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Built SDL2_image and _mixer static

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This commit is contained in:
Alan Youngblood
2022-09-30 15:49:16 -04:00
parent e2605bf6c1
commit 1dec4347e0
4473 changed files with 1964551 additions and 9 deletions
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44
libsdl2_image/external/libwebp-1.0.2/extras/Makefile.am vendored Normal file
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libsdl2_image/external/libwebp-1.0.2/extras/Makefile.in vendored Normal file
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// Copyright 2015 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.
// -----------------------------------------------------------------------------
//
// Additional WebP utilities.
//
#include "extras/extras.h"
#include "webp/format_constants.h"
#include <assert.h>
#include <string.h>
#define XTRA_MAJ_VERSION 1
#define XTRA_MIN_VERSION 0
#define XTRA_REV_VERSION 2
//------------------------------------------------------------------------------
int WebPGetExtrasVersion(void) {
return (XTRA_MAJ_VERSION << 16) | (XTRA_MIN_VERSION << 8) | XTRA_REV_VERSION;
}
//------------------------------------------------------------------------------
int WebPImportGray(const uint8_t* gray_data, WebPPicture* pic) {
int y, width, uv_width;
if (pic == NULL || gray_data == NULL) return 0;
pic->colorspace = WEBP_YUV420;
if (!WebPPictureAlloc(pic)) return 0;
width = pic->width;
uv_width = (width + 1) >> 1;
for (y = 0; y < pic->height; ++y) {
memcpy(pic->y + y * pic->y_stride, gray_data, width);
gray_data += width; // <- we could use some 'data_stride' here if needed
if ((y & 1) == 0) {
memset(pic->u + (y >> 1) * pic->uv_stride, 128, uv_width);
memset(pic->v + (y >> 1) * pic->uv_stride, 128, uv_width);
}
}
return 1;
}
int WebPImportRGB565(const uint8_t* rgb565, WebPPicture* pic) {
int x, y;
uint32_t* dst;
if (pic == NULL || rgb565 == NULL) return 0;
pic->colorspace = WEBP_YUV420;
pic->use_argb = 1;
if (!WebPPictureAlloc(pic)) return 0;
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
const int width = pic->width;
for (x = 0; x < width; ++x) {
#ifdef WEBP_SWAP_16BIT_CSP
const uint32_t rg = rgb565[2 * x + 1];
const uint32_t gb = rgb565[2 * x + 0];
#else
const uint32_t rg = rgb565[2 * x + 0];
const uint32_t gb = rgb565[2 * x + 1];
#endif
uint32_t r = rg & 0xf8;
uint32_t g = ((rg << 5) | (gb >> 3)) & 0xfc;
uint32_t b = (gb << 5);
// dithering
r = r | (r >> 5);
g = g | (g >> 6);
b = b | (b >> 5);
dst[x] = (0xffu << 24) | (r << 16) | (g << 8) | b;
}
rgb565 += 2 * width;
dst += pic->argb_stride;
}
return 1;
}
int WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic) {
int x, y;
uint32_t* dst;
if (pic == NULL || rgb4444 == NULL) return 0;
pic->colorspace = WEBP_YUV420;
pic->use_argb = 1;
if (!WebPPictureAlloc(pic)) return 0;
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
const int width = pic->width;
for (x = 0; x < width; ++x) {
#ifdef WEBP_SWAP_16BIT_CSP
const uint32_t rg = rgb4444[2 * x + 1];
const uint32_t ba = rgb4444[2 * x + 0];
#else
const uint32_t rg = rgb4444[2 * x + 0];
const uint32_t ba = rgb4444[2 * x + 1];
#endif
uint32_t r = rg & 0xf0;
uint32_t g = (rg << 4);
uint32_t b = (ba & 0xf0);
uint32_t a = (ba << 4);
// dithering
r = r | (r >> 4);
g = g | (g >> 4);
b = b | (b >> 4);
a = a | (a >> 4);
dst[x] = (a << 24) | (r << 16) | (g << 8) | b;
}
rgb4444 += 2 * width;
dst += pic->argb_stride;
}
return 1;
}
int WebPImportColorMappedARGB(const uint8_t* indexed, int indexed_stride,
const uint32_t palette[], int palette_size,
WebPPicture* pic) {
int x, y;
uint32_t* dst;
// 256 as the input buffer is uint8_t.
