saver/png: support png saver #3874

Nor-s · 2025-10-05T06:58:23Z

Changes

Fixed a saver background reference leak 102efc5
Added Static PNG Saver in savers/png
- Copied the necessary PNG encoding functions from lodepng in loaders/png/tvgLodePng.cpp and loaders/png/tvgLodePng.h
  - Enabled CRC in tvgLodePng.cpp when THORVG_PNG_SAVER_SUPPORT is defined. (used only by the saver)
- Added meson option for savers/png
  - Note: png_loader = png_loader or png_saver currently, the lodepng-based implementation resides under the loader module, which introduces an unintended dependency between the loader and saver.
Added External(libpng-based) PNG Saver in savers/external_png
- Since the static PNG version caused a dependency between the loader and saver(tvgLodePng), a new libpng-based PNG saver (external_png) was added to keep them separate.

issue: #3737

Output

Copilot

Pull Request Overview

This PR adds PNG saver functionality to ThorVG with two implementation options: a static PNG saver using lodepng code and an external PNG saver using libpng. The changes include necessary PNG encoding functions copied from the loader module, meson build configuration updates, and test coverage for the new PNG saving capabilities.

Key changes:

Added static PNG saver implementation in savers/png using lodepng functions
Added external PNG saver implementation in savers/external_png using libpng
Updated build system configuration to support PNG saver options
Fixed a background reference leak in the saver module

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/testSavers.cpp	Added PNG saver test cases and updated GIF test file names
src/savers/png/tvgPngSaver.h	Header file for static PNG saver implementation
src/savers/png/tvgPngSaver.cpp	Implementation of static PNG saver using lodepng
src/savers/external_png/tvgPngSaver.h	Header file for external PNG saver implementation
src/savers/external_png/tvgPngSaver.cpp	Implementation of external PNG saver using libpng
src/renderer/tvgSaver.cpp	Updated saver registry to support PNG format and fixed background reference leak
src/loaders/png/tvgLodePng.h	Added PNG encoder structures and function declarations
src/loaders/png/tvgLodePng.cpp	Added PNG encoding functionality when saver support is enabled
meson_options.txt	Added PNG to saver options
meson.build	Added PNG saver configuration and dependencies

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src/loaders/png/tvgLodePng.cpp

hermet · 2025-10-14T07:31:44Z

submitted separately -> aca4a24

hermet · 2025-10-14T08:20:04Z

@Nor-s Hello, I just skimmed through your main commit to decide the approach first.

Basic approach would be like this:

savers/png/tvgPngEncoder //only encoding available
loaders/png/tvgPngDecoder //only decoding available

So that two modules have no dependency and for clean maintenance.

The key decision point for the design here would be how much this increases the binary size. After making visible data, we can decide the approach with:

common/tvgPngCodec // shared by both saver and loader

No remarkable binary size diff, I might prefer to separate implementation.

Thanks for your contribution.

Nor-s · 2025-10-16T20:33:47Z

@hermet

Hello, thank you for the review.

For now, I’ve made a temporary commit to separate the implementation into tvgPngEncoder and tvgPngDecoder.

163382f

To estimate the size of the common code, I’ve temporarily added the encoder-related logic to tvgPngEncoder2.

Common code: tvgPngEncoder.cpp
Encoding code: tvgPngEncoder2

I haven’t compared the binary size yet, but I’ll leave a comment later after checking it.

Thank you.

Common Functions

The following table was generated by AI.

