libwebp: update to 0.5.0

This commit imports libwebp 0.5.0, including AUTHORS, COPYING, ChangeLog,
NEWS, PATENTS, README and src directories. In src, only includes header
and source files.

The patches required to build it in Qt will follow in separate
commit(s).

Change-Id: I96b4961ba63c75cc7fbab158c36a0f403f254c14
Reviewed-by: aavit <eirik.aavitsland@theqtcompany.com>

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