assert(MAX_PALETTE_SIZE <= 256);
if (pic == NULL || indexed == NULL || indexed_stride < pic->width ||
palette == NULL || palette_size > MAX_PALETTE_SIZE || palette_size <= 0) {
return 0;
}
pic->use_argb = 1;
if (!WebPPictureAlloc(pic)) return 0;
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
for (x = 0; x < pic->width; ++x) {
// Make sure we are within the palette.
if (indexed[x] >= palette_size) {
WebPPictureFree(pic);
return 0;
}
dst[x] = palette[indexed[x]];
}
indexed += indexed_stride;
dst += pic->argb_stride;
}
return 1;
}
//------------------------------------------------------------------------------

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// Copyright 2015 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.
// -----------------------------------------------------------------------------
//
#ifndef WEBP_EXTRAS_EXTRAS_H_
#define WEBP_EXTRAS_EXTRAS_H_
#include "webp/types.h"
#ifdef __cplusplus
extern "C" {
#endif
#include "webp/encode.h"
#define WEBP_EXTRAS_ABI_VERSION 0x0001 // MAJOR(8b) + MINOR(8b)
//------------------------------------------------------------------------------
// Returns the version number of the extras library, packed in hexadecimal using
// 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
WEBP_EXTERN int WebPGetExtrasVersion(void);
//------------------------------------------------------------------------------
// Ad-hoc colorspace importers.
// Import luma sample (gray scale image) into 'picture'. The 'picture'
// width and height must be set prior to calling this function.
WEBP_EXTERN int WebPImportGray(const uint8_t* gray, WebPPicture* picture);
// Import rgb sample in RGB565 packed format into 'picture'. The 'picture'
// width and height must be set prior to calling this function.
WEBP_EXTERN int WebPImportRGB565(const uint8_t* rgb565, WebPPicture* pic);
// Import rgb sample in RGB4444 packed format into 'picture'. The 'picture'
// width and height must be set prior to calling this function.
WEBP_EXTERN int WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic);
// Import a color mapped image. The number of colors is less or equal to
// MAX_PALETTE_SIZE. 'pic' must have been initialized. Its content, if any,
// will be discarded. Returns 'false' in case of error, or if indexed[] contains
// invalid indices.
WEBP_EXTERN int
WebPImportColorMappedARGB(const uint8_t* indexed, int indexed_stride,
const uint32_t palette[], int palette_size,
WebPPicture* pic);
//------------------------------------------------------------------------------
// Parse a bitstream, search for VP8 (lossy) header and report a
// rough estimation of the quality factor used for compressing the bitstream.
// If the bitstream is in lossless format, the special value '101' is returned.
// Otherwise (lossy bitstream), the returned value is in the range [0..100].
// Any error (invalid bitstream, animated WebP, incomplete header, etc.)
// will return a value of -1.
WEBP_EXTERN int VP8EstimateQuality(const uint8_t* const data, size_t size);
//------------------------------------------------------------------------------
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_EXTRAS_EXTRAS_H_

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// Copyright 2016 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.
// -----------------------------------------------------------------------------
//
// Simple tool to load two webp/png/jpg/tiff files and compute PSNR/SSIM.
// This is mostly a wrapper around WebPPictureDistortion().
//
/*
gcc -o get_disto get_disto.c -O3 -I../ -L../examples -L../imageio \
-lexample_util -limageio_util -limagedec -lwebp -L/opt/local/lib \
-lpng -lz -ljpeg -ltiff -lm -lpthread
*/
//
// Author: Skal (pascal.massimino@gmail.com)
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "webp/encode.h"
#include "imageio/image_dec.h"
#include "imageio/imageio_util.h"
#include "../examples/unicode.h"
static size_t ReadPicture(const char* const filename, WebPPicture* const pic,
int keep_alpha) {
const uint8_t* data = NULL;
size_t data_size = 0;
WebPImageReader reader = NULL;
int ok = ImgIoUtilReadFile(filename, &data, &data_size);
if (!ok) goto End;
pic->use_argb = 1; // force ARGB
#ifdef HAVE_WINCODEC_H
// Try to decode the file using WIC falling back to the other readers for
// e.g., WebP.
