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Improved 1D support for GIF images, bugfixes, blur option by @DedeHai & @softhack007

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- add better support for 1D gifs: use the full gif, row by row, scale if needed
- add blur slider to image FX
- improved safety checks to avoid crashes
- add "fast path" if image size matches virtual segment size
This commit is contained in:
Damian Schneider
2025-11-14 18:22:31 +01:00
committed by Frank
parent a833cb5706
commit ca35e9914a
1 changed files with 96 additions and 57 deletions
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153
wled00/image_loader.cpp
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@@ -5,13 +5,18 @@
#include "GifDecoder.h"
//upstream compatibility
#if !defined(WLED_MAX_SEGNAME_LEN)
#define WLED_MAX_SEGNAME_LEN 32
#endif
/*
* Functions to render images from filesystem to segments, used by the "Image" effect
*/
static File file;
static char lastFilename[34] = "/";
static GifDecoder<320,320,12,true> decoder; // this creates the basic object; parameter lzwMaxBits is not used; decoder.alloc() always allocated "everything else" = 24Kb
static char lastFilename[WLED_MAX_SEGNAME_LEN+2] = "/"; // enough space for "/" + seg.name + '\0'
static GifDecoder<320,320,12,true> decoder; // this creates the basic object; parameter lzwMaxBits is not used; decoder.alloc() always allocates "everything else" = 24Kb
static bool gifDecodeFailed = false;
static unsigned long lastFrameDisplayTime = 0, currentFrameDelay = 0;
@@ -37,7 +42,7 @@ int fileSizeCallback(void) {
bool openGif(const char *filename) { // side-effect: updates "file"
file = WLED_FS.open(filename, "r");
DEBUG_PRINTF("opening GIF file %s\n", filename);
USER_PRINTF("opening GIF file %s\n", filename);
if (!file) return false;
return true;
@@ -47,37 +52,56 @@ static Segment* activeSeg;
static uint16_t gifWidth, gifHeight; // these two must stay uint16_t, because they are passed by reference
static unsigned segCols = 1;
static unsigned segRows = 1;
//static unsigned segLen = 1; // for future 1D support
static int expandX = 1;
static int expandY = 1;
static int lastX = -1, lastY = -1;
static unsigned segLen = 1; // for 1D and 1DExpand support
static int lastCoordinate = -1; // last coordinate (x+y) that was set, used to reduce redundant pixel writes
static unsigned perPixelX, perPixelY; // scaling factors when upscaling
void screenClearCallback(void) {
activeSeg->fill(0);
}
// this callback runs when the decoder has finished painting all pixels
void updateScreenCallback(void) {
// this callback runs when the decoder has finished painting all pixels
// perfect time for adding blur
if (activeSeg->intensity > 1) {
uint8_t blurAmount = activeSeg->intensity >> 2;
if ((blurAmount < 24) && (activeSeg->is2D())) activeSeg->blurRows(activeSeg->intensity >> 1); // some blur - fast
else activeSeg->blur(blurAmount); // more blur - slower
uint8_t blurAmount = activeSeg->intensity >> 1;
if ((blurAmount < 48) && (activeSeg->is2D())) activeSeg->blurRows(activeSeg->intensity); // some blur - fast
else activeSeg->blur(blurAmount); // more blur - slower
}
lastX = lastY = -1; // invalidate last position
lastCoordinate = -1; // invalidate last position
}
void draw2DPixelCallback(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue) {
// simple nearest-neighbor downscaling
int outY = y * segRows / gifHeight;
int outX = x * segCols / gifWidth;
if ((unsigned(outX) >= segCols) || (unsigned(outY) >= segRows)) return; // out of range
if ((lastX == outX) && (lastY == outY)) return; // downscaling optimization: skip re-painting same pixel
lastX = outX; lastY = outY;
// set multiple pixels if upscaling
// softhack007: changed loop x/y order -> minor speedup from better cache locality
for (int j = 0; j < expandY; j++) {
for (int i = 0; i < expandX; i++) {
// note: GifDecoder drawing is done top right to bottom left, line by line
// callbacks to draw a pixel at (x,y) without scaling: used if GIF size matches (virtual)segment size (faster) works for 1D and 2D segments
void drawPixelCallbackNoScale1D(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue) {
activeSeg->setPixelColor(y * gifWidth + x, gamma8(red), gamma8(green), gamma8(blue));
}
void drawPixelCallbackNoScale2D(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue) { // WLEDMM setPixelColorXY is faster in our fork
activeSeg->setPixelColorXY(x, y, gamma8(red), gamma8(green), gamma8(blue));
}
