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Diffstat (limited to 'libjpegtwrp/README-VeNum')
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diff --git a/libjpegtwrp/README-VeNum b/libjpegtwrp/README-VeNum new file mode 100644 index 000000000..ee51449c7 --- /dev/null +++ b/libjpegtwrp/README-VeNum @@ -0,0 +1,20 @@ +README-VeNum +Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum +================================================================= + +Consumers are increasingly browsing Web based photo galleries incorporating +high-resolution JPEG images with their mobile devices. These images are +decoded by the mobile device, and typically also scaled down to fit the user's +zoom selection on the device's browser. + +In order to improve both decode and download times, Qualcomm Innovation Center +has optimized the JPEG library found on many common OS platforms such as Web +OS, Android, and Chrome OS. Our team re-implemented several routines to utilize the +DSP-like SIMD capabilities of the ARM NEON instruction set. These were then +tuned and tested on Qualcomm's Snapdragon platform which implements the VeNum +implementation of these same instructions. + +The specific areas of focus cover VeNum/NEON acceleration of Inverse Discrete +Cosine Transform (iDCT) for 8x8, 4x4, 2x2, and 1x1 block sizes and YUV to RGB +color space conversion. This resulted in a range of 18-32% improvement in JPEG +decode and downscale times for images greater than 2Mpixels. |