ok = ReadPictureWithWIC(filename, pic, keep_alpha, NULL);
if (ok) goto End;
#endif
reader = WebPGuessImageReader(data, data_size);
ok = reader(data, data_size, pic, keep_alpha, NULL);
End:
if (!ok) {
WFPRINTF(stderr, "Error! Could not process file %s\n",
(const W_CHAR*)filename);
}
free((void*)data);
return ok ? data_size : 0;
}
static void RescalePlane(uint8_t* plane, int width, int height,
int x_stride, int y_stride, int max) {
const uint32_t factor = (max > 0) ? (255u << 16) / max : 0;
int x, y;
for (y = 0; y < height; ++y) {
uint8_t* const ptr = plane + y * y_stride;
for (x = 0; x < width * x_stride; x += x_stride) {
const uint32_t diff = (ptr[x] * factor + (1 << 15)) >> 16;
ptr[x] = diff;
}
}
}
// Return the max absolute difference.
static int DiffScaleChannel(uint8_t* src1, int stride1,
const uint8_t* src2, int stride2,
int x_stride, int w, int h, int do_scaling) {
int x, y;
int max = 0;
for (y = 0; y < h; ++y) {
uint8_t* const ptr1 = src1 + y * stride1;
const uint8_t* const ptr2 = src2 + y * stride2;
for (x = 0; x < w * x_stride; x += x_stride) {
const int diff = abs(ptr1[x] - ptr2[x]);
if (diff > max) max = diff;
ptr1[x] = diff;
}
}
if (do_scaling) RescalePlane(src1, w, h, x_stride, stride1, max);
return max;
}
//------------------------------------------------------------------------------
// SSIM calculation. We re-implement these functions here, out of dsp/, to avoid
// breaking the library's hidden visibility. This code duplication avoids the
// bigger annoyance of having to open up internal details of libdsp...
#define SSIM_KERNEL 3 // total size of the kernel: 2 * SSIM_KERNEL + 1
// struct for accumulating statistical moments
typedef struct {
uint32_t w; // sum(w_i) : sum of weights
uint32_t xm, ym; // sum(w_i * x_i), sum(w_i * y_i)
uint32_t xxm, xym, yym; // sum(w_i * x_i * x_i), etc.
} DistoStats;
// hat-shaped filter. Sum of coefficients is equal to 16.
static const uint32_t kWeight[2 * SSIM_KERNEL + 1] = { 1, 2, 3, 4, 3, 2, 1 };
static WEBP_INLINE double SSIMCalculation(const DistoStats* const stats) {
const uint32_t N = stats->w;
const uint32_t w2 = N * N;
const uint32_t C1 = 20 * w2;
const uint32_t C2 = 60 * w2;
const uint32_t C3 = 8 * 8 * w2; // 'dark' limit ~= 6
const uint64_t xmxm = (uint64_t)stats->xm * stats->xm;
const uint64_t ymym = (uint64_t)stats->ym * stats->ym;
if (xmxm + ymym >= C3) {
const int64_t xmym = (int64_t)stats->xm * stats->ym;
const int64_t sxy = (int64_t)stats->xym * N - xmym; // can be negative
const uint64_t sxx = (uint64_t)stats->xxm * N - xmxm;
const uint64_t syy = (uint64_t)stats->yym * N - ymym;
// we descale by 8 to prevent overflow during the fnum/fden multiply.