Function	Description	Parameters	Return Type
`HuffmanTree_init`	Initializes a HuffmanTree structure.	`HuffmanTree* tree`	`void`
`HuffmanTree_cleanup`	Frees memory used by a HuffmanTree.	`HuffmanTree* tree`	`void`
`lodepng_memcpy`	Custom implementation of `memcpy`.	`void* dst, const void* src, size_t size`	`void`
`lodepng_memset`	Custom implementation of `memset`.	`void* dst, int value, size_t num`	`void`
`ucvector_resize`	Resizes a dynamic unsigned char vector.	`ucvector* p, size_t size`	`unsigned` (1 = success, 0 = failure)
`ucvector_init`	Initializes a dynamic unsigned char vector.	`unsigned char* buffer, size_t size`	`ucvector`
`reverseBits`	Reverses the bit order of the lower `num` bits.	`unsigned bits, unsigned num`	`unsigned`
`HuffmanTree_makeTable`	Builds lookup tables for Huffman decoding.	`HuffmanTree* tree`	`unsigned` (error code)
`HuffmanTree_makeFromLengths2`	Builds Huffman codes from code lengths (step 2).	`HuffmanTree* tree`	`unsigned`
`HuffmanTree_makeFromLengths`	Builds a Huffman tree from bit length data.	`HuffmanTree* tree, const unsigned* bitlen, size_t numcodes, unsigned maxbitlen`	`unsigned`
`generateFixedLitLenTree`	Creates a fixed literal/length Huffman tree (per Deflate spec).	`HuffmanTree* tree`	`unsigned`
`generateFixedDistanceTree`	Creates a fixed distance Huffman tree (per Deflate spec).	`HuffmanTree* tree`	`unsigned`
`getNumColorChannels`	Returns the number of color channels for a color type.	`LodePNGColorType colortype`	`unsigned`
`lodepng_get_bpp_lct`	Gets bits per pixel for a given color type and bit depth.	`LodePNGColorType colortype, unsigned bitdepth`	`unsigned`
`lodepng_get_raw_size_lct`	Computes raw image size in bytes (color type + bit depth).	`unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth`	`size_t`
`lodepng_get_raw_size`	Returns raw buffer size for an image.	`unsigned w, unsigned h, const LodePNGColorMode* color`	`size_t`
`lodepng_get_raw_size_idat`	Returns raw IDAT chunk buffer size (with filter bytes).	`unsigned w, unsigned h, unsigned bpp`	`size_t`
`color_tree_get`	Finds a color index in a ColorTree.	`ColorTree* tree, unsigned char r, g, b, a`	`int`
`lodepng_color_mode_alloc_palette`	Allocates and initializes a color palette.	`LodePNGColorMode* info`	`void`
`lodepng_palette_clear`	Frees a color palette.	`LodePNGColorMode* info`	`void`
`lodepng_color_mode_cleanup`	Cleans up a color mode (palette etc.).	`LodePNGColorMode* info`	`void`
`lodepng_color_mode_copy`	Copies one color mode to another.	`LodePNGColorMode* dest, const LodePNGColorMode* source`	`unsigned`
`lodepng_info_cleanup`	Cleans up a LodePNGInfo structure.	`LodePNGInfo* info`	`void`
`lodepng_color_mode_init`	Initializes a LodePNGColorMode.	`LodePNGColorMode* info`	`void`
`lodepng_info_init`	Initializes a LodePNGInfo structure.	`LodePNGInfo* info`	`void`
`lodepng_color_mode_equal`	Checks if two color modes are equal.	`const LodePNGColorMode* a, const LodePNGColorMode* b`	`int`
`color_tree_init`	Initializes a ColorTree.	`ColorTree* tree`	`void`
`color_tree_add`	Adds a color to a ColorTree.	`ColorTree* tree, unsigned char r, g, b, a, unsigned index`	`unsigned`
