diff options
Diffstat (limited to 'android/utils/jpeg-compress.c')
| -rw-r--r-- | android/utils/jpeg-compress.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/android/utils/jpeg-compress.c b/android/utils/jpeg-compress.c index 2b42a00..cd45bf5 100644 --- a/android/utils/jpeg-compress.c +++ b/android/utils/jpeg-compress.c @@ -151,12 +151,14 @@ jpeg_compressor_get_header_size(const AJPEGDesc* dsc) void jpeg_compressor_compress_fb(AJPEGDesc* dsc, - int x, int y, int w, int h, + int x, int y, int w, int h, int num_lines, int bpp, int bpl, const uint8_t* fb, - int jpeg_quality){ + int jpeg_quality, + int ydir){ struct jpeg_compress_struct cinfo = {0}; struct jpeg_error_mgr err_mgr; + const int x_shift = x * bpp; /* * Initialize compressin information structure, and start compression @@ -186,9 +188,17 @@ jpeg_compressor_compress_fb(AJPEGDesc* dsc, jpeg_start_compress(&cinfo, TRUE); /* Line by line compress the region. */ - while (cinfo.next_scanline < cinfo.image_height) { - JSAMPROW rgb = (JSAMPROW)(fb + (cinfo.next_scanline + y) * bpl + x * bpp); - jpeg_write_scanlines(&cinfo, (JSAMPARRAY)&rgb, 1); + if (ydir >= 0) { + while (cinfo.next_scanline < cinfo.image_height) { + JSAMPROW rgb = (JSAMPROW)(fb + (cinfo.next_scanline + y) * bpl + x_shift); + jpeg_write_scanlines(&cinfo, (JSAMPARRAY)&rgb, 1); + } + } else { + const int y_shift = num_lines - y - 1; + while (cinfo.next_scanline < cinfo.image_height) { + JSAMPROW rgb = (JSAMPROW)(fb + (y_shift - cinfo.next_scanline) * bpl + x_shift); + jpeg_write_scanlines(&cinfo, (JSAMPARRAY)&rgb, 1); + } } /* Complete the compression. */ |