const uint64_t num_S = (2 * (uint64_t)(sxy < 0 ? 0 : sxy) + C2) >> 8;
const uint64_t den_S = (sxx + syy + C2) >> 8;
const uint64_t fnum = (2 * xmym + C1) * num_S;
const uint64_t fden = (xmxm + ymym + C1) * den_S;
const double r = (double)fnum / fden;
assert(r >= 0. && r <= 1.0);
return r;
}
return 1.; // area is too dark to contribute meaningfully
}
static double SSIMGetClipped(const uint8_t* src1, int stride1,
const uint8_t* src2, int stride2,
int xo, int yo, int W, int H) {
DistoStats stats = { 0, 0, 0, 0, 0, 0 };
const int ymin = (yo - SSIM_KERNEL < 0) ? 0 : yo - SSIM_KERNEL;
const int ymax = (yo + SSIM_KERNEL > H - 1) ? H - 1 : yo + SSIM_KERNEL;
const int xmin = (xo - SSIM_KERNEL < 0) ? 0 : xo - SSIM_KERNEL;
const int xmax = (xo + SSIM_KERNEL > W - 1) ? W - 1 : xo + SSIM_KERNEL;
int x, y;
src1 += ymin * stride1;
src2 += ymin * stride2;
for (y = ymin; y <= ymax; ++y, src1 += stride1, src2 += stride2) {
for (x = xmin; x <= xmax; ++x) {
const uint32_t w = kWeight[SSIM_KERNEL + x - xo]
* kWeight[SSIM_KERNEL + y - yo];
const uint32_t s1 = src1[x];
const uint32_t s2 = src2[x];
stats.w += w;
stats.xm += w * s1;
stats.ym += w * s2;
stats.xxm += w * s1 * s1;
stats.xym += w * s1 * s2;
stats.yym += w * s2 * s2;
}
}
return SSIMCalculation(&stats);
}
// Compute SSIM-score map. Return -1 in case of error, max diff otherwise.
static int SSIMScaleChannel(uint8_t* src1, int stride1,
const uint8_t* src2, int stride2,
int x_stride, int w, int h, int do_scaling) {
int x, y;
int max = 0;
uint8_t* const plane1 = (uint8_t*)malloc(2 * w * h * sizeof(*plane1));
uint8_t* const plane2 = plane1 + w * h;
if (plane1 == NULL) return -1;
// extract plane
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
plane1[x + y * w] = src1[x * x_stride + y * stride1];
plane2[x + y * w] = src2[x * x_stride + y * stride2];
}
}
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
const double ssim = SSIMGetClipped(plane1, w, plane2, w, x, y, w, h);
int diff = (int)(255 * (1. - ssim));
if (diff < 0) {
diff = 0;
} else if (diff > max) {
max = diff;
}
src1[x * x_stride + y * stride1] = (diff > 255) ? 255u : (uint8_t)diff;
}
}
free(plane1);
if (do_scaling) RescalePlane(src1, w, h, x_stride, stride1, max);
return max;
}
// Convert an argb picture to luminance.
static void ConvertToGray(WebPPicture* const pic) {
int x, y;
assert(pic != NULL);
assert(pic->use_argb);
for (y = 0; y < pic->height; ++y) {
uint32_t* const row = &pic->argb[y * pic->argb_stride];
for (x = 0; x < pic->width; ++x) {
const uint32_t argb = row[x];
const uint32_t r = (argb >> 16) & 0xff;
const uint32_t g = (argb >> 8) & 0xff;
const uint32_t b = (argb >> 0) & 0xff;
// We use BT.709 for converting to luminance.