`getPixelColorRGBA16`	Extracts RGBA16 pixel values.	`unsigned short* r,g,b,a, const unsigned char* in, size_t i, const LodePNGColorMode* mode`	`void`
`rgba16ToPixel`	Converts RGBA16 to target color mode pixel.	`unsigned char* out, size_t i, const LodePNGColorMode* mode, unsigned short r,g,b,a`	`void`
`addColorBits`	Adds color bits to output stream.	`unsigned char* out, size_t index, unsigned bits, unsigned in`	`void`
`rgba8ToPixel`	Converts RGBA8 color to specified mode pixel.	`unsigned char* out, size_t i, const LodePNGColorMode* mode, ColorTree* tree, unsigned char r,g,b,a`	`unsigned`
`readBitFromReversedStream`	Reads a single bit (MSB first).	`size_t* bitpointer, const unsigned char* bitstream`	`unsigned char`
`readBitsFromReversedStream`	Reads multiple bits from a bitstream.	`size_t* bitpointer, const unsigned char* bitstream, size_t nbits`	`unsigned`
`getPixelColorsRGBA8`	Converts raw input to RGBA8 buffer.	`unsigned char* buffer, size_t numpixels, const unsigned char* in, const LodePNGColorMode* mode`	`void`
`color_tree_cleanup`	Recursively frees a ColorTree.	`ColorTree* tree`	`void`
`getPixelColorsRGB8`	Converts raw input to RGB8 buffer.	`unsigned char* buffer, size_t numpixels, const unsigned char* in, const LodePNGColorMode* mode`	`void`
`getPixelColorRGBA8`	Extracts RGBA8 values from input.	`unsigned char* r,g,b,a, const unsigned char* in, size_t i, const LodePNGColorMode* mode`	`void`
`lodepng_convert`	Converts between different color formats.	`unsigned char* out, const unsigned char* in, const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, unsigned w, unsigned h`	`unsigned`
`lodepng_compress_settings_init`	Initializes compression settings.	`LodePNGCompressSettings* settings`	`void`
`lodepng_encoder_settings_init`	Initializes encoder settings.	`LodePNGEncoderSettings* settings`	`void`
`lodepng_state_init`	Initializes a LodePNG state.	`LodePNGState* state`	`void`
`lodepng_state_cleanup`	Frees all memory in a LodePNG state.	`LodePNGState* state`	`void`
`lodepng_addofl`	Checks integer addition overflow.	`size_t a, size_t b, size_t* result`	`int`
`lodepng_read32bitInt`	Reads 32-bit integer from bytes (big-endian).	`const unsigned char* buffer`	`unsigned`
`lodepng_chunk_length`	Reads PNG chunk length.	`const unsigned char* chunk`	`unsigned`
`setBitOfReversedStream`	Sets a single bit in a reversed bitstream.	`size_t* bitpointer, unsigned char* bitstream, unsigned char bit`	`void`
`update_adler32`	Updates Adler-32 checksum.	`unsigned adler, const unsigned char* data, unsigned len`	`unsigned`
`adler32`	Computes Adler-32 checksum.	`const unsigned char* data, unsigned len`	`unsigned`
`paethPredictor`	Implements PNG Paeth predictor filter.	`short a, short b, short c`	`unsigned char`
`Adam7_getpassvalues`	Calculates dimensions for each Adam7 interlace pass.	`unsigned passw[7], passh[7], size_t filter_passstart[8], size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp`	`void`
`checkColorValidity`	Validates color type and bit depth combination.	`LodePNGColorType colortype, unsigned bd`	`unsigned`