void drawPixelCallback1D(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue) {
// 1D strip: load pixel-by-pixel left to right, top to bottom (0/0 = top-left in gifs)
int totalImgPix = (int)gifWidth * gifHeight;
int start = ((int)y * gifWidth + (int)x) * segLen / totalImgPix; // simple nearest-neighbor scaling
if (start == lastCoordinate) return; // skip setting same coordinate again
lastCoordinate = start;
for (int i = 0; i < perPixelX; i++) {
activeSeg->setPixelColor(start + i, gamma8(red), gamma8(green), gamma8(blue));
}
}
void drawPixelCallback2D(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue) {
// simple nearest-neighbor scaling
int outY = (int)y * segRows / gifHeight;
int outX = (int)x * segCols / gifWidth;
// Pack coordinates uniquely: outY into upper 16 bits, outX into lower 16 bits
if (((outY << 16) | outX) == lastCoordinate) return; // skip setting same coordinate again
lastCoordinate = (outY << 16) | outX; // since input is a "scanline" this is sufficient to identify a "unique" coordinate
// set multiple pixels if upscaling // softhack007: changed loop x/y order -> minor speedup from better cache locality
for (int j = 0; j < perPixelY; j++) {
for (int i = 0; i < perPixelX; i++) {
activeSeg->setPixelColorXY(outX + i, outY + j, gamma8(red), gamma8(green), gamma8(blue));
}
}
@@ -98,16 +122,18 @@ void draw2DPixelCallback(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8
byte renderImageToSegment(Segment &seg) {
if (!seg.name) return IMAGE_ERROR_NO_NAME;
// disable during effect transition, causes flickering, multiple allocations and depending on image, part of old FX remaining
// TODO: if (seg.mode != seg.currentMode()) return IMAGE_ERROR_WAITING;
//if (seg.mode != seg.currentMode()) return IMAGE_ERROR_WAITING;
if (activeSeg && activeSeg != &seg) return IMAGE_ERROR_SEG_LIMIT; // only one segment at a time
activeSeg = &seg;
segCols = activeSeg->virtualWidth();
segRows = activeSeg->virtualHeight();
// segLen = activeSeg->virtualLength(); // for future 1D and expand1D support
segLen = activeSeg->calc_virtualLength();
if (strncmp(lastFilename +1, seg.name, 32) != 0) { // segment name changed, load new image
strncpy(lastFilename +1, seg.name, 32);
lastFilename[33] = '\0'; // make sure that lastFilename is always null-terminated
if (strncmp(lastFilename +1, seg.name, WLED_MAX_SEGNAME_LEN) != 0) { // segment name changed, load new image
strcpy(lastFilename, "/"); // filename always starts with '/'
strncpy(lastFilename +1, seg.name, WLED_MAX_SEGNAME_LEN);
lastFilename[WLED_MAX_SEGNAME_LEN+1] ='\0'; // ensure proper string termination when segment name was truncated
gifDecodeFailed = false;
size_t fnameLen = strlen(lastFilename);
if ((fnameLen < 4) || strcmp(lastFilename + fnameLen - 4, ".gif") != 0) { // empty segment name, name too short, or name not ending in .gif
@@ -116,45 +142,69 @@ byte renderImageToSegment(Segment &seg) {
return IMAGE_ERROR_UNSUPPORTED_FORMAT;
}
if (file) file.close();
if (!openGif(lastFilename)) {
gifDecodeFailed = true;
gifDecodeFailed = true;
USER_PRINTF("GIF file not found: %s\n", lastFilename);
return IMAGE_ERROR_FILE_MISSING;
return IMAGE_ERROR_FILE_MISSING;
}
lastCoordinate = -1;
decoder.setScreenClearCallback(screenClearCallback);
decoder.setUpdateScreenCallback(updateScreenCallback);
decoder.setDrawPixelCallback(draw2DPixelCallback);
decoder.setDrawPixelCallback(drawPixelCallbackNoScale1D); // default: use "fast path" callback without scaling
decoder.setFileSeekCallback(fileSeekCallback);
decoder.setFilePositionCallback(filePositionCallback);
decoder.setFileReadCallback(fileReadCallback);
decoder.setFileReadBlockCallback(fileReadBlockCallback);
decoder.setFileSizeCallback(fileSizeCallback);
#if __cpp_exceptions // use exception handler if we can (some targets don't support exceptions)
try {
try {
#endif
decoder.alloc(); // WLEDMM this function may throw out-of memory and cause a crash
decoder.alloc(); // this function may throw out-of memory and cause a crash
#if __cpp_exceptions
} catch (...) { // if we arrive here, the decoder has thrown an OOM exception
gifDecodeFailed = true;
errorFlag = ERR_NORAM_PX;
USER_PRINTLN("\nGIF decoder out of memory. Please try a smaller image file.\n");
USER_PRINTLN(F("\nGIF decoder out of memory. Please try a smaller image file.\n"));
//USER_PRINTLN("I'm going to shoot myself now.");
return IMAGE_ERROR_DECODER_ALLOC;
// decoder cleanup (hi @coderabbitai): No additonal cleanup necessary - decoder.alloc() ultimately uses "new AnimatedGIF".