const uint32_t Y = (uint32_t)(0.2126 * r + 0.7152 * g + 0.0722 * b + .5);
row[x] = (argb & 0xff000000u) | (Y * 0x010101u);
}
}
}
static void Help(void) {
fprintf(stderr,
"Usage: get_disto [-ssim][-psnr][-alpha] compressed.webp orig.webp\n"
" -ssim ..... print SSIM distortion\n"
" -psnr ..... print PSNR distortion (default)\n"
" -alpha .... preserve alpha plane\n"
" -h ........ this message\n"
" -o <file> . save the diff map as a WebP lossless file\n"
" -scale .... scale the difference map to fit [0..255] range\n"
" -gray ..... use grayscale for difference map (-scale)\n"
" Also handles PNG, JPG and TIFF files, in addition to WebP.\n");
}
int main(int argc, const char *argv[]) {
WebPPicture pic1, pic2;
size_t size1 = 0, size2 = 0;
int ret = 1;
float disto[5];
int type = 0;
int c;
int help = 0;
int keep_alpha = 0;
int scale = 0;
int use_gray = 0;
const char* name1 = NULL;
const char* name2 = NULL;
const char* output = NULL;
INIT_WARGV(argc, argv);
if (!WebPPictureInit(&pic1) || !WebPPictureInit(&pic2)) {
fprintf(stderr, "Can't init pictures\n");
FREE_WARGV_AND_RETURN(1);
}
for (c = 1; c < argc; ++c) {
if (!strcmp(argv[c], "-ssim")) {
type = 1;
} else if (!strcmp(argv[c], "-psnr")) {
type = 0;
} else if (!strcmp(argv[c], "-alpha")) {
keep_alpha = 1;
} else if (!strcmp(argv[c], "-scale")) {
scale = 1;
} else if (!strcmp(argv[c], "-gray")) {
use_gray = 1;
} else if (!strcmp(argv[c], "-h")) {
help = 1;
ret = 0;
} else if (!strcmp(argv[c], "-o")) {
if (++c == argc) {
fprintf(stderr, "missing file name after %s option.\n", argv[c - 1]);
goto End;
}
output = (const char*)GET_WARGV(argv, c);
} else if (name1 == NULL) {
name1 = (const char*)GET_WARGV(argv, c);
} else {
name2 = (const char*)GET_WARGV(argv, c);
}
}
if (help || name1 == NULL || name2 == NULL) {
if (!help) {
fprintf(stderr, "Error: missing arguments.\n");
}
Help();
goto End;
}
size1 = ReadPicture(name1, &pic1, 1);
size2 = ReadPicture(name2, &pic2, 1);
if (size1 == 0 || size2 == 0) goto End;
if (!keep_alpha) {
WebPBlendAlpha(&pic1, 0x00000000);
WebPBlendAlpha(&pic2, 0x00000000);
}
if (!WebPPictureDistortion(&pic1, &pic2, type, disto)) {
fprintf(stderr, "Error while computing the distortion.\n");
goto End;
}
printf("%u %.2f %.2f %.2f %.2f %.2f [ %.2f bpp ]\n",
(unsigned int)size1,
disto[4], disto[0], disto[1], disto[2], disto[3],
8.f * size1 / pic1.width / pic1.height);
if (output != NULL) {
uint8_t* data = NULL;
size_t data_size = 0;
if (pic1.use_argb != pic2.use_argb) {
fprintf(stderr, "Pictures are not in the same argb format. "
"Can't save the difference map.\n");
goto End;
}
if (pic1.use_argb) {
int n;
fprintf(stderr, "max differences per channel: ");
for (n = 0; n < 3; ++n) { // skip the alpha channel
const int range = (type == 1) ?
SSIMScaleChannel((uint8_t*)pic1.argb + n, pic1.argb_stride * 4,
(const uint8_t*)pic2.argb + n, pic2.argb_stride * 4,
4, pic1.width, pic1.height, scale) :
DiffScaleChannel((uint8_t*)pic1.argb + n, pic1.argb_stride * 4,
(const uint8_t*)pic2.argb + n, pic2.argb_stride * 4,
4, pic1.width, pic1.height, scale);
if (range < 0) fprintf(stderr, "\nError computing diff map\n");
fprintf(stderr, "[%d]", range);
}
fprintf(stderr, "\n");
if (use_gray) ConvertToGray(&pic1);
} else {
fprintf(stderr, "Can only compute the difference map in ARGB format.\n");
goto End;
}
#if !defined(WEBP_REDUCE_CSP)
data_size = WebPEncodeLosslessBGRA((const uint8_t*)pic1.argb,
pic1.width, pic1.height,
pic1.argb_stride * 4,
&data);
if (data_size == 0) {
fprintf(stderr, "Error during lossless encoding.\n");
goto End;
}
ret = ImgIoUtilWriteFile(output, data, data_size) ? 0 : 1;
WebPFree(data);
if (ret) goto End;
#else
(void)data;
(void)data_size;
fprintf(stderr, "Cannot save the difference map. Please recompile "
"without the WEBP_REDUCE_CSP flag.\n");
#endif // WEBP_REDUCE_CSP
}
ret = 0;
End:
WebPPictureFree(&pic1);
WebPPictureFree(&pic2);
FREE_WARGV_AND_RETURN(ret);
}

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// Copyright 2016 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.
