */
/* Do we have overviews that would be appropriate to satisfy */
/* this request? */
/* ==================================================================== */
if( (nBufXSize < nXSize || nBufYSize < nYSize)
&& GetOverviewCount() > 0 )
{
const int nOverview =
GDALBandGetBestOverviewLevel2( this, nXOff, nYOff, nXSize, nYSize,
nBufXSize, nBufYSize, nullptr );
if (nOverview >= 0)
{
GDALRasterBand* poOverviewBand = GetOverview(nOverview);
if (poOverviewBand == nullptr)
return CE_Failure;
return poOverviewBand->AdviseRead(
nXOff, nYOff, nXSize, nYSize,
nBufXSize, nBufYSize, eDT, papszOptions );
}
}
int bx0 = nXOff / nBlockXSize;