本文整理汇总了C++中GDALWMSRasterBand::GetLockedBlockRef方法的典型用法代码示例。如果您正苦于以下问题：C++ GDALWMSRasterBand::GetLockedBlockRef方法的具体用法？C++ GDALWMSRasterBand::GetLockedBlockRef怎么用？C++ GDALWMSRasterBand::GetLockedBlockRef使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类GDALWMSRasterBand的用法示例。
在下文中一共展示了GDALWMSRasterBand::GetLockedBlockRef方法的2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: ReadBlockFromFile
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.........