// -----------------------------------------------------------------------------
//
// VP8EstimateQuality(): rough encoding quality estimate
//
// Author: Skal (pascal.massimino@gmail.com)
#include "extras/extras.h"
#include "webp/decode.h"
#include <math.h>
//------------------------------------------------------------------------------
#define INVALID_BIT_POS (1ull << 63)
// In most cases, we don't need to use a full arithmetic decoder, since
// all the header's bits are written using a uniform probability of 128.
// We can just parse the header as if it was bits (works in 99.999% cases).
static WEBP_INLINE uint32_t GetBit(const uint8_t* const data, size_t nb,
uint64_t max_size, uint64_t* const bit_pos) {
uint32_t val = 0;
if (*bit_pos + nb <= 8 * max_size) {
while (nb-- > 0) {
const uint64_t p = (*bit_pos)++;
const int bit = !!(data[p >> 3] & (128 >> ((p & 7))));
val = (val << 1) | bit;
}
} else {
*bit_pos = INVALID_BIT_POS;
}
return val;
}
#define GET_BIT(n) GetBit(data, (n), size, &bit_pos)
#define CONDITIONAL_SKIP(n) (GET_BIT(1) ? GET_BIT((n)) : 0)
int VP8EstimateQuality(const uint8_t* const data, size_t size) {
size_t pos = 0;
uint64_t bit_pos;
uint64_t sig = 0x00;
int ok = 0;
int Q = -1;
WebPBitstreamFeatures features;
if (data == NULL) return -1;
if (WebPGetFeatures(data, size, &features) != VP8_STATUS_OK) {
return -1; // invalid file
}
if (features.format == 2) return 101; // lossless
if (features.format == 0 || features.has_animation) return -1; // mixed
while (pos < size) {
sig = (sig >> 8) | ((uint64_t)data[pos++] << 40);
if ((sig >> 24) == 0x2a019dull) {
ok = 1;
break;
}
}
if (!ok) return -1;
if (pos + 4 > size) return -1;
// Skip main Header
// width = (data[pos + 0] | (data[pos + 1] << 8)) & 0x3fff;
// height = (data[pos + 2] | (data[pos + 3] << 8)) & 0x3fff;
pos += 4;
bit_pos = pos * 8;
GET_BIT(2); // colorspace + clamp type
// Segment header
if (GET_BIT(1)) { // use_segment_
int s;
const int update_map = GET_BIT(1);
if (GET_BIT(1)) { // update data
const int absolute_delta = GET_BIT(1);
int q[4] = { 0, 0, 0, 0 };
for (s = 0; s < 4; ++s) {
if (GET_BIT(1)) {
q[s] = GET_BIT(7);
if (GET_BIT(1)) q[s] = -q[s]; // sign
}
}
if (absolute_delta) Q = q[0]; // just use the first segment's quantizer
for (s = 0; s < 4; ++s) CONDITIONAL_SKIP(7); // filter strength
}
if (update_map) {
for (s = 0; s < 3; ++s) CONDITIONAL_SKIP(8);
}
}
// Filter header
GET_BIT(1 + 6 + 3); // simple + level + sharpness
if (GET_BIT(1)) { // use_lf_delta
if (GET_BIT(1)) { // update lf_delta?
int n;
for (n = 0; n < 4 + 4; ++n) CONDITIONAL_SKIP(6);
}
}
// num partitions
GET_BIT(2);
// ParseQuant
{
const int base_q = GET_BIT(7);
/* dqy1_dc = */ CONDITIONAL_SKIP(5);
/* dqy2_dc = */ CONDITIONAL_SKIP(5);
/* dqy2_ac = */ CONDITIONAL_SKIP(5);
/* dquv_dc = */ CONDITIONAL_SKIP(5);
/* dquv_ac = */ CONDITIONAL_SKIP(5);
if (Q < 0) Q = base_q;
}
if (bit_pos == INVALID_BIT_POS) return -1;
// base mapping
Q = (127 - Q) * 100 / 127;
// correction for power-law behavior in low range
if (Q < 80) {
Q = (int)(pow(Q / 80., 1. / 0.38) * 80);
}
return Q;
}

101
libsdl2_image/external/libwebp-1.0.2/extras/vwebp_sdl.c vendored Normal file
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// Copyright 2017 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.
