本文整理汇总了C++中GDALWMSRasterBand类的典型用法代码示例。如果您正苦于以下问题：C++ GDALWMSRasterBand类的具体用法？C++ GDALWMSRasterBand怎么用？C++ GDALWMSRasterBand使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了GDALWMSRasterBand类的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: ZeroBlock
CPLErr GDALWMSRasterBand::ZeroBlock(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 = NULL;
GDALRasterBlock *b = NULL;
if ((buffer != NULL) && (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 != NULL) {
p = b->GetDataRef();
if (p == NULL) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: GetDataRef returned NULL.");
ret = CE_Failure;
}
}
}
}
if (p != NULL) {
unsigned char *b = reinterpret_cast<unsigned char *>(p);
int block_size = nBlockXSize * nBlockYSize * (GDALGetDataTypeSize(eDataType) / 8);
for (int i = 0; i < block_size; ++i) b[i] = 0;
}
if (b != NULL) {
b->DropLock();
}
}
}
return ret;
}示例2: CSLAddString
CPLErr GDALWMSRasterBand::ReadBlocks(int x, int y, void *buffer, int bx0, int by0, int bx1, int by1, int advise_read) {
CPLErr ret = CE_None;
int i;
int max_request_count = (bx1 - bx0 + 1) * (by1 - by0 + 1);
int request_count = 0;
CPLHTTPRequest *download_requests = NULL;
GDALWMSCache *cache = m_parent_dataset->m_cache;
struct BlockXY {
int x, y;
} *download_blocks = NULL;
if (!m_parent_dataset->m_offline_mode) {
download_requests = new CPLHTTPRequest[max_request_count];
download_blocks = new BlockXY[max_request_count];
}
char **http_request_opts = NULL;
if (m_parent_dataset->m_http_timeout != -1) {
CPLString http_request_optstr;
http_request_optstr.Printf("TIMEOUT=%d", m_parent_dataset->m_http_timeout);
http_request_opts = CSLAddString(http_request_opts, http_request_optstr.c_str());
}
for (int iy = by0; iy <= by1; ++iy) {
for (int ix = bx0; ix <= bx1; ++ix) {
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;
}
CPLString url;
if (need_this_block) {
CPLString file_name;
AskMiniDriverForBlock(&url, ix, iy);
if ((cache != NULL) && (cache->Read(url.c_str(), &file_name) == CE_None)) {
if (advise_read) {
need_this_block = false;
} else {
void *p = 0;
if ((ix == x) && (iy == y)) p = buffer;
if (ReadBlockFromFile(ix, iy, file_name.c_str(), nBand, p, 0) == CE_None) need_this_block = false;
}
}
}
if (need_this_block) {
if (m_parent_dataset->m_offline_mode) {
if (!advise_read) {
void *p = 0;
if ((ix == x) && (iy == y)) p = buffer;
if (ZeroBlock(ix, iy, nBand, p) != CE_None) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: ZeroBlock failed.");
ret = CE_Failure;
}
}
} else {
CPLHTTPInitializeRequest(&download_requests[request_count], url.c_str(), http_request_opts);
download_blocks[request_count].x = ix;
download_blocks[request_count].y = iy;
++request_count;
}
}
}
}
if (http_request_opts != NULL) {
CSLDestroy(http_request_opts);
}
if (request_count > 0) {
char **opts = NULL;
CPLString optstr;
if (m_parent_dataset->m_http_max_conn != -1) {
optstr.Printf("MAXCONN=%d", m_parent_dataset->m_http_max_conn);
opts = CSLAddString(opts, optstr.c_str());
}
if (CPLHTTPFetchMulti(download_requests, request_count, opts) != CE_None) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: CPLHTTPFetchMulti failed.");
ret = CE_Failure;
}
if (opts != NULL) {
CSLDestroy(opts);
}
}
for (i = 0; i < request_count; ++i) {
if (ret == CE_None) {
if ((download_requests[i].nStatus == 200) && (download_requests[i].pabyData != NULL) && (download_requests[i].nDataLen > 0)) {
CPLString file_name(BufferToVSIFile(download_requests[i].pabyData, download_requests[i].nDataLen));
if (file_name.size() > 0) {
/* check for error xml */
if (download_requests[i].nDataLen >= 20) {
const char *download_data = reinterpret_cast<char *>(download_requests[i].pabyData);
if (EQUALN(download_data, "<?xml ", 6)
//.........这里部分代码省略.........
