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/*
* Copyright 2016 Dmitry Timoshkov
* Copyright 2020 Esme Povirk
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include <png.h>
#define NONAMELESSUNION
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "winbase.h"
#include "objbase.h"
#include "wincodecs_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
struct png_decoder
{
struct decoder decoder;
IStream *stream;
struct decoder_frame decoder_frame;
UINT stride;
BYTE *image_bits;
BYTE *color_profile;
DWORD color_profile_len;
};
static inline struct png_decoder *impl_from_decoder(struct decoder* iface)
{
return CONTAINING_RECORD(iface, struct png_decoder, decoder);
}
static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
IStream *stream = png_get_io_ptr(png_ptr);
HRESULT hr;
ULONG bytesread;
hr = stream_read(stream, data, length, &bytesread);
if (FAILED(hr) || bytesread != length)
{
png_error(png_ptr, "failed reading data");
}
}
static HRESULT CDECL png_decoder_initialize(struct decoder *iface, IStream *stream, struct decoder_stat *st)
{
struct png_decoder *This = impl_from_decoder(iface);
png_structp png_ptr;
png_infop info_ptr;
HRESULT hr = E_FAIL;
int color_type, bit_depth;
png_bytep trans;
int num_trans;
png_uint_32 transparency;
png_color_16p trans_values;
png_uint_32 ret, xres, yres;
int unit_type;
png_colorp png_palette;
int num_palette;
int i;
UINT image_size;
png_bytep *row_pointers=NULL;
png_charp cp_name;
png_bytep cp_profile;
png_uint_32 cp_len;
int cp_compression;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
return E_FAIL;
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_read_struct(&png_ptr, NULL, NULL);
return E_FAIL;
}
/* set up setjmp/longjmp error handling */
if (setjmp(png_jmpbuf(png_ptr)))
{
hr = WINCODEC_ERR_UNKNOWNIMAGEFORMAT;
goto end;
}
png_set_crc_action(png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
/* seek to the start of the stream */
hr = stream_seek(stream, 0, STREAM_SEEK_SET, NULL);
if (FAILED(hr))
{
goto end;
}
/* set up custom i/o handling */
png_set_read_fn(png_ptr, stream, user_read_data);
/* read the header */
png_read_info(png_ptr, info_ptr);
/* choose a pixel format */
color_type = png_get_color_type(png_ptr, info_ptr);
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
/* PNGs with bit-depth greater than 8 are network byte order. Windows does not expect this. */
if (bit_depth > 8)
png_set_swap(png_ptr);
/* check for color-keyed alpha */
transparency = png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, &trans_values);
if (!transparency)
num_trans = 0;
if (transparency && (color_type == PNG_COLOR_TYPE_RGB ||
(color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16)))
{
/* expand to RGBA */
if (color_type == PNG_COLOR_TYPE_GRAY)
png_set_gray_to_rgb(png_ptr);
png_set_tRNS_to_alpha(png_ptr);
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
}
switch (color_type)
{
case PNG_COLOR_TYPE_GRAY_ALPHA:
/* WIC does not support grayscale alpha formats so use RGBA */
png_set_gray_to_rgb(png_ptr);
/* fall through */
case PNG_COLOR_TYPE_RGB_ALPHA:
This->decoder_frame.bpp = bit_depth * 4;
switch (bit_depth)
{
case 8:
png_set_bgr(png_ptr);
This->decoder_frame.pixel_format = GUID_WICPixelFormat32bppBGRA;
break;