// -----------------------------------------------------------------------------
//
// Simple SDL-based WebP file viewer.
// Does not support animation, just static images.
//
// Press 'q' to exit.
//
// Author: James Zern (jzern@google.com)
#include <stdio.h>
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#if defined(WEBP_HAVE_SDL)
#include "webp_to_sdl.h"
#include "webp/decode.h"
#include "imageio/imageio_util.h"
#include "../examples/unicode.h"
#if defined(WEBP_HAVE_JUST_SDL_H)
#include <SDL.h>
#else
#include <SDL/SDL.h>
#endif
static void ProcessEvents(void) {
int done = 0;
SDL_Event event;
while (!done && SDL_WaitEvent(&event)) {
switch (event.type) {
case SDL_KEYUP:
switch (event.key.keysym.sym) {
case SDLK_q: done = 1; break;
default: break;
}
break;
default: break;
}
}
}
int main(int argc, char* argv[]) {
int c;
int ok = 0;
INIT_WARGV(argc, argv);
for (c = 1; c < argc; ++c) {
const char* file = NULL;
const uint8_t* webp = NULL;
size_t webp_size = 0;
if (!strcmp(argv[c], "-h")) {
printf("Usage: %s [-h] image.webp [more_files.webp...]\n", argv[0]);
FREE_WARGV_AND_RETURN(0);
} else {
file = (const char*)GET_WARGV(argv, c);
}
if (file == NULL) continue;
if (!ImgIoUtilReadFile(file, &webp, &webp_size)) {
WFPRINTF(stderr, "Error opening file: %s\n", (const W_CHAR*)file);
goto Error;
}
if (webp_size != (size_t)(int)webp_size) {
free((void*)webp);
fprintf(stderr, "File too large.\n");
goto Error;
}
ok = WebpToSDL((const char*)webp, (int)webp_size);
free((void*)webp);
if (!ok) {
WFPRINTF(stderr, "Error decoding file %s\n", (const W_CHAR*)file);
goto Error;
}
ProcessEvents();
}
ok = 1;
Error:
SDL_Quit();
FREE_WARGV_AND_RETURN(ok ? 0 : 1);
}
#else // !WEBP_HAVE_SDL
int main(int argc, const char *argv[]) {
fprintf(stderr, "SDL support not enabled in %s.\n", argv[0]);
(void)argc;
return 0;
}
#endif

54
libsdl2_image/external/libwebp-1.0.2/extras/webp_quality.c vendored Normal file
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// Simple tool to roughly evaluate the quality encoding of a webp bitstream
//
// Result is a *rough* estimation of the quality. You should just consider
// the bucket it's in (q > 80? > 50? > 20?) and not take it for face value.
/*
gcc -o webp_quality webp_quality.c -O3 -I../ -L. -L../imageio \
-limageio_util -lwebpextras -lwebp -lm -lpthread
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "extras/extras.h"
#include "imageio/imageio_util.h"
#include "../examples/unicode.h"
int main(int argc, const char *argv[]) {
int c;
int quiet = 0;
int ok = 1;
INIT_WARGV(argc, argv);
for (c = 1; ok && c < argc; ++c) {
if (!strcmp(argv[c], "-quiet")) {
quiet = 1;
} else if (!strcmp(argv[c], "-help") || !strcmp(argv[c], "-h")) {
printf("webp_quality [-h][-quiet] webp_files...\n");
FREE_WARGV_AND_RETURN(0);
} else {
const char* const filename = (const char*)GET_WARGV(argv, c);
const uint8_t* data = NULL;
size_t data_size = 0;
int q;
ok = ImgIoUtilReadFile(filename, &data, &data_size);
if (!ok) break;
q = VP8EstimateQuality(data, data_size);
if (!quiet) WPRINTF("[%s] ", (const W_CHAR*)filename);
if (q < 0) {
fprintf(stderr, "Not a WebP file, or not a lossy WebP file.\n");
ok = 0;
} else {
if (!quiet) {
printf("Estimated quality factor: %d\n", q);
} else {
printf("%d\n", q); // just print the number
}
}
free((void*)data);
}
}
FREE_WARGV_AND_RETURN(ok ? 0 : 1);
}

110
libsdl2_image/external/libwebp-1.0.2/extras/webp_to_sdl.c vendored Normal file
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// Copyright 2017 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.