示例3: CPLSerializeXMLTree
//.........这里部分代码省略.........
if (ret == CE_None)
{
const char *data_type = CPLGetXMLValue(config, "DataType", "Byte");
m_data_type = GDALGetDataTypeByName( data_type );
if ( m_data_type == GDT_Unknown || m_data_type >= GDT_TypeCount )
{
CPLError( CE_Failure, CPLE_AppDefined,
"GDALWMS: Invalid value in DataType. Data type \"%s\" is not supported.", data_type );
ret = CE_Failure;
}
}
// Initialize the bands and the overviews. Assumes overviews are powers of two
if (ret == CE_None)
{
nRasterXSize = m_data_window.m_sx;
nRasterYSize = m_data_window.m_sy;
if (!GDALCheckDatasetDimensions(nRasterXSize, nRasterYSize) ||
!GDALCheckBandCount(nBands, TRUE))
{
return CE_Failure;
}
GDALColorInterp default_color_interp[4][4] = {
{ GCI_GrayIndex, GCI_Undefined, GCI_Undefined, GCI_Undefined },
{ GCI_GrayIndex, GCI_AlphaBand, GCI_Undefined, GCI_Undefined },
{ GCI_RedBand, GCI_GreenBand, GCI_BlueBand, GCI_Undefined },
{ GCI_RedBand, GCI_GreenBand, GCI_BlueBand, GCI_AlphaBand }
};
for (int i = 0; i < nBands; ++i)
{
GDALColorInterp color_interp = (nBands <= 4 && i <= 3 ? default_color_interp[nBands - 1][i] : GCI_Undefined);
GDALWMSRasterBand *band = new GDALWMSRasterBand(this, i, 1.0);
band->m_color_interp = color_interp;
SetBand(i + 1, band);
double scale = 0.5;
for (int j = 0; j < nOverviews; ++j)
{
band->AddOverview(scale);
band->m_color_interp = color_interp;
scale *= 0.5;
}
}
}
}
// UserPwd
const char *pszUserPwd = CPLGetXMLValue(config, "UserPwd", "");
if (pszUserPwd[0] != '\0')
m_osUserPwd = pszUserPwd;
const char *pszUserAgent = CPLGetXMLValue(config, "UserAgent", "");
if (pszUserAgent[0] != '\0')
m_osUserAgent = pszUserAgent;
const char *pszReferer = CPLGetXMLValue(config, "Referer", "");
if (pszReferer[0] != '\0')
m_osReferer = pszReferer;
if (ret == CE_None) {
const char *pszHttpZeroBlockCodes = CPLGetXMLValue(config, "ZeroBlockHttpCodes", "");
if(pszHttpZeroBlockCodes[0] == '\0') {
m_http_zeroblock_codes.push_back(204);
} else {
char **kv = CSLTokenizeString2(pszHttpZeroBlockCodes,",",CSLT_HONOURSTRINGS);示例4: MIN
CPLErr GDALWMSRasterBand::ReadBlockFromFile(int x, int y, const char *file_name, int to_buffer_band, void *buffer, int advise_read) {
CPLErr ret = CE_None;
GDALDataset *ds = 0;
GByte *color_table = NULL;
int i;
//CPLDebug("WMS", "ReadBlockFromFile: 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);
ds = reinterpret_cast<GDALDataset*>(GDALOpen(file_name, GA_ReadOnly));
if (ds != NULL) {
int sx = ds->GetRasterXSize();
int sy = ds->GetRasterYSize();
bool accepted_as_no_alpha = false; // if the request is for 4 bands but the wms returns 3
/* 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;
}
if (ret == CE_None) {
int nDSRasterCount = ds->GetRasterCount();
if (nDSRasterCount != m_parent_dataset->nBands) {
/* Maybe its an image with color table */
bool accepted_as_ct = false;
if ((eDataType == GDT_Byte) && (ds->GetRasterCount() == 1)) {
GDALRasterBand *rb = ds->GetRasterBand(1);
if (rb->GetRasterDataType() == GDT_Byte) {
GDALColorTable *ct = rb->GetColorTable();
if (ct != NULL) {
accepted_as_ct = true;
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;
}
}
}
}
}
if (nDSRasterCount == 4 && m_parent_dataset->nBands == 3)
{
/* metacarta TMS service sometimes return a 4 band PNG instead of the expected 3 band... */
}
else if (!accepted_as_ct) {
if (ds->GetRasterCount()==3 && m_parent_dataset->nBands == 4 && (eDataType == GDT_Byte))
{ // WMS returned a file with no alpha so we will fill the alpha band with "opaque"
accepted_as_no_alpha = true;
}
else
{
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Incorrect bands count %d in downloaded block, expected %d.",
nDSRasterCount, m_parent_dataset->nBands);
ret = CE_Failure;
}
}
}
}
if (!advise_read) {
for (int ib = 1; ib <= m_parent_dataset->nBands; ++ib) {
if (ret == CE_None) {
void *p = NULL;
GDALRasterBlock *b = NULL;
if ((buffer != NULL) && (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 != NULL) {
p = b->GetDataRef();
if (p == NULL) {
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 != NULL) {
int pixel_space = GDALGetDataTypeSize(eDataType) / 8;
//.........这里部分代码省略.........
