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libwebp/imageio/image_enc.c
Vincent Rabaud 433c7dca11 Fix static analyzer warnings. 
Change-Id: I45f0db2310b1188809963af93240e3d438f807b8
2023-09-14 22:43:45 +02:00

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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.
// -----------------------------------------------------------------------------
//
// Save image
#include "./image_enc.h"
#include <assert.h>
#include <string.h>
#ifdef WEBP_HAVE_PNG
#include <png.h>
#include <setjmp.h> // note: this must be included *after* png.h
#endif
#ifdef HAVE_WINCODEC_H
#ifdef __MINGW32__
#define INITGUID // Without this GUIDs are declared extern and fail to link
#endif
#define CINTERFACE
#define COBJMACROS
#define _WIN32_IE 0x500 // Workaround bug in shlwapi.h when compiling C++
// code with COBJMACROS.
#include <ole2.h> // CreateStreamOnHGlobal()
#include <shlwapi.h>
#include <tchar.h>
#include <windows.h>
#include <wincodec.h>
#endif
#include "./imageio_util.h"
#include "../examples/unicode.h"
//------------------------------------------------------------------------------
// PNG
#ifdef HAVE_WINCODEC_H
#define IFS(fn) \
do { \
if (SUCCEEDED(hr)) { \
hr = (fn); \
if (FAILED(hr)) fprintf(stderr, #fn " failed %08lx\n", hr); \
} \
} while (0)
#ifdef __cplusplus
#define MAKE_REFGUID(x) (x)
#else
#define MAKE_REFGUID(x) &(x)
#endif
static HRESULT CreateOutputStream(const char* out_file_name,
int write_to_mem, IStream** stream) {
HRESULT hr = S_OK;
if (write_to_mem) {
// Output to a memory buffer. This is freed when 'stream' is released.
IFS(CreateStreamOnHGlobal(NULL, TRUE, stream));
} else {
IFS(SHCreateStreamOnFile((const LPTSTR)out_file_name,
STGM_WRITE | STGM_CREATE, stream));
}
if (FAILED(hr)) {
_ftprintf(stderr, _T("Error opening output file %s (%08lx)\n"),
(const LPTSTR)out_file_name, hr);
}
return hr;
}
static HRESULT WriteUsingWIC(const char* out_file_name, int use_stdout,
REFGUID container_guid,
uint8_t* rgb, int stride,
uint32_t width, uint32_t height, int has_alpha) {
HRESULT hr = S_OK;
IWICImagingFactory* factory = NULL;
IWICBitmapFrameEncode* frame = NULL;
IWICBitmapEncoder* encoder = NULL;
IStream* stream = NULL;
WICPixelFormatGUID pixel_format = has_alpha ? GUID_WICPixelFormat32bppBGRA
: GUID_WICPixelFormat24bppBGR;
if (out_file_name == NULL || rgb == NULL) return E_INVALIDARG;
IFS(CoInitialize(NULL));
IFS(CoCreateInstance(MAKE_REFGUID(CLSID_WICImagingFactory), NULL,
CLSCTX_INPROC_SERVER,
MAKE_REFGUID(IID_IWICImagingFactory),
(LPVOID*)&factory));
if (hr == REGDB_E_CLASSNOTREG) {
fprintf(stderr,
"Couldn't access Windows Imaging Component (are you running "
"Windows XP SP3 or newer?). PNG support not available. "
"Use -ppm or -pgm for available PPM and PGM formats.\n");
}
IFS(CreateOutputStream(out_file_name, use_stdout, &stream));
IFS(IWICImagingFactory_CreateEncoder(factory, container_guid, NULL,
&encoder));
IFS(IWICBitmapEncoder_Initialize(encoder, stream,
WICBitmapEncoderNoCache));
IFS(IWICBitmapEncoder_CreateNewFrame(encoder, &frame, NULL));
IFS(IWICBitmapFrameEncode_Initialize(frame, NULL));
IFS(IWICBitmapFrameEncode_SetSize(frame, width, height));
IFS(IWICBitmapFrameEncode_SetPixelFormat(frame, &pixel_format));
IFS(IWICBitmapFrameEncode_WritePixels(frame, height, stride,
height * stride, rgb));
IFS(IWICBitmapFrameEncode_Commit(frame));
IFS(IWICBitmapEncoder_Commit(encoder));
if (SUCCEEDED(hr) && use_stdout) {
HGLOBAL image;
IFS(GetHGlobalFromStream(stream, &image));
if (SUCCEEDED(hr)) {
HANDLE std_output = GetStdHandle(STD_OUTPUT_HANDLE);
DWORD mode;
const BOOL update_mode = GetConsoleMode(std_output, &mode);
const void* const image_mem = GlobalLock(image);
DWORD bytes_written = 0;
// Clear output processing if necessary, then output the image.