case 16: This->decoder_frame.pixel_format = GUID_WICPixelFormat64bppRGBA; break;
default:
ERR("invalid RGBA bit depth: %i\n", bit_depth);
hr = E_FAIL;
goto end;
}
break;
case PNG_COLOR_TYPE_GRAY:
This->decoder_frame.bpp = bit_depth;
if (!transparency)
{
switch (bit_depth)
{
case 1: This->decoder_frame.pixel_format = GUID_WICPixelFormatBlackWhite; break;
case 2: This->decoder_frame.pixel_format = GUID_WICPixelFormat2bppGray; break;
case 4: This->decoder_frame.pixel_format = GUID_WICPixelFormat4bppGray; break;
case 8: This->decoder_frame.pixel_format = GUID_WICPixelFormat8bppGray; break;
case 16: This->decoder_frame.pixel_format = GUID_WICPixelFormat16bppGray; break;
default:
ERR("invalid grayscale bit depth: %i\n", bit_depth);
hr = E_FAIL;
goto end;
}
break;
}
/* else fall through */
case PNG_COLOR_TYPE_PALETTE:
This->decoder_frame.bpp = bit_depth;
switch (bit_depth)
{
case 1: This->decoder_frame.pixel_format = GUID_WICPixelFormat1bppIndexed; break;
case 2: This->decoder_frame.pixel_format = GUID_WICPixelFormat2bppIndexed; break;
case 4: This->decoder_frame.pixel_format = GUID_WICPixelFormat4bppIndexed; break;
case 8: This->decoder_frame.pixel_format = GUID_WICPixelFormat8bppIndexed; break;
default:
ERR("invalid indexed color bit depth: %i\n", bit_depth);
hr = E_FAIL;
goto end;
}
break;
case PNG_COLOR_TYPE_RGB:
This->decoder_frame.bpp = bit_depth * 3;
switch (bit_depth)
{
case 8:
png_set_bgr(png_ptr);
This->decoder_frame.pixel_format = GUID_WICPixelFormat24bppBGR;
break;
case 16: This->decoder_frame.pixel_format = GUID_WICPixelFormat48bppRGB; break;
default:
ERR("invalid RGB color bit depth: %i\n", bit_depth);
hr = E_FAIL;
goto end;
}
break;
default:
ERR("invalid color type %i\n", color_type);
hr = E_FAIL;
goto end;
}
This->decoder_frame.width = png_get_image_width(png_ptr, info_ptr);
This->decoder_frame.height = png_get_image_height(png_ptr, info_ptr);
ret = png_get_pHYs(png_ptr, info_ptr, &xres, &yres, &unit_type);
if (ret && unit_type == PNG_RESOLUTION_METER)
{
This->decoder_frame.dpix = xres * 0.0254;
This->decoder_frame.dpiy = yres * 0.0254;
}
else
{
WARN("no pHYs block present\n");
This->decoder_frame.dpix = This->decoder_frame.dpiy = 96.0;
}
ret = png_get_iCCP(png_ptr, info_ptr, &cp_name, &cp_compression, &cp_profile, &cp_len);
if (ret)
{
This->decoder_frame.num_color_contexts = 1;
This->color_profile_len = cp_len;
This->color_profile = malloc(cp_len);
if (!This->color_profile)
{
hr = E_OUTOFMEMORY;
goto end;
}
memcpy(This->color_profile, cp_profile, cp_len);
}
else
This->decoder_frame.num_color_contexts = 0;
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
ret = png_get_PLTE(png_ptr, info_ptr, &png_palette, &num_palette);
if (!ret)
{
ERR("paletted image with no PLTE chunk\n");
hr = E_FAIL;
goto end;
}
if (num_palette > 256)
{
ERR("palette has %i colors?!\n", num_palette);
hr = E_FAIL;
goto end;
}
This->decoder_frame.num_colors = num_palette;
for (i=0; i<num_palette; i++)
{
BYTE alpha = (i < num_trans) ? trans[i] : 0xff;
This->decoder_frame.palette[i] = (alpha << 24 |
png_palette[i].red << 16|
png_palette[i].green << 8|
png_palette[i].blue);
}
}
else if (color_type == PNG_COLOR_TYPE_GRAY && transparency && bit_depth <= 8) {
num_palette = 1 << bit_depth;
