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add WebPPictureImportRGBX() and WebPPictureImportBGRX()

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When importing BGRA or RGBA data for encoding, provide variants of
the WEBPImportPicture API for RGBX and BRGX data meaning the alpha
channel should be ignored.

Author: noel@chromium.org
from Chromium patch: https://chromiumcodereview.appspot.com/10496016/

Change-Id: I15fcaa4160c69a2b5549394204b6e6d7a1c5d333
This commit is contained in:
Noel Chromium 2012-06-05 00:26:17 -07:00 committed by Pascal Massimino
parent 437999fb77
commit 27519bc2b6
2 changed files with 19 additions and 2 deletions
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10
src/enc/picture.c
View File

@ -604,6 +604,16 @@ int WebPPictureImportBGRA(WebPPicture* const picture,
return Import(picture, rgba, rgba_stride, 4, 1, 1);
}
int WebPPictureImportRGBX(WebPPicture* const picture,
const uint8_t* const rgba, int rgba_stride) {
return Import(picture, rgba, rgba_stride, 4, 0, 0);
}
int WebPPictureImportBGRX(WebPPicture* const picture,
const uint8_t* const rgba, int rgba_stride) {
return Import(picture, rgba, rgba_stride, 4, 1, 0);
}
//------------------------------------------------------------------------------
// Helper: clean up fully transparent area to help compressibility.

11
src/webp/encode.h
View File

@ -278,15 +278,22 @@ WEBP_EXTERN(int) WebPPictureRescale(WebPPicture* const pic,
// Returns 0 in case of memory error.
WEBP_EXTERN(int) WebPPictureImportRGB(
WebPPicture* const picture, const uint8_t* const rgb, int rgb_stride);
// Same, but for RGBA buffer
// Same, but for RGBA buffer.
WEBP_EXTERN(int) WebPPictureImportRGBA(
WebPPicture* const picture, const uint8_t* const rgba, int rgba_stride);
// Same, but for RGBA buffer. Imports the RGB direct from the 32-bit format
// input buffer ignoring the alpha channel. Avoids needing to copy the data
// to a temporary 24-bit RGB buffer to import the RGB only.
WEBP_EXTERN(int) WebPPictureImportRGBX(
WebPPicture* const picture, const uint8_t* const rgbx, int rgbx_stride);
// Variant of the above, but taking BGR(A) input:
// Variants of the above, but taking BGR(A|X) input.
WEBP_EXTERN(int) WebPPictureImportBGR(
WebPPicture* const picture, const uint8_t* const bgr, int bgr_stride);
WEBP_EXTERN(int) WebPPictureImportBGRA(
WebPPicture* const picture, const uint8_t* const bgra, int bgra_stride);
WEBP_EXTERN(int) WebPPictureImportBGRX(
WebPPicture* const picture, const uint8_t* const bgrx, int bgrx_stride);
// Helper function: given a width x height plane of YUV(A) samples
// (with stride 'stride'), clean-up the YUV samples under fully transparent