if (update_mode) SetConsoleMode(std_output, 0);
if (!WriteFile(std_output, image_mem, (DWORD)GlobalSize(image),
&bytes_written, NULL) ||
bytes_written != GlobalSize(image)) {
hr = E_FAIL;
}
if (update_mode) SetConsoleMode(std_output, mode);
GlobalUnlock(image);
}
}
if (frame != NULL) IUnknown_Release(frame);
if (encoder != NULL) IUnknown_Release(encoder);
if (factory != NULL) IUnknown_Release(factory);
if (stream != NULL) IUnknown_Release(stream);
return hr;
}
int WebPWritePNG(const char* out_file_name, int use_stdout,
const WebPDecBuffer* const buffer) {
const uint32_t width = buffer->width;
const uint32_t height = buffer->height;
uint8_t* const rgb = buffer->u.RGBA.rgba;
const int stride = buffer->u.RGBA.stride;
const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
return SUCCEEDED(WriteUsingWIC(out_file_name, use_stdout,
MAKE_REFGUID(GUID_ContainerFormatPng),
rgb, stride, width, height, has_alpha));
}
#elif defined(WEBP_HAVE_PNG) // !HAVE_WINCODEC_H
static void PNGAPI PNGErrorFunction(png_structp png, png_const_charp unused) {
(void)unused; // remove variable-unused warning
longjmp(png_jmpbuf(png), 1);
}
int WebPWritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
volatile png_structp png;
volatile png_infop info;
if (out_file == NULL || buffer == NULL) return 0;
png = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, PNGErrorFunction, NULL);
if (png == NULL) {
return 0;
}
info = png_create_info_struct(png);
if (info == NULL) {
png_destroy_write_struct((png_structpp)&png, NULL);
return 0;
}
if (setjmp(png_jmpbuf(png))) {
png_destroy_write_struct((png_structpp)&png, (png_infopp)&info);
return 0;
}
png_init_io(png, out_file);
{
const uint32_t width = buffer->width;
const uint32_t height = buffer->height;
png_bytep row = buffer->u.RGBA.rgba;
const int stride = buffer->u.RGBA.stride;
const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
uint32_t y;
png_set_IHDR(png, info, width, height, 8,
has_alpha ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_write_info(png, info);
for (y = 0; y < height; ++y) {
png_write_rows(png, &row, 1);
row += stride;
}
}
png_write_end(png, info);
png_destroy_write_struct((png_structpp)&png, (png_infopp)&info);
return 1;
}
#else // !HAVE_WINCODEC_H && !WEBP_HAVE_PNG
int WebPWritePNG(FILE* fout, const WebPDecBuffer* const buffer) {
if (fout == NULL || buffer == NULL) return 0;
fprintf(stderr, "PNG support not compiled. Please install the libpng "
"development package before building.\n");
fprintf(stderr, "You can run with -ppm flag to decode in PPM format.\n");
return 0;
}
#endif
//------------------------------------------------------------------------------
// PPM / PAM
static int WritePPMPAM(FILE* fout, const WebPDecBuffer* const buffer,
int alpha) {
if (fout == NULL || buffer == NULL) {
return 0;
} else {
const uint32_t width = buffer->width;
const uint32_t height = buffer->height;
const uint8_t* row = buffer->u.RGBA.rgba;
const int stride = buffer->u.RGBA.stride;
const size_t bytes_per_px = alpha ? 4 : 3;
uint32_t y;
if (row == NULL) return 0;
if (alpha) {
fprintf(fout, "P7\nWIDTH %u\nHEIGHT %u\nDEPTH 4\nMAXVAL 255\n"
"TUPLTYPE RGB_ALPHA\nENDHDR\n", width, height);
} else {
fprintf(fout, "P6\n%u %u\n255\n", width, height);
}
for (y = 0; y < height; ++y) {
if (fwrite(row, width, bytes_per_px, fout) != bytes_per_px) {
return 0;
}
row += stride;
}
}
return 1;
}
int WebPWritePPM(FILE* fout, const WebPDecBuffer* const buffer) {
return WritePPMPAM(fout, buffer, 0);
}
int WebPWritePAM(FILE* fout, const WebPDecBuffer* const buffer) {
return WritePPMPAM(fout, buffer, 1);
}
//------------------------------------------------------------------------------
// Raw PGM
// Save 16b mode (RGBA4444, RGB565, ...) for debugging purpose.