This->decoder_frame.num_colors = num_palette;
for (i=0; i<num_palette; i++)
{
BYTE alpha = (i == trans_values[0].gray) ? 0 : 0xff;
BYTE val = i * 255 / (num_palette - 1);
This->decoder_frame.palette[i] = (alpha << 24 | val << 16 | val << 8 | val);
}
}
else
{
This->decoder_frame.num_colors = 0;
}
This->stride = (This->decoder_frame.width * This->decoder_frame.bpp + 7) / 8;
image_size = This->stride * This->decoder_frame.height;
This->image_bits = malloc(image_size);
if (!This->image_bits)
{
hr = E_OUTOFMEMORY;
goto end;
}
row_pointers = malloc(sizeof(png_bytep)*This->decoder_frame.height);
if (!row_pointers)
{
hr = E_OUTOFMEMORY;
goto end;
}
for (i=0; i<This->decoder_frame.height; i++)
row_pointers[i] = This->image_bits + i * This->stride;
png_read_image(png_ptr, row_pointers);
free(row_pointers);
row_pointers = NULL;
/* png_read_end intentionally not called to not seek to the end of the file */
st->flags = WICBitmapDecoderCapabilityCanDecodeAllImages |
WICBitmapDecoderCapabilityCanDecodeSomeImages |
WICBitmapDecoderCapabilityCanEnumerateMetadata;
st->frame_count = 1;
This->stream = stream;
hr = S_OK;
end:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(row_pointers);
if (FAILED(hr))
{
free(This->image_bits);
This->image_bits = NULL;
free(This->color_profile);
This->color_profile = NULL;
}
return hr;
}
static HRESULT CDECL png_decoder_get_frame_info(struct decoder *iface, UINT frame, struct decoder_frame *info)
{
struct png_decoder *This = impl_from_decoder(iface);
*info = This->decoder_frame;
return S_OK;
}
static HRESULT CDECL png_decoder_copy_pixels(struct decoder *iface, UINT frame,
const WICRect *prc, UINT stride, UINT buffersize, BYTE *buffer)
{
struct png_decoder *This = impl_from_decoder(iface);
return copy_pixels(This->decoder_frame.bpp, This->image_bits,
This->decoder_frame.width, This->decoder_frame.height, This->stride,
prc, stride, buffersize, buffer);
}
static HRESULT CDECL png_decoder_get_metadata_blocks(struct decoder* iface,
UINT frame, UINT *count, struct decoder_block **blocks)
{
struct png_decoder *This = impl_from_decoder(iface);
HRESULT hr;
struct decoder_block *result = NULL;
ULONGLONG seek;
BYTE chunk_type[4];
ULONG chunk_size;
ULONGLONG chunk_start;
ULONG metadata_blocks_size = 0;
seek = 8;
*count = 0;
do
{
hr = stream_seek(This->stream, seek, STREAM_SEEK_SET, &chunk_start);
if (FAILED(hr)) goto end;
hr = read_png_chunk(This->stream, chunk_type, NULL, &chunk_size);
if (FAILED(hr)) goto end;
if (chunk_type[0] >= 'a' && chunk_type[0] <= 'z' &&
memcmp(chunk_type, "tRNS", 4) && memcmp(chunk_type, "pHYs", 4))
{
/* This chunk is considered metadata. */
if (*count == metadata_blocks_size)
{
struct decoder_block *new_metadata_blocks;
ULONG new_metadata_blocks_size;
new_metadata_blocks_size = 4 + metadata_blocks_size * 2;
new_metadata_blocks = RtlAllocateHeap(GetProcessHeap(), 0,
new_metadata_blocks_size * sizeof(*new_metadata_blocks));
if (!new_metadata_blocks)
{
hr = E_OUTOFMEMORY;
goto end;
}
memcpy(new_metadata_blocks, result,
*count * sizeof(*new_metadata_blocks));
RtlFreeHeap(GetProcessHeap(), 0, result);
result = new_metadata_blocks;
metadata_blocks_size = new_metadata_blocks_size;
}
result[*count].offset = chunk_start;
result[*count].length = chunk_size + 12;
