/src/libwebp/src/utils/rescaler_utils.h

Source (jump to first uncovered line)
// 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_UTILS_H_
#define WEBP_UTILS_RESCALER_UTILS_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "src/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.
// Returns false in case of error.
int 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_UTILS_H_

Line	Count	Source (jump to first uncovered line)
1		// Copyright 2012 Google Inc. All Rights Reserved.
2		//
3		// Use of this source code is governed by a BSD-style license
4		// that can be found in the COPYING file in the root of the source
5		// tree. An additional intellectual property rights grant can be found
6		// in the file PATENTS. All contributing project authors may
7		// be found in the AUTHORS file in the root of the source tree.
8		// -----------------------------------------------------------------------------
9		//
10		// Rescaling functions
11		//
12		// Author: Skal (pascal.massimino@gmail.com)
13
14		#ifndef WEBP_UTILS_RESCALER_UTILS_H_
15		#define WEBP_UTILS_RESCALER_UTILS_H_
16
17		#ifdef __cplusplus
18		extern "C" {
19		#endif
20
21		#include "src/webp/types.h"
22
23	0	#define WEBP_RESCALER_RFIX 32 // fixed-point precision for multiplies
24	0	#define WEBP_RESCALER_ONE (1ull << WEBP_RESCALER_RFIX)
25		#define WEBP_RESCALER_FRAC(x, y) \
26	0	((uint32_t)(((uint64_t)(x) << WEBP_RESCALER_RFIX) / (y)))
27
28		// Structure used for on-the-fly rescaling
29		typedef uint32_t rescaler_t; // type for side-buffer
30		typedef struct WebPRescaler WebPRescaler;
31		struct WebPRescaler {
32		int x_expand; // true if we're expanding in the x direction
33		int y_expand; // true if we're expanding in the y direction
34		int num_channels; // bytes to jump between pixels
35		uint32_t fx_scale; // fixed-point scaling factors
36		uint32_t fy_scale; // ''
37		uint32_t fxy_scale; // ''
38		int y_accum; // vertical accumulator
39		int y_add, y_sub; // vertical increments
40		int x_add, x_sub; // horizontal increments
41		int src_width, src_height; // source dimensions
42		int dst_width, dst_height; // destination dimensions
43		int src_y, dst_y; // row counters for input and output
44		uint8_t* dst;
45		int dst_stride;
46		rescaler_t* irow, *frow; // work buffer
47		};
48
49		// Initialize a rescaler given scratch area 'work' and dimensions of src & dst.
50		// Returns false in case of error.
51		int WebPRescalerInit(WebPRescaler* const rescaler,
52		int src_width, int src_height,
53		uint8_t* const dst,
54		int dst_width, int dst_height, int dst_stride,
55		int num_channels,
56		rescaler_t* const work);
57
58		// If either 'scaled_width' or 'scaled_height' (but not both) is 0 the value
59		// will be calculated preserving the aspect ratio, otherwise the values are
60		// left unmodified. Returns true on success, false if either value is 0 after
61		// performing the scaling calculation.
62		int WebPRescalerGetScaledDimensions(int src_width, int src_height,
63		int* const scaled_width,
64		int* const scaled_height);
65
66		// Returns the number of input lines needed next to produce one output line,
67		// considering that the maximum available input lines are 'max_num_lines'.
68		int WebPRescaleNeededLines(const WebPRescaler* const rescaler,
69		int max_num_lines);
70
71		// Import multiple rows over all channels, until at least one row is ready to
72		// be exported. Returns the actual number of lines that were imported.
73		int WebPRescalerImport(WebPRescaler* const rescaler, int num_rows,
74		const uint8_t* src, int src_stride);
75
76		// Export as many rows as possible. Return the numbers of rows written.
77		int WebPRescalerExport(WebPRescaler* const rescaler);
78
79		// Return true if input is finished
80		static WEBP_INLINE
81	0	int WebPRescalerInputDone(const WebPRescaler* const rescaler) {