int WebPWrite16bAsPGM(FILE* fout, const WebPDecBuffer* const buffer) {
uint32_t width, height;
uint8_t* rgba;
int stride;
const uint32_t bytes_per_px = 2;
uint32_t y;
if (fout == NULL || buffer == NULL) return 0;
width = buffer->width;
height = buffer->height;
rgba = buffer->u.RGBA.rgba;
stride = buffer->u.RGBA.stride;
if (rgba == NULL) return 0;
fprintf(fout, "P5\n%u %u\n255\n", width * bytes_per_px, height);
for (y = 0; y < height; ++y) {
if (fwrite(rgba, width, bytes_per_px, fout) != bytes_per_px) {
return 0;
}
rgba += stride;
}
return 1;
}
//------------------------------------------------------------------------------
// BMP (see https://en.wikipedia.org/wiki/BMP_file_format#Pixel_storage)
static void PutLE16(uint8_t* const dst, uint32_t value) {
dst[0] = (value >> 0) & 0xff;
dst[1] = (value >> 8) & 0xff;
}
static void PutLE32(uint8_t* const dst, uint32_t value) {
PutLE16(dst + 0, (value >> 0) & 0xffff);
PutLE16(dst + 2, (value >> 16) & 0xffff);
}
#define BMP_HEADER_SIZE 54
#define BMP_HEADER_ALPHA_EXTRA_SIZE 16 // for alpha info
int WebPWriteBMP(FILE* fout, const WebPDecBuffer* const buffer) {
int has_alpha, header_size;
uint32_t width, height;
uint8_t* rgba;
int stride;
uint32_t y;
uint32_t bytes_per_px, line_size, image_size, bmp_stride, total_size;
uint8_t bmp_header[BMP_HEADER_SIZE + BMP_HEADER_ALPHA_EXTRA_SIZE] = { 0 };
if (fout == NULL || buffer == NULL) return 0;
has_alpha = WebPIsAlphaMode(buffer->colorspace);
header_size = BMP_HEADER_SIZE + (has_alpha ? BMP_HEADER_ALPHA_EXTRA_SIZE : 0);
width = buffer->width;
height = buffer->height;
rgba = buffer->u.RGBA.rgba;
stride = buffer->u.RGBA.stride;
bytes_per_px = has_alpha ? 4 : 3;
line_size = bytes_per_px * width;
bmp_stride = (line_size + 3) & ~3; // pad to 4
image_size = bmp_stride * height;
total_size = image_size + header_size;
if (rgba == NULL) return 0;
// bitmap file header
PutLE16(bmp_header + 0, 0x4d42); // signature 'BM'
PutLE32(bmp_header + 2, total_size); // size including header
PutLE32(bmp_header + 6, 0); // reserved
PutLE32(bmp_header + 10, header_size); // offset to pixel array
// bitmap info header
PutLE32(bmp_header + 14, header_size - 14); // DIB header size
PutLE32(bmp_header + 18, width); // dimensions
PutLE32(bmp_header + 22, height); // no vertical flip
PutLE16(bmp_header + 26, 1); // number of planes
PutLE16(bmp_header + 28, bytes_per_px * 8); // bits per pixel
PutLE32(bmp_header + 30, has_alpha ? 3 : 0); // BI_BITFIELDS or BI_RGB
PutLE32(bmp_header + 34, image_size);
PutLE32(bmp_header + 38, 2400); // x pixels/meter
PutLE32(bmp_header + 42, 2400); // y pixels/meter
PutLE32(bmp_header + 46, 0); // number of palette colors
PutLE32(bmp_header + 50, 0); // important color count
if (has_alpha) { // BITMAPV3INFOHEADER complement
PutLE32(bmp_header + 54, 0x00ff0000); // red mask
PutLE32(bmp_header + 58, 0x0000ff00); // green mask
PutLE32(bmp_header + 62, 0x000000ff); // blue mask
PutLE32(bmp_header + 66, 0xff000000); // alpha mask
}
// TODO(skal): color profile
// write header
if (fwrite(bmp_header, header_size, 1, fout) != 1) {
return 0;
}