result[*count].options = WICMetadataCreationAllowUnknown;
(*count)++;
}
seek = chunk_start + chunk_size + 12; /* skip data and CRC */
} while (memcmp(chunk_type, "IEND", 4));
end:
if (SUCCEEDED(hr))
{
*blocks = result;
}
else
{
*count = 0;
*blocks = NULL;
RtlFreeHeap(GetProcessHeap(), 0, result);
}
return hr;
}
static HRESULT CDECL png_decoder_get_color_context(struct decoder* iface, UINT frame, UINT num,
BYTE **data, DWORD *datasize)
{
struct png_decoder *This = impl_from_decoder(iface);
*data = RtlAllocateHeap(GetProcessHeap(), 0, This->color_profile_len);
*datasize = This->color_profile_len;
if (!*data)
return E_OUTOFMEMORY;
memcpy(*data, This->color_profile, This->color_profile_len);
return S_OK;
}
static void CDECL png_decoder_destroy(struct decoder* iface)
{
struct png_decoder *This = impl_from_decoder(iface);
free(This->image_bits);
free(This->color_profile);
RtlFreeHeap(GetProcessHeap(), 0, This);
}
static const struct decoder_funcs png_decoder_vtable = {
png_decoder_initialize,
png_decoder_get_frame_info,
png_decoder_copy_pixels,
png_decoder_get_metadata_blocks,
png_decoder_get_color_context,
png_decoder_destroy
};
HRESULT CDECL png_decoder_create(struct decoder_info *info, struct decoder **result)
{
struct png_decoder *This;
This = RtlAllocateHeap(GetProcessHeap(), 0, sizeof(*This));
if (!This)
{
return E_OUTOFMEMORY;
}
This->decoder.vtable = &png_decoder_vtable;
This->image_bits = NULL;
This->color_profile = NULL;
*result = &This->decoder;
info->container_format = GUID_ContainerFormatPng;
info->block_format = GUID_ContainerFormatPng;
info->clsid = CLSID_WICPngDecoder;
return S_OK;
}
struct png_pixelformat {
const WICPixelFormatGUID *guid;
UINT bpp;
int bit_depth;
int color_type;
BOOL remove_filler;
BOOL swap_rgb;
};
static const struct png_pixelformat formats[] = {
{&GUID_WICPixelFormat32bppBGRA, 32, 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 1},
{&GUID_WICPixelFormat24bppBGR, 24, 8, PNG_COLOR_TYPE_RGB, 0, 1},
{&GUID_WICPixelFormatBlackWhite, 1, 1, PNG_COLOR_TYPE_GRAY, 0, 0},
{&GUID_WICPixelFormat2bppGray, 2, 2, PNG_COLOR_TYPE_GRAY, 0, 0},
{&GUID_WICPixelFormat4bppGray, 4, 4, PNG_COLOR_TYPE_GRAY, 0, 0},
{&GUID_WICPixelFormat8bppGray, 8, 8, PNG_COLOR_TYPE_GRAY, 0, 0},
{&GUID_WICPixelFormat16bppGray, 16, 16, PNG_COLOR_TYPE_GRAY, 0, 0},
{&GUID_WICPixelFormat32bppBGR, 32, 8, PNG_COLOR_TYPE_RGB, 1, 1},
{&GUID_WICPixelFormat48bppRGB, 48, 16, PNG_COLOR_TYPE_RGB, 0, 0},
{&GUID_WICPixelFormat64bppRGBA, 64, 16, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0},
{&GUID_WICPixelFormat1bppIndexed, 1, 1, PNG_COLOR_TYPE_PALETTE, 0, 0},
{&GUID_WICPixelFormat2bppIndexed, 2, 2, PNG_COLOR_TYPE_PALETTE, 0, 0},
{&GUID_WICPixelFormat4bppIndexed, 4, 4, PNG_COLOR_TYPE_PALETTE, 0, 0},
{&GUID_WICPixelFormat8bppIndexed, 8, 8, PNG_COLOR_TYPE_PALETTE, 0, 0},
{NULL},
};
struct png_encoder
{
struct encoder encoder;
IStream *stream;
png_structp png_ptr;
png_infop info_ptr;
struct encoder_frame encoder_frame;
const struct png_pixelformat *format;
BYTE *data;
UINT stride;
UINT passes;
UINT lines_written;
};
static inline struct png_encoder *impl_from_encoder(struct encoder* iface)
{
return CONTAINING_RECORD(iface, struct png_encoder, encoder);
}
static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
