diff options
Diffstat (limited to 'src/3rdparty/libwebp/src/utils/rescaler.h')
| -rw-r--r-- | src/3rdparty/libwebp/src/utils/rescaler.h | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/3rdparty/libwebp/src/utils/rescaler.h b/src/3rdparty/libwebp/src/utils/rescaler.h index 8244cfe..98b01a7 100644 --- a/src/3rdparty/libwebp/src/utils/rescaler.h +++ b/src/3rdparty/libwebp/src/utils/rescaler.h @@ -20,9 +20,15 @@ extern "C" { #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 { +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 @@ -38,7 +44,7 @@ typedef struct { uint8_t* dst; int dst_stride; rescaler_t* irow, *frow; // work buffer -} WebPRescaler; +}; // Initialize a rescaler given scratch area 'work' and dimensions of src & dst. void WebPRescalerInit(WebPRescaler* const rescaler, @@ -48,6 +54,14 @@ void WebPRescalerInit(WebPRescaler* const rescaler, 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, @@ -60,10 +74,6 @@ int WebPRescalerImport(WebPRescaler* const rescaler, int num_rows, // Export as many rows as possible. Return the numbers of rows written. int WebPRescalerExport(WebPRescaler* const rescaler); -void WebPRescalerImportRow(WebPRescaler* const wrk, - const uint8_t* src); -// Export one row (starting at x_out position) from rescaler. -void WebPRescalerExportRow(WebPRescaler* const wrk); // Return true if input is finished static WEBP_INLINE |