// write pixel array, bottom to top
for (y = 0; y < height; ++y) {
const uint8_t* const src = &rgba[(uint64_t)(height - 1 - y) * stride];
if (fwrite(src, line_size, 1, fout) != 1) {
return 0;
}
// write padding zeroes
if (bmp_stride != line_size) {
const uint8_t zeroes[3] = { 0 };
if (fwrite(zeroes, bmp_stride - line_size, 1, fout) != 1) {
return 0;
}
}
}
return 1;
}
#undef BMP_HEADER_SIZE
#undef BMP_HEADER_ALPHA_EXTRA_SIZE
//------------------------------------------------------------------------------
// TIFF
#define NUM_IFD_ENTRIES 15
#define EXTRA_DATA_SIZE 16
// 10b for signature/header + n * 12b entries + 4b for IFD terminator:
#define EXTRA_DATA_OFFSET (10 + 12 * NUM_IFD_ENTRIES + 4)
#define TIFF_HEADER_SIZE (EXTRA_DATA_OFFSET + EXTRA_DATA_SIZE)
int WebPWriteTIFF(FILE* fout, const WebPDecBuffer* const buffer) {
int has_alpha;
uint32_t width, height;
uint8_t* rgba;
int stride;
uint8_t bytes_per_px = 0;
const uint8_t assoc_alpha = 0;
// For non-alpha case, we omit tag 0x152 (ExtraSamples).
const uint8_t num_ifd_entries = 0;
uint8_t tiff_header[TIFF_HEADER_SIZE] = {
0x49, 0x49, 0x2a, 0x00, // little endian signature
8, 0, 0, 0, // offset to the unique IFD that follows
// IFD (offset = 8). Entries must be written in increasing tag order.
num_ifd_entries, 0, // Number of entries in the IFD (12 bytes each).
0x00, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 10: Width (TBD)
0x01, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 22: Height (TBD)
0x02, 0x01, 3, 0, bytes_per_px, 0, 0, 0, // 34: BitsPerSample: 8888
EXTRA_DATA_OFFSET + 0, 0, 0, 0,
0x03, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 46: Compression: none
0x06, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0, // 58: Photometric: RGB
0x11, 0x01, 4, 0, 1, 0, 0, 0, // 70: Strips offset:
TIFF_HEADER_SIZE, 0, 0, 0, // data follows header
0x12, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 82: Orientation: topleft
0x15, 0x01, 3, 0, 1, 0, 0, 0, // 94: SamplesPerPixels
bytes_per_px, 0, 0, 0,
0x16, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 106: Rows per strip (TBD)
0x17, 0x01, 4, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 118: StripByteCount (TBD)
0x1a, 0x01, 5, 0, 1, 0, 0, 0, // 130: X-resolution
EXTRA_DATA_OFFSET + 8, 0, 0, 0,
0x1b, 0x01, 5, 0, 1, 0, 0, 0, // 142: Y-resolution
EXTRA_DATA_OFFSET + 8, 0, 0, 0,
0x1c, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 154: PlanarConfiguration
0x28, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0, // 166: ResolutionUnit (inch)
0x52, 0x01, 3, 0, 1, 0, 0, 0,
assoc_alpha, 0, 0, 0, // 178: ExtraSamples: rgbA/RGBA
0, 0, 0, 0, // 190: IFD terminator
// EXTRA_DATA_OFFSET:
8, 0, 8, 0, 8, 0, 8, 0, // BitsPerSample
72, 0, 0, 0, 1, 0, 0, 0 // 72 pixels/inch, for X/Y-resolution
};
uint32_t y;
if (fout == NULL || buffer == NULL) return 0;
has_alpha = WebPIsAlphaMode(buffer->colorspace);
width = buffer->width;
height = buffer->height;
rgba = buffer->u.RGBA.rgba;
stride = buffer->u.RGBA.stride;
if (rgba == NULL) return 0;
// Update bytes_per_px, num_ifd_entries and assoc_alpha.