struct png_encoder *This = png_get_io_ptr(png_ptr);
HRESULT hr;
ULONG byteswritten;
hr = stream_write(This->stream, data, length, &byteswritten);
if (FAILED(hr) || byteswritten != length)
{
png_error(png_ptr, "failed writing data");
}
}
static void user_flush(png_structp png_ptr)
{
}
static HRESULT CDECL png_encoder_initialize(struct encoder *encoder, IStream *stream)
{
struct png_encoder *This = impl_from_encoder(encoder);
TRACE("(%p,%p)\n", encoder, stream);
/* initialize libpng */
This->png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!This->png_ptr)
return E_FAIL;
This->info_ptr = png_create_info_struct(This->png_ptr);
if (!This->info_ptr)
{
png_destroy_write_struct(&This->png_ptr, NULL);
This->png_ptr = NULL;
return E_FAIL;
}
This->stream = stream;
/* set up setjmp/longjmp error handling */
if (setjmp(png_jmpbuf(This->png_ptr)))
{
png_destroy_write_struct(&This->png_ptr, &This->info_ptr);
This->png_ptr = NULL;
This->stream = NULL;
return E_FAIL;
}
/* set up custom i/o handling */
png_set_write_fn(This->png_ptr, This, user_write_data, user_flush);
return S_OK;
}
static HRESULT CDECL png_encoder_get_supported_format(struct encoder* iface, GUID *pixel_format, DWORD *bpp, BOOL *indexed)
{
int i;
for (i=0; formats[i].guid; i++)
{
if (memcmp(formats[i].guid, pixel_format, sizeof(GUID)) == 0)
break;
}
if (!formats[i].guid)
i = 0;
*pixel_format = *formats[i].guid;
*bpp = formats[i].bpp;
*indexed = (formats[i].color_type == PNG_COLOR_TYPE_PALETTE);
return S_OK;
}
static HRESULT CDECL png_encoder_create_frame(struct encoder *encoder, const struct encoder_frame *encoder_frame)
{
struct png_encoder *This = impl_from_encoder(encoder);
int i;
for (i=0; formats[i].guid; i++)
{
if (memcmp(formats[i].guid, &encoder_frame->pixel_format, sizeof(GUID)) == 0)
{
This->format = &formats[i];
break;
}
}
if (!formats[i].guid)
{
ERR("invalid pixel format %s\n", wine_dbgstr_guid(&encoder_frame->pixel_format));
return E_FAIL;
}
/* set up setjmp/longjmp error handling */
if (setjmp(png_jmpbuf(This->png_ptr)))
return E_FAIL;
This->encoder_frame = *encoder_frame;
This->lines_written = 0;
if (encoder_frame->interlace)
{
/* libpng requires us to write all data multiple times in this case. */
This->stride = (This->format->bpp * encoder_frame->width + 7)/8;
This->data = malloc(encoder_frame->height * This->stride);
if (!This->data)
return E_OUTOFMEMORY;
}
/* Tell PNG we need to byte swap if writing a >8-bpp image */
if (This->format->bit_depth > 8)
png_set_swap(This->png_ptr);
png_set_IHDR(This->png_ptr, This->info_ptr, encoder_frame->width, encoder_frame->height,
This->format->bit_depth, This->format->color_type,
encoder_frame->interlace ? PNG_INTERLACE_ADAM7 : PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
if (encoder_frame->dpix != 0.0 && encoder_frame->dpiy != 0.0)
{
png_set_pHYs(This->png_ptr, This->info_ptr, (encoder_frame->dpix+0.0127) / 0.0254,
(encoder_frame->dpiy+0.0127) / 0.0254, PNG_RESOLUTION_METER);
}
if (This->format->color_type == PNG_COLOR_TYPE_PALETTE && encoder_frame->num_colors)
{
png_color png_palette[256];
png_byte trans[256];
UINT i, num_trans = 0, colors;
/* Newer libpng versions don't accept larger palettes than the declared
* bit depth, so we need to generate the palette of the correct length.
