/* GLTexture::loadImagePortion
* Loads a portion of a SImage to the texture. Only used internally,
* the portion must be 128x128 in size
*******************************************************************/
bool GLTexture::loadImagePortion(SImage* image, rect_t rect, Palette8bit* pal, bool add)
{
// Check image was given
if (!image)
return false;
// Check image is valid
if (!image->isValid())
return false;
// Check portion rect is valid
if (rect.width() <= 0 || rect.height() <= 0)
return false;
// Get RGBA image data
MemChunk rgba;
image->getRGBAData(rgba, pal);
// Init texture data
MemChunk portion;
portion.reSize(rect.width() * rect.height() * 4, false);
portion.fillData(0);
// Read portion of image if rect isn't completely outside the image
if (!(rect.left() >= image->getWidth() || rect.right() < 0 || rect.top() >= image->getHeight() || rect.bottom() < 0))
{
// Determine start of each row to read
uint32_t row_start = 0;
if (rect.left() > 0)
row_start = rect.left();
// Determine width of each row to read
uint32_t row_width = rect.right() - row_start;
if (rect.right() >= image->getWidth())
row_width = image->getWidth() - row_start;
// Determine difference between the left of the portion and the left of the image
uint32_t skip = 0;
if (rect.left() < 0)
skip = (0 - rect.left()) * 4;
// Create temp row buffer
uint8_t* buf = new uint8_t[rect.width() * 4];
// Go through each row
for (int32_t row = rect.top(); row < rect.bottom(); row++)
{
// Clear row buffer
memset(buf, 0, rect.width() * 4);
// Check that the current row is within the image
if (row >= 0 && row < image->getHeight())
{
// Seek to current row in image data
rgba.seek((row * image->getWidth() + row_start) * 4, SEEK_SET);
// Copy the row data
rgba.read(buf + skip, row_width * 4);
}
// Write the row
portion.write(buf, rect.width() * 4);
}
// Free buffer
delete[] buf;
}
scale_x = scale_y = 1.0;
// Generate texture from rgba data
return loadData(portion.getData(), rect.width(), rect.height(), add);
}
tensor_t model_t::make_input(const image_t& image, const rect_t& region) const
{
return make_input(image, region.left(), region.top());
}
