本文整理汇总了C++中GImage::convertToRGB方法的典型用法代码示例。如果您正苦于以下问题：C++ GImage::convertToRGB方法的具体用法？C++ GImage::convertToRGB怎么用？C++ GImage::convertToRGB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GImage的用法示例。
在下文中一共展示了GImage::convertToRGB方法的1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: encodeJPEG
void GImage::encodeJPEG(
BinaryOutput& out) const {
if (channels != 3) {
// Convert to three channel
GImage tmp = *this;
tmp.convertToRGB();
tmp.encodeJPEG(out);
return;
}
debugAssert(channels == 3);
out.setEndian(G3D_LITTLE_ENDIAN);
// Allocate and initialize a compression object
jpeg_compress_struct cinfo;
jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
// Specify the destination for the compressed data.
// (Overestimate the size)
int buffer_size = width * height * 3 + 200;
JOCTET* compressed_data = (JOCTET*)System::malloc(buffer_size);
jpeg_memory_dest(&cinfo, compressed_data, buffer_size);
cinfo.image_width = width;
cinfo.image_height = height;
// # of color components per pixel
cinfo.input_components = 3;
// colorspace of input image
cinfo.in_color_space = JCS_RGB;
cinfo.input_gamma = 1.0;
// Set parameters for compression, including image size & colorspace
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, jpegQuality, false);
cinfo.smoothing_factor = 0;
cinfo.optimize_coding = TRUE;
// cinfo.dct_method = JDCT_FLOAT;
cinfo.dct_method = JDCT_ISLOW;
cinfo.jpeg_color_space = JCS_YCbCr;
// Initialize the compressor
jpeg_start_compress(&cinfo, TRUE);
// Iterate over all scanlines from top to bottom
// pointer to a single row
JSAMPROW row_pointer[1];
// JSAMPLEs per row in image_buffer
int row_stride = cinfo.image_width * 3;
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer[0] = &(_byte[cinfo.next_scanline * row_stride]);
jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
// Shut down the compressor
jpeg_finish_compress(&cinfo);
// Figure out how big the result was.
int outLength = ((mem_dest_ptr)cinfo.dest)->count;
// Release the JPEG compression object
jpeg_destroy_compress(&cinfo);
// Copy into an appropriately sized output buffer.
out.writeBytes(compressed_data, outLength);
// Free the conservative buffer.
System::free(compressed_data);
compressed_data = NULL;
}