*/
colors = min(encoder_frame->num_colors, 1 << This->format->bit_depth);
for (i = 0; i < colors; i++)
{
png_palette[i].red = (encoder_frame->palette[i] >> 16) & 0xff;
png_palette[i].green = (encoder_frame->palette[i] >> 8) & 0xff;
png_palette[i].blue = encoder_frame->palette[i] & 0xff;
trans[i] = (encoder_frame->palette[i] >> 24) & 0xff;
if (trans[i] != 0xff)
num_trans = i+1;
}
png_set_PLTE(This->png_ptr, This->info_ptr, png_palette, colors);
if (num_trans)
png_set_tRNS(This->png_ptr, This->info_ptr, trans, num_trans, NULL);
}
png_write_info(This->png_ptr, This->info_ptr);
if (This->format->remove_filler)
png_set_filler(This->png_ptr, 0, PNG_FILLER_AFTER);
if (This->format->swap_rgb)
png_set_bgr(This->png_ptr);
if (encoder_frame->interlace)
This->passes = png_set_interlace_handling(This->png_ptr);
if (encoder_frame->filter != WICPngFilterUnspecified)
{
static const int png_filter_map[] =
{
/* WICPngFilterUnspecified */ PNG_NO_FILTERS,
/* WICPngFilterNone */ PNG_FILTER_NONE,
/* WICPngFilterSub */ PNG_FILTER_SUB,
/* WICPngFilterUp */ PNG_FILTER_UP,
/* WICPngFilterAverage */ PNG_FILTER_AVG,
/* WICPngFilterPaeth */ PNG_FILTER_PAETH,
/* WICPngFilterAdaptive */ PNG_ALL_FILTERS,
};
png_set_filter(This->png_ptr, 0, png_filter_map[encoder_frame->filter]);
}
return S_OK;
}
static HRESULT CDECL png_encoder_write_lines(struct encoder* encoder, BYTE *data, DWORD line_count, DWORD stride)
{
struct png_encoder *This = impl_from_encoder(encoder);
png_byte **row_pointers=NULL;
UINT i;
if (This->encoder_frame.interlace)
{
/* Just store the data so we can write it in multiple passes in Commit. */
for (i=0; i<line_count; i++)
memcpy(This->data + This->stride * (This->lines_written + i),
data + stride * i,
This->stride);
This->lines_written += line_count;
return S_OK;
}
/* set up setjmp/longjmp error handling */
if (setjmp(png_jmpbuf(This->png_ptr)))
{
free(row_pointers);
return E_FAIL;
}
row_pointers = malloc(line_count * sizeof(png_byte*));
if (!row_pointers)
return E_OUTOFMEMORY;
for (i=0; i<line_count; i++)
row_pointers[i] = data + stride * i;
png_write_rows(This->png_ptr, row_pointers, line_count);
This->lines_written += line_count;
free(row_pointers);
return S_OK;
}
static HRESULT CDECL png_encoder_commit_frame(struct encoder *encoder)
{
struct png_encoder *This = impl_from_encoder(encoder);
png_byte **row_pointers=NULL;
/* set up setjmp/longjmp error handling */
if (setjmp(png_jmpbuf(This->png_ptr)))
{
free(row_pointers);
return E_FAIL;
}
if (This->encoder_frame.interlace)
{
int i;
row_pointers = malloc(This->encoder_frame.height * sizeof(png_byte*));
if (!row_pointers)
return E_OUTOFMEMORY;
for (i=0; i<This->encoder_frame.height; i++)
row_pointers[i] = This->data + This->stride * i;
for (i=0; i<This->passes; i++)
png_write_rows(This->png_ptr, row_pointers, This->encoder_frame.height);
}
png_write_end(This->png_ptr, This->info_ptr);
free(row_pointers);
return S_OK;
}
static HRESULT CDECL png_encoder_commit_file(struct encoder *encoder)
{
return S_OK;
}
static void CDECL png_encoder_destroy(struct encoder *encoder)
{
struct png_encoder *This = impl_from_encoder(encoder);
if (This->png_ptr)
png_destroy_write_struct(&This->png_ptr, &This->info_ptr);
free(This->data);
RtlFreeHeap(GetProcessHeap(), 0, This);
}
static const struct encoder_funcs png_encoder_vtable = {
png_encoder_initialize,
png_encoder_get_supported_format,
png_encoder_create_frame,
png_encoder_write_lines,
png_encoder_commit_frame,
png_encoder_commit_file,
png_encoder_destroy
};
HRESULT CDECL png_encoder_create(struct encoder_info *info, struct encoder **result)
{
struct png_encoder *This;
This = RtlAllocateHeap(GetProcessHeap(), 0, sizeof(*This));
if (!This)
{
return E_OUTOFMEMORY;
}
This->encoder.vtable = &png_encoder_vtable;
This->png_ptr = NULL;
This->info_ptr = NULL;
This->data = NULL;
*result = &This->encoder;
info->flags = ENCODER_FLAGS_SUPPORTS_METADATA;
info->container_format = GUID_ContainerFormatPng;
info->clsid = CLSID_WICPngEncoder;
info->encoder_options[0] = ENCODER_OPTION_INTERLACE;
info->encoder_options[1] = ENCODER_OPTION_FILTER;
info->encoder_options[2] = ENCODER_OPTION_END;
return S_OK;
}
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