示例5: CPLGetXMLValue
//.........这里部分代码省略.........
}
}
}
}
if (ret == CE_None) {
const char *proj = CPLGetXMLValue(config, "Projection", "");
if (proj[0] != '\0') {
m_projection = ProjToWKT(proj);
if (m_projection.size() == 0) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Bad projection specified.");
ret = CE_Failure;
}
}
}
const char *bands_count = CPLGetXMLValue(config, "BandsCount", "3");
int nBandCount = atoi(bands_count);
if (ret == CE_None) {
CPLXMLNode *cache_node = CPLGetXMLNode(config, "Cache");
if (cache_node != NULL) {
m_cache = new GDALWMSCache();
if (m_cache->Initialize(cache_node) != CE_None) {
delete m_cache;
m_cache = NULL;
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Failed to initialize cache.");
ret = CE_Failure;
}
}
}
if (ret == CE_None) {
CPLXMLNode *service_node = CPLGetXMLNode(config, "Service");
if (service_node != NULL) {
const char *service_name = CPLGetXMLValue(service_node, "name", "");
if (service_name[0] != '\0') {
GDALWMSMiniDriverManager *const mdm = GetGDALWMSMiniDriverManager();
GDALWMSMiniDriverFactory *const mdf = mdm->Find(CPLString(service_name));
if (mdf != NULL) {
m_mini_driver = mdf->New();
m_mini_driver->m_parent_dataset = this;
if (m_mini_driver->Initialize(service_node) == CE_None) {
m_mini_driver_caps.m_capabilities_version = -1;
m_mini_driver->GetCapabilities(&m_mini_driver_caps);
if (m_mini_driver_caps.m_capabilities_version == -1) {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Internal error, mini-driver capabilities version not set.");
ret = CE_Failure;
}
} else {
delete m_mini_driver;
m_mini_driver = NULL;
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Failed to initialize minidriver.");
ret = CE_Failure;
}
} else {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: No mini-driver registered for '%s'.", service_name);
ret = CE_Failure;
}
} else {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: No Service specified.");
ret = CE_Failure;
}
} else {
CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: No Service specified.");
ret = CE_Failure;
}
}
if (ret == CE_None) {
nRasterXSize = m_data_window.m_sx;
nRasterYSize = m_data_window.m_sy;
if (!GDALCheckDatasetDimensions(nRasterXSize, nRasterYSize) ||
!GDALCheckBandCount(nBandCount, TRUE))
{
return CE_Failure;
}
for (int i = 0; i < nBandCount; ++i) {
GDALWMSRasterBand *band = new GDALWMSRasterBand(this, i, 1.0);
SetBand(i + 1, band);
double scale = 0.5;
for (int j = 0; j < m_overview_count; ++j) {
band->AddOverview(scale);
scale *= 0.5;
}
}
}
if (ret == CE_None) {
/* If we dont have projection already set ask mini-driver. */
if (!m_projection.size()) {
const char *proj = m_mini_driver->GetProjectionInWKT();
if (proj != NULL) {
m_projection = proj;
}
}
}
return ret;
}