82	0	return (rescaler->src_y >= rescaler->src_height);
83	0	} Unexecuted instantiation: webp_dec.c:WebPRescalerInputDone Unexecuted instantiation: rescaler_utils.c:WebPRescalerInputDone Unexecuted instantiation: buffer_dec.c:WebPRescalerInputDone Unexecuted instantiation: frame_dec.c:WebPRescalerInputDone Unexecuted instantiation: io_dec.c:WebPRescalerInputDone Unexecuted instantiation: vp8_dec.c:WebPRescalerInputDone Unexecuted instantiation: vp8l_dec.c:WebPRescalerInputDone Unexecuted instantiation: dec.c:WebPRescalerInputDone Unexecuted instantiation: lossless.c:WebPRescalerInputDone Unexecuted instantiation: rescaler.c:WebPRescalerInputDone Unexecuted instantiation: dec_sse2.c:WebPRescalerInputDone Unexecuted instantiation: rescaler_sse2.c:WebPRescalerInputDone Unexecuted instantiation: dec_sse41.c:WebPRescalerInputDone Unexecuted instantiation: alpha_dec.c:WebPRescalerInputDone Unexecuted instantiation: quant_dec.c:WebPRescalerInputDone Unexecuted instantiation: tree_dec.c:WebPRescalerInputDone Unexecuted instantiation: picture_rescale_enc.c:WebPRescalerInputDone
84		// Return true if output is finished
85		static WEBP_INLINE
86	0	int WebPRescalerOutputDone(const WebPRescaler* const rescaler) {
87	0	return (rescaler->dst_y >= rescaler->dst_height);
88	0	} Unexecuted instantiation: webp_dec.c:WebPRescalerOutputDone Unexecuted instantiation: rescaler_utils.c:WebPRescalerOutputDone Unexecuted instantiation: buffer_dec.c:WebPRescalerOutputDone Unexecuted instantiation: frame_dec.c:WebPRescalerOutputDone Unexecuted instantiation: io_dec.c:WebPRescalerOutputDone Unexecuted instantiation: vp8_dec.c:WebPRescalerOutputDone Unexecuted instantiation: vp8l_dec.c:WebPRescalerOutputDone Unexecuted instantiation: dec.c:WebPRescalerOutputDone Unexecuted instantiation: lossless.c:WebPRescalerOutputDone Unexecuted instantiation: rescaler.c:WebPRescalerOutputDone Unexecuted instantiation: dec_sse2.c:WebPRescalerOutputDone Unexecuted instantiation: rescaler_sse2.c:WebPRescalerOutputDone Unexecuted instantiation: dec_sse41.c:WebPRescalerOutputDone Unexecuted instantiation: alpha_dec.c:WebPRescalerOutputDone Unexecuted instantiation: quant_dec.c:WebPRescalerOutputDone Unexecuted instantiation: tree_dec.c:WebPRescalerOutputDone Unexecuted instantiation: picture_rescale_enc.c:WebPRescalerOutputDone
89
90		// Return true if there are pending output rows ready.
91		static WEBP_INLINE
92	0	int WebPRescalerHasPendingOutput(const WebPRescaler* const rescaler) {
93	0	return !WebPRescalerOutputDone(rescaler) && (rescaler->y_accum <= 0);
94	0	} Unexecuted instantiation: webp_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: rescaler_utils.c:WebPRescalerHasPendingOutput Unexecuted instantiation: buffer_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: frame_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: io_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: vp8_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: vp8l_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: lossless.c:WebPRescalerHasPendingOutput Unexecuted instantiation: rescaler.c:WebPRescalerHasPendingOutput Unexecuted instantiation: dec_sse2.c:WebPRescalerHasPendingOutput Unexecuted instantiation: rescaler_sse2.c:WebPRescalerHasPendingOutput Unexecuted instantiation: dec_sse41.c:WebPRescalerHasPendingOutput Unexecuted instantiation: alpha_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: quant_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: tree_dec.c:WebPRescalerHasPendingOutput Unexecuted instantiation: picture_rescale_enc.c:WebPRescalerHasPendingOutput
95
96		//------------------------------------------------------------------------------
97
98		#ifdef __cplusplus
99		} // extern "C"
100		#endif
101
102		#endif // WEBP_UTILS_RESCALER_UTILS_H_

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Created: 2025-06-13 06:48