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TIFF I/O : update and fix logic handling rgba vs grey scale.

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This commit is contained in:
artemp 2017-05-12 18:39:58 +02:00
parent e62bf6e18f
commit e8cd4b9aef
1 changed files with 5 additions and 6 deletions
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9
src/tiff_reader.cpp
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@ -271,7 +271,6 @@ void tiff_reader<T>::init()
TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &planar_config_);
TIFFGetField(tif, TIFFTAG_COMPRESSION, &compression_ );
TIFFGetField(tif, TIFFTAG_ROWSPERSTRIP, &rows_per_strip_);
std::uint16_t orientation;
if (TIFFGetField(tif, TIFFTAG_ORIENTATION, &orientation) == 0)
@ -684,7 +683,7 @@ void tiff_reader<T>::read_tiled(std::size_t x0,std::size_t y0, ImageData & image
std::size_t end_x = ((x0 + width) / tile_width_ + 1) * tile_width_;
end_y = std::min(end_y, height_);
end_x = std::min(end_x, width_);
bool pick_first_band = (bands_ > 1) && (tile_size / (width * height * sizeof(pixel_type)) == bands_);
for (std::size_t y = start_y; y < end_y; y += tile_height_)
{
std::size_t ty0 = std::max(y0, y) - y;
@ -697,7 +696,7 @@ void tiff_reader<T>::read_tiled(std::size_t x0,std::size_t y0, ImageData & image
MAPNIK_LOG_DEBUG(tiff_reader) << "read_tile(...) failed at " << x << "/" << y << " for " << width_ << "/" << height_ << "\n";
break;
}
if (bands_ > 1)
if (pick_first_band)
{
std::uint32_t size = tile_width_ * tile_height_;
for (std::uint32_t n = 0; n < size; ++n)
@ -722,7 +721,6 @@ template <typename ImageData>
void tiff_reader<T>::read_stripped(std::size_t x0, std::size_t y0, ImageData & image)
{
using pixel_type = typename detail::tiff_reader_traits<ImageData>::pixel_type;
TIFF* tif = open(stream_);
if (tif)
{
@ -738,6 +736,7 @@ void tiff_reader<T>::read_stripped(std::size_t x0, std::size_t y0, ImageData & i
tx0 = x0;
tx1 = std::min(width + x0, width_);
std::size_t row = 0;
bool pick_first_band = (bands_ > 1) && (strip_size / (width_ * rows_per_strip_ * sizeof(pixel_type)) == bands_);
for (std::size_t y = start_y; y < end_y; y += rows_per_strip_)
{
ty0 = std::max(y0, y) - y;
@ -748,7 +747,7 @@ void tiff_reader<T>::read_stripped(std::size_t x0, std::size_t y0, ImageData & i
MAPNIK_LOG_DEBUG(tiff_reader) << "TIFFRead(Encoded|RGBA)Strip failed at " << y << " for " << width_ << "/" << height_ << "\n";
break;
}
if (bands_ > 1) // pick first band by default
if (pick_first_band)
{
std::uint32_t size = width_ * rows_per_strip_;
for (std::uint32_t n = 0; n < size; ++n)