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Diffstat (limited to 'drivers/webp/utils/rescaler.h')
| -rw-r--r-- | drivers/webp/utils/rescaler.h | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/drivers/webp/utils/rescaler.h b/drivers/webp/utils/rescaler.h deleted file mode 100644 index 868467b4d7..0000000000 --- a/drivers/webp/utils/rescaler.h +++ /dev/null @@ -1,101 +0,0 @@ -// Copyright 2012 Google Inc. All Rights Reserved. -// -// Use of this source code is governed by a BSD-style license -// that can be found in the COPYING file in the root of the source -// tree. An additional intellectual property rights grant can be found -// in the file PATENTS. All contributing project authors may -// be found in the AUTHORS file in the root of the source tree. -// ----------------------------------------------------------------------------- -// -// Rescaling functions -// -// Author: Skal (pascal.massimino@gmail.com) - -#ifndef WEBP_UTILS_RESCALER_H_ -#define WEBP_UTILS_RESCALER_H_ - -#ifdef __cplusplus -extern "C" { -#endif - -#include "webp/types.h" - -#define WEBP_RESCALER_RFIX 32 // fixed-point precision for multiplies -#define WEBP_RESCALER_ONE (1ull << WEBP_RESCALER_RFIX) -#define WEBP_RESCALER_FRAC(x, y) \ - ((uint32_t)(((uint64_t)(x) << WEBP_RESCALER_RFIX) / (y))) - -// Structure used for on-the-fly rescaling -typedef uint32_t rescaler_t; // type for side-buffer -typedef struct WebPRescaler WebPRescaler; -struct WebPRescaler { - int x_expand; // true if we're expanding in the x direction - int y_expand; // true if we're expanding in the y direction - int num_channels; // bytes to jump between pixels - uint32_t fx_scale; // fixed-point scaling factors - uint32_t fy_scale; // '' - uint32_t fxy_scale; // '' - int y_accum; // vertical accumulator - int y_add, y_sub; // vertical increments - int x_add, x_sub; // horizontal increments - int src_width, src_height; // source dimensions - int dst_width, dst_height; // destination dimensions - int src_y, dst_y; // row counters for input and output - uint8_t* dst; - int dst_stride; - rescaler_t* irow, *frow; // work buffer -}; - -// Initialize a rescaler given scratch area 'work' and dimensions of src & dst. -void WebPRescalerInit(WebPRescaler* const rescaler, - int src_width, int src_height, - uint8_t* const dst, - int dst_width, int dst_height, int dst_stride, - int num_channels, - rescaler_t* const work); - -// If either 'scaled_width' or 'scaled_height' (but not both) is 0 the value -// will be calculated preserving the aspect ratio, otherwise the values are -// left unmodified. Returns true on success, false if either value is 0 after -// performing the scaling calculation. -int WebPRescalerGetScaledDimensions(int src_width, int src_height, - int* const scaled_width, - int* const scaled_height); - -// Returns the number of input lines needed next to produce one output line, -// considering that the maximum available input lines are 'max_num_lines'. -int WebPRescaleNeededLines(const WebPRescaler* const rescaler, - int max_num_lines); - -// Import multiple rows over all channels, until at least one row is ready to -// be exported. Returns the actual number of lines that were imported. -int WebPRescalerImport(WebPRescaler* const rescaler, int num_rows, - const uint8_t* src, int src_stride); - -// Export as many rows as possible. Return the numbers of rows written. -int WebPRescalerExport(WebPRescaler* const rescaler); - -// Return true if input is finished -static WEBP_INLINE -int WebPRescalerInputDone(const WebPRescaler* const rescaler) { - return (rescaler->src_y >= rescaler->src_height); -} -// Return true if output is finished -static WEBP_INLINE -int WebPRescalerOutputDone(const WebPRescaler* const rescaler) { - return (rescaler->dst_y >= rescaler->dst_height); -} - -// Return true if there are pending output rows ready. -static WEBP_INLINE -int WebPRescalerHasPendingOutput(const WebPRescaler* const rescaler) { - return !WebPRescalerOutputDone(rescaler) && (rescaler->y_accum <= 0); -} - -//------------------------------------------------------------------------------ - -#ifdef __cplusplus -} // extern "C" -#endif - -#endif /* WEBP_UTILS_RESCALER_H_ */ |