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;
}
void GImage::encodeTGA(
BinaryOutput& out) const {
out.setEndian(G3D_LITTLE_ENDIAN);
// ID length
out.writeUInt8(0);
// Color map Type
out.writeUInt8(0);
// Type
out.writeUInt8(2);
// Color map
out.skip(5);
// x, y offsets
out.writeUInt16(0);
out.writeUInt16(0);
// Width & height
out.writeUInt16(m_width);
out.writeUInt16(m_height);
// Color depth
if (m_channels == 1) {
// Force RGB mode
out.writeUInt8(8 * 3);
} else {
out.writeUInt8(8 * m_channels);
}
// Image descriptor
if (m_channels < 4) {
// 0 alpha bits
out.writeUInt8(0);
} else {
// 8 alpha bits
out.writeUInt8(8);
}
// Image ID (zero length)
if (m_channels == 1) {
// Pixels are upside down in BGR format.
for (int y = m_height - 1; y >= 0; --y) {
for (int x = 0; x < m_width; ++x) {
uint8 p = (m_byte[(y * m_width + x)]);
out.writeUInt8(p);
out.writeUInt8(p);
out.writeUInt8(p);
}
}
} else if (m_channels == 3) {
// Pixels are upside down in BGR format.
for (int y = m_height - 1; y >= 0; --y) {
for (int x = 0; x < m_width; ++x) {
uint8* p = &(m_byte[3 * (y * m_width + x)]);
out.writeUInt8(p[2]);
out.writeUInt8(p[1]);
out.writeUInt8(p[0]);
}
}
} else {
// Pixels are upside down in BGRA format.
for (int y = m_height - 1; y >= 0; --y) {
for (int x = 0; x < m_width; ++x) {
uint8* p = &(m_byte[4 * (y * m_width + x)]);
out.writeUInt8(p[2]);
out.writeUInt8(p[1]);
out.writeUInt8(p[0]);
out.writeUInt8(p[3]);
}
}
}
// Write "TRUEVISION-XFILE " 18 bytes from the end
// (with null termination)
out.writeString("TRUEVISION-XFILE ");
}