tiff_header[38] = tiff_header[102] = bytes_per_px = has_alpha ? 4 : 3;
tiff_header[8] = has_alpha ? NUM_IFD_ENTRIES : NUM_IFD_ENTRIES - 1;
tiff_header[186] = WebPIsPremultipliedMode(buffer->colorspace) ? 1 : 2;
// Fill placeholders in IFD:
PutLE32(tiff_header + 10 + 8, width);
PutLE32(tiff_header + 22 + 8, height);
PutLE32(tiff_header + 106 + 8, height);
PutLE32(tiff_header + 118 + 8, width * bytes_per_px * height);
if (!has_alpha) PutLE32(tiff_header + 178, 0); // IFD terminator
// write header
if (fwrite(tiff_header, sizeof(tiff_header), 1, fout) != 1) {
return 0;
}
// write pixel values
for (y = 0; y < height; ++y) {
if (fwrite(rgba, bytes_per_px, width, fout) != width) {
return 0;
}
rgba += stride;
}
return 1;
}
#undef TIFF_HEADER_SIZE
#undef EXTRA_DATA_OFFSET
#undef EXTRA_DATA_SIZE
#undef NUM_IFD_ENTRIES
//------------------------------------------------------------------------------
// Raw Alpha
int WebPWriteAlphaPlane(FILE* fout, const WebPDecBuffer* const buffer) {
if (fout == NULL || buffer == NULL) {
return 0;
} else {
const uint32_t width = buffer->width;
const uint32_t height = buffer->height;
const uint8_t* a = buffer->u.YUVA.a;
const int a_stride = buffer->u.YUVA.a_stride;
uint32_t y;
if (a == NULL) return 0;
fprintf(fout, "P5\n%u %u\n255\n", width, height);
for (y = 0; y < height; ++y) {
if (fwrite(a, width, 1, fout) != 1) return 0;
a += a_stride;
}
return 1;
}
}
//------------------------------------------------------------------------------
// PGM with IMC4 layout
int WebPWritePGM(FILE* fout, const WebPDecBuffer* const buffer) {
if (fout == NULL || buffer == NULL) {
return 0;
} else {
const int width = buffer->width;
const int height = buffer->height;
const WebPYUVABuffer* const yuv = &buffer->u.YUVA;
const uint8_t* src_y = yuv->y;
const uint8_t* src_u = yuv->u;
const uint8_t* src_v = yuv->v;
const uint8_t* src_a = yuv->a;
const int uv_width = (width + 1) / 2;
const int uv_height = (height + 1) / 2;
const int a_height = (src_a != NULL) ? height : 0;
int ok = 1;
int y;
if (src_y == NULL || src_u == NULL || src_v == NULL) return 0;
fprintf(fout, "P5\n%d %d\n255\n",
(width + 1) & ~1, height + uv_height + a_height);
for (y = 0; ok && y < height; ++y) {
ok &= (fwrite(src_y, width, 1, fout) == 1);
if (width & 1) fputc(0, fout); // padding byte
src_y += yuv->y_stride;
}
for (y = 0; ok && y < uv_height; ++y) {
ok &= (fwrite(src_u, uv_width, 1, fout) == 1);
ok &= (fwrite(src_v, uv_width, 1, fout) == 1);
src_u += yuv->u_stride;
src_v += yuv->v_stride;
}
for (y = 0; ok && y < a_height; ++y) {
ok &= (fwrite(src_a, width, 1, fout) == 1);
if (width & 1) fputc(0, fout); // padding byte
src_a += yuv->a_stride;
}
return ok;
}
}
//------------------------------------------------------------------------------
