mirror of
https://github.com/webmproject/libwebp.git
synced 2024-12-25 05:08:21 +01:00
* handle offset in anim viewer 'vwebp'
* fix gif2webp to handle disposal method and odd offset correctly + remove -scale and -crop option from vwebp, since it'll be broken with offsets and fragments. Needs a revisit. + remove a warning in gif2web Change-Id: If04c6d085806e32540f2f15a37244c4407b719b3
This commit is contained in:
skal
parent
118cb31270
commit
68f282f79c
@ -41,7 +41,15 @@ static int MyReader(GifFileType* gif, GifByteType* buffer, int length) {
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return fread(buffer, 1, length, file);
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}
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static void Remap