bool save_image_file (agg::rendering_buffer& rbuf, const char *fn)
{
FILE* fd = fopen(fn, "wb");
if(fd == 0) return false;
unsigned w = rbuf.width();
unsigned h = rbuf.height();
fprintf(fd, "P6\n%d %d\n255\n", w, h);
unsigned y;
agg::pod_array<unsigned char> row_buf(w * 3);
unsigned char *tmp_buf = row_buf.data();
for(y = 0; y < rbuf.height(); y++)
{
const unsigned char* src = rbuf.row_ptr(app_flip_y ? h - 1 - y : y);
agg::color_conv_row(tmp_buf, src, w, agg::color_conv_bgr24_to_rgb24());
fwrite(tmp_buf, 1, w * 3, fd);
}
fclose(fd);
return true;
}
bool JPEG::Encode (ImageBuffer *imageBuffer, Bytes *bytes, int quality) {
struct jpeg_compress_struct cinfo;
struct ErrorData jpegError;
cinfo.err = jpeg_std_error (&jpegError.base);
jpegError.base.error_exit = OnError;
jpegError.base.output_message = OnOutput;
MyDestManager dest;
int w = imageBuffer->width;
int h = imageBuffer->height;
QuickVec<unsigned char> row_buf (w * 3);
jpeg_create_compress (&cinfo);
if (setjmp (jpegError.on_error)) {
jpeg_destroy_compress (&cinfo);
return false;
}
cinfo.dest = (jpeg_destination_mgr *)&dest;
cinfo.image_width = w;
cinfo.image_height = h;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults (&cinfo);
jpeg_set_quality (&cinfo, quality, true);
jpeg_start_compress (&cinfo, true);
JSAMPROW row_pointer = &row_buf[0];
unsigned char* imageData = imageBuffer->data->Data();
int stride = imageBuffer->Stride ();
while (cinfo.next_scanline < cinfo.image_height) {
const unsigned char *src = (const unsigned char *)(imageData + (stride * cinfo.next_scanline));
unsigned char *dest = &row_buf[0];
for(int x = 0; x < w; x++) {
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
dest += 3;
src += 4;
}
jpeg_write_scanlines (&cinfo, &row_pointer, 1);
}
jpeg_finish_compress (&cinfo);
bytes->Set (dest.mOutput);
return true;
}