// If new throws, no pointer is assigned, previous decoder state (if any) has already been deleted inside alloc(), so calling decoder.dealloc() here is unnecessary.
}
#endif
DEBUG_PRINTLN(F("Starting decoding"));
int derr = 0;
if((derr = decoder.startDecoding()) < 0) {
int decoderError = decoder.startDecoding();
if(decoderError < 0) {
USER_PRINTF("GIF Decoding error %d in startDecoding().\n", decoderError);
errorFlag = ERR_NORAM_PX;
gifDecodeFailed = true;
USER_PRINTF("GIF Decoding error %d\n", derr);
if ((derr == ERROR_GIF_TOO_WIDE) || (derr == ERROR_GIF_UNSUPPORTED_FEATURE) || (derr == ERROR_GIF_INVALID_PARAMETER))
errorFlag = ERR_NORAM_PX;
return IMAGE_ERROR_GIF_DECODE;
return IMAGE_ERROR_GIF_DECODE;
}
if ((errorFlag == ERR_NORAM_PX) || (errorFlag == ERR_NORAM)) errorFlag = ERR_NONE; // success -> reset previous memory error codes
DEBUG_PRINTLN(F("Decoding started"));
// after startDecoding, we can get GIF size, update static variables and callbacks
decoder.getSize(&gifWidth, &gifHeight);
if (gifWidth == 0 || gifHeight == 0) { // bad gif size: prevent division by zero
gifDecodeFailed = true;
USER_PRINTF("Invalid GIF dimensions: %dx%d\n", gifWidth, gifHeight);
return IMAGE_ERROR_GIF_DECODE;
}
if (activeSeg->is2D()) {
perPixelX = (segCols + gifWidth -1) / gifWidth;
perPixelY = (segRows + gifHeight-1) / gifHeight;
if (segCols != gifWidth || segRows != gifHeight) {
decoder.setDrawPixelCallback(drawPixelCallback2D); // use 2D callback with scaling
//DEBUG_PRINTLN(F("scaling image"));
} else {
decoder.setDrawPixelCallback(drawPixelCallbackNoScale2D); // use 2D callback without scaling
}
} else {
int totalImgPix = (int)gifWidth * gifHeight;
if (totalImgPix - segLen == 1) totalImgPix--; // handle off-by-one: skip last pixel instead of first (gifs constructed from 1D input pad last pixel if length is odd)
perPixelX = (segLen + totalImgPix-1) / totalImgPix;
if (totalImgPix != segLen) {
decoder.setDrawPixelCallback(drawPixelCallback1D); // use 1D callback with scaling
//DEBUG_PRINTLN(F("scaling image"));
}
}
}
if (gifDecodeFailed) return IMAGE_ERROR_PREV;
@@ -168,23 +218,12 @@ byte renderImageToSegment(Segment &seg) {
// TODO consider handling this on FX level with a different frametime, but that would cause slow gifs to speed up during transitions
if (millis() - lastFrameDisplayTime < wait) return IMAGE_ERROR_WAITING;
decoder.getSize(&gifWidth, &gifHeight);
// bad gif size: prevent division by zero
if (gifWidth == 0 || gifHeight == 0) {
gifDecodeFailed = true;
USER_PRINTF("Invalid GIF dimensions: %dx%d\n", gifWidth, gifHeight);
return IMAGE_ERROR_GIF_DECODE;
}
// softhack007: pre-calculate upscaling for speedup
expandX = (segCols+(gifWidth-1)) / gifWidth;
expandY = (segRows+(gifHeight-1)) / gifHeight;
int result = decoder.decodeFrame(false);
if (result < 0) {
USER_PRINTF("GIF Decoding error %d in decodeFrame().\n", result);
gifDecodeFailed = true;
USER_PRINTF("GIF Frame decode failed %d\n", result);
return IMAGE_ERROR_FRAME_DECODE;
}
}
currentFrameDelay = decoder.getFrameDelay_ms();
unsigned long tooSlowBy = (millis() - lastFrameDisplayTime) - wait; // if last frame was longer than intended, compensate
@@ -201,7 +240,7 @@ void endImagePlayback(Segment *seg) {
decoder.dealloc();
gifDecodeFailed = false;
activeSeg = nullptr;
lastFilename[1] = '\0';
strcpy(lastFilename, "/"); // reset filename
DEBUG_PRINTLN(F("Image playback ended"));
}