// Raw YUV(A) planes
int WebPWriteYUV(FILE* fout, const WebPDecBuffer* const buffer) {
if (fout == NULL || buffer == NULL) {
return 0;
} else {
const int width = buffer->width;
const int height = buffer->height;
const WebPYUVABuffer* const yuv = &buffer->u.YUVA;
const uint8_t* src_y = yuv->y;
const uint8_t* src_u = yuv->u;
const uint8_t* src_v = yuv->v;
const uint8_t* src_a = yuv->a;
const int uv_width = (width + 1) / 2;
const int uv_height = (height + 1) / 2;
const int a_height = (src_a != NULL) ? height : 0;
int ok = 1;
int y;
if (src_y == NULL || src_u == NULL || src_v == NULL) return 0;
for (y = 0; ok && y < height; ++y) {
ok &= (fwrite(src_y, width, 1, fout) == 1);
src_y += yuv->y_stride;
}
for (y = 0; ok && y < uv_height; ++y) {
ok &= (fwrite(src_u, uv_width, 1, fout) == 1);
src_u += yuv->u_stride;
}
for (y = 0; ok && y < uv_height; ++y) {
ok &= (fwrite(src_v, uv_width, 1, fout) == 1);
src_v += yuv->v_stride;
}
for (y = 0; ok && y < a_height; ++y) {
ok &= (fwrite(src_a, width, 1, fout) == 1);
src_a += yuv->a_stride;
}
return ok;
}
}
//------------------------------------------------------------------------------
// Generic top-level call
int WebPSaveImage(const WebPDecBuffer* const buffer,
WebPOutputFileFormat format,
const char* const out_file_name) {
FILE* fout = NULL;
int needs_open_file = 1;
const int use_stdout =
(out_file_name != NULL) && !WSTRCMP(out_file_name, "-");
int ok = 1;
if (buffer == NULL || out_file_name == NULL) return 0;
#ifdef HAVE_WINCODEC_H
needs_open_file = (format != PNG);
#endif
if (needs_open_file) {
fout = use_stdout ? ImgIoUtilSetBinaryMode(stdout)
: WFOPEN(out_file_name, "wb");
if (fout == NULL) {
WFPRINTF(stderr, "Error opening output file %s\n",
(const W_CHAR*)out_file_name);
return 0;
}
}
if (format == PNG ||
format == RGBA || format == BGRA || format == ARGB ||
format == rgbA || format == bgrA || format == Argb) {
#ifdef HAVE_WINCODEC_H
ok &= WebPWritePNG(out_file_name, use_stdout, buffer);
#else
ok &= WebPWritePNG(fout, buffer);
#endif
} else if (format == PAM) {
ok &= WebPWritePAM(fout, buffer);
} else if (format == PPM || format == RGB || format == BGR) {
ok &= WebPWritePPM(fout, buffer);
} else if (format == RGBA_4444 || format == RGB_565 || format == rgbA_4444) {
ok &= WebPWrite16bAsPGM(fout, buffer);
} else if (format == BMP) {
ok &= WebPWriteBMP(fout, buffer);
} else if (format == TIFF) {
ok &= WebPWriteTIFF(fout, buffer);
} else if (format == RAW_YUV) {
ok &= WebPWriteYUV(fout, buffer);
} else if (format == PGM || format == YUV || format == YUVA) {
ok &= WebPWritePGM(fout, buffer);
} else if (format == ALPHA_PLANE_ONLY) {
ok &= WebPWriteAlphaPlane(fout, buffer);
}
if (fout != NULL && fout != stdout) {
fclose(fout);
}
return ok;
}
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