// -----------------------------------------------------------------------------
//
// Simple WebP-to-SDL wrapper. Useful for emscripten.
//
// Author: James Zern (jzern@google.com)
#ifdef HAVE_CONFIG_H
#include "src/webp/config.h"
#endif
#if defined(WEBP_HAVE_SDL)
#include "webp_to_sdl.h"
#include <stdio.h>
#include "src/webp/decode.h"
#if defined(WEBP_HAVE_JUST_SDL_H)
#include <SDL.h>
#else
#include <SDL/SDL.h>
#endif
static int init_ok = 0;
int WebpToSDL(const char* data, unsigned int data_size) {
int ok = 0;
VP8StatusCode status;
WebPDecoderConfig config;
WebPBitstreamFeatures* const input = &config.input;
WebPDecBuffer* const output = &config.output;
SDL_Surface* screen = NULL;
SDL_Surface* surface = NULL;
if (!WebPInitDecoderConfig(&config)) {
fprintf(stderr, "Library version mismatch!\n");
return 0;
}
if (!init_ok) {
SDL_Init(SDL_INIT_VIDEO);
init_ok = 1;
}
status = WebPGetFeatures((uint8_t*)data, (size_t)data_size, &config.input);
if (status != VP8_STATUS_OK) goto Error;
screen = SDL_SetVideoMode(input->width, input->height, 32, SDL_SWSURFACE);
if (screen == NULL) {
fprintf(stderr, "Unable to set video mode (32bpp %dx%d)!\n",
input->width, input->height);
goto Error;
}
surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
input->width, input->height, 32,
0x000000ffu, // R mask
0x0000ff00u, // G mask
0x00ff0000u, // B mask
0xff000000u); // A mask
if (surface == NULL) {
fprintf(stderr, "Unable to create %dx%d RGBA surface!\n",
input->width, input->height);
goto Error;
}
if (SDL_MUSTLOCK(surface)) SDL_LockSurface(surface);
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
output->colorspace = MODE_BGRA;
#else
output->colorspace = MODE_RGBA;
#endif
output->width = surface->w;
output->height = surface->h;
output->u.RGBA.rgba = surface->pixels;
output->u.RGBA.stride = surface->pitch;
output->u.RGBA.size = surface->pitch * surface->h;
output->is_external_memory = 1;
status = WebPDecode((const uint8_t*)data, (size_t)data_size, &config);
if (status != VP8_STATUS_OK) {
fprintf(stderr, "Error decoding image (%d)\n", status);
goto Error;
}
if (SDL_MUSTLOCK(surface)) SDL_UnlockSurface(surface);
if (SDL_BlitSurface(surface, NULL, screen, NULL) ||
SDL_Flip(screen)) {
goto Error;
}
ok = 1;
Error:
SDL_FreeSurface(surface);
SDL_FreeSurface(screen);
WebPFreeDecBuffer(output);
return ok;
}
//------------------------------------------------------------------------------
#endif // WEBP_HAVE_SDL

22
libsdl2_image/external/libwebp-1.0.2/extras/webp_to_sdl.h vendored Normal file
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// Copyright 2017 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.
// -----------------------------------------------------------------------------
//
// Simple WebP-to-SDL wrapper. Useful for emscripten.
//
// Author: James Zern (jzern@google.com)
#ifndef WEBP_EXTRAS_WEBP_TO_SDL_H_
#define WEBP_EXTRAS_WEBP_TO_SDL_H_
// Exports the method WebpToSDL(const char* data, int data_size) which decodes
// a WebP bitstream into an RGBA SDL surface.
// Return false on failure.
extern int WebpToSDL(const char* data, unsigned int data_size);
#endif // WEBP_EXTRAS_WEBP_TO_SDL_H_