Nor-s · 2025-10-19T15:07:43Z

@hermet

Hello, I’ve checked the binary size differences.
The unified version (before d810dca) is about 16.928KB smaller than the split version (encoder/decoder separated).

Would you consider this size difference negligible?
If yes, I agree that keeping the separated implementation for cleaner maintenance sounds reasonable.

Thanks for your feedback!

Case	File Size (Bytes)	text	data	text + data
No Png	1109984	1082117	17880	1099997 (-)
Png Loader	1159136	1132961	18040	1151001 (+ 51004)
Png Saver	1171424	1142597	17976	1160573 (+ 60576)
Png Loader + Png Saver	1220576	1193333	18136	1211469 (+111472)
Unified PNG Module (no split)	1204192	1176405	18136	1194541 (+ 94544)

details...

1. Loader + Saver

meson builddir -Dloaders='svg,lottie,ttf,png'  -Dsavers='gif,png' -Dengines=sw -Dstatic=true -Dbuildtype=release --wipe

nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1443480 Oct 19 23:13 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ strip ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1220576 Oct 19 23:13 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ size ./builddir/src/libthorvg.so.1.0.0
   text    data     bss     dec     hex filename
1193333   18136  528832 1740301  1a8e0d ./builddir/src/libthorvg.so.1.0.0

2. Only Saver

meson builddir -Dloaders='svg,lottie,ttf'  -Dsavers='gif,png' -Dengines=sw -Dstatic=true -Dbuildtype=release --wipe

nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ meson compile -C builddir
INFO: autodetecting backend as ninja
INFO: calculating backend command to run: /usr/bin/ninja -C /home/nsg/gitrepo/OpenSource/gifinspector/subprojects/thorvg/builddir
ninja: Entering directory `/home/nsg/gitrepo/OpenSource/gifinspector/subprojects/thorvg/builddir'
[242/242] Linking target src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1392432 Oct 19 23:10 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ strip ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1171424 Oct 19 23:11 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ size ./builddir/src/libthorvg.so.1.0.0
   text    data     bss     dec     hex filename
1142597   17976  528832 1689405  19c73d ./builddir/src/libthorvg.so.1.0.0

3. Only Loader

meson builddir -Dloaders='svg,lottie,ttf,png'  -Dsavers='gif' -Dengines=sw -Dstatic=true -Dbuildtype=release --wipe

nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ meson compile -C builddir
INFO: autodetecting backend as ninja
INFO: calculating backend command to run: /usr/bin/ninja -C /home/nsg/gitrepo/OpenSource/gifinspector/subprojects/thorvg/builddir
ninja: Entering directory `/home/nsg/gitrepo/OpenSource/gifinspector/subprojects/thorvg/builddir'
[242/242] Linking target src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1378176 Oct 19 23:16 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ strip ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1159136 Oct 19 23:17 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ size ./builddir/src/libthorvg.so.1.0.0
   text    data     bss     dec     hex filename
1132961   18040  528832 1679833  19a1d9 ./builddir/src/libthorvg.so.1.0.0

4. No Png

meson builddir -Dloaders='svg,lottie,ttf'  -Dsavers='gif' -Dengines=sw -Dstatic=true -Dbuildtype=release --wipe

nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1326816 Oct 19 23:24 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ strip ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1109984 Oct 19 23:25 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ size ./builddir/src/libthorvg.so.1.0.0
   text    data     bss     dec     hex filename
1082117   17880  528832 1628829  18da9d ./builddir/src/libthorvg.so.1.0.0

5. before `d810dca`

meson builddir -Dloaders='svg,lottie,ttf,png'  -Dsavers='gif,png' -Dengines=sw -Dstatic=true -Dbuildtype=release --wipe

nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ meson compile -C builddir
INFO: autodetecting backend as ninja
INFO: calculating backend command to run: /usr/bin/ninja -C /home/nsg/gitrepo/OpenSource/gifinspector/subprojects/thorvg/builddir
ninja: Entering directory `/home/nsg/gitrepo/OpenSource/gifinspector/subprojects/thorvg/builddir'
[243/243] Linking target src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1427040 Oct 19 23:46 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ strip ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ ls -l ./builddir/src/libthorvg.so.1.0.0
-rwxr-xr-x 1 nsg nsg 1204192 Oct 19 23:46 ./builddir/src/libthorvg.so.1.0.0
nsg@DESKTOP-P8H04FD:~/gitrepo/OpenSource/gifinspector/subprojects/thorvg$ size ./builddir/src/libthorvg.so.1.0.0
   text    data     bss     dec     hex filename
1176405   18136  528832 1723373  1a4bed ./builddir/src/libthorvg.so.1.0.0

hermet · 2025-10-20T03:53:06Z

1204192

@Nor-s Thanks for the detailed information. I think we need to proceed with a unified version -> (common/tvgPngCodec.h and .cpp) I think you can first add a commit to refactor the PNG loader (png/tvgLodePng → common/tvgPngCodec). We can then build the saver feature on top of it.

This patch replaces the previous decode-only lodePng-based implementation (`tvgLodePng`) with a unified `tvgPngCodec` used by both the PNG loader and saver modules. Key updates: - Added static PNG saver support (copied only necessary encoding functions from lodepng: https://lodev.org/lodepng/) - Added external PNG saver support using libpng issue: thorvg#3737

issue: thorvg#3737

Nor-s · 2025-10-26T14:00:19Z

@hermet

Hello, sorry for the delay.
I’ve refactored the PNG loader into common/tvgPngCodec as suggested.

Below are the binary size measurements after the update:

Binary Size

Case	Binary Size	text	data	text + data
No Png	1109984	1082117	17880	1099997
Png Loader	1155040 (+45056)	1129577	18040	1147617 (+47620)
Png Saver	1171424 (+61440)	1142881	17976	1160857 (+60860)
Png Loader + Png Saver	1204192 (+94208)	1175093	18136	1193229 (+93232)

Please let me know if you notice any issues or have further suggestions.
Thank you for your time and feedback.

github-actions bot added infrastructure Dev infrastructure tools Tvg Viewer / Tools test Unit tests renderer Core rendering labels Oct 5, 2025

Nor-s self-assigned this Oct 5, 2025

Nor-s force-pushed the issue-3737-support-png-saver branch from 85cce51 to 6917a3d Compare October 7, 2025 11:47

github-actions bot added image Bitmap image features (jpg/png/webp/gif) and removed tools Tvg Viewer / Tools labels Oct 7, 2025

Nor-s force-pushed the issue-3737-support-png-saver branch 3 times, most recently from 3ba970d to 174f70f Compare October 7, 2025 14:16

Nor-s marked this pull request as ready for review October 7, 2025 14:22

Nor-s requested a review from hermet as a code owner October 7, 2025 14:22

hermet requested a review from Copilot October 10, 2025 06:12

Copilot AI reviewed Oct 10, 2025

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src/loaders/png/tvgLodePng.cpp Outdated Show resolved Hide resolved

Nor-s force-pushed the issue-3737-support-png-saver branch from 3848504 to e863091 Compare October 12, 2025 05:49

hermet requested a review from tinyjin October 13, 2025 03:35

hermet force-pushed the main branch 5 times, most recently from d471af2 to 0aaa738 Compare October 13, 2025 13:18

Nor-s force-pushed the issue-3737-support-png-saver branch 2 times, most recently from f8b6dff to 7fa65c4 Compare October 13, 2025 15:27

hermet force-pushed the issue-3737-support-png-saver branch from 7fa65c4 to ceffcf5 Compare October 14, 2025 07:31

hermet added the feature New feature additions label Oct 14, 2025

hermet removed the request for review from tinyjin October 14, 2025 08:22

Nor-s force-pushed the issue-3737-support-png-saver branch from 163382f to d810dca Compare October 19, 2025 14:44

hermet force-pushed the main branch from 149a154 to 3d7d6ab Compare October 22, 2025 11:44

Nor-s force-pushed the issue-3737-support-png-saver branch from d810dca to 884dbef Compare October 26, 2025 13:37

Nor-s added 2 commits October 26, 2025 22:47

test/saver: add PngSaver test code

aab4320

issue: thorvg#3737

Nor-s force-pushed the issue-3737-support-png-saver branch from 884dbef to aab4320 Compare October 26, 2025 13:48

hermet force-pushed the main branch 14 times, most recently from 9c9fe06 to 1b33069 Compare November 8, 2025 18:52

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1. Loader + Saver

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4. No Png

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Common Functions

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1. Loader + Saver

2. Only Saver

3. Only Loader

4. No Png

5. before d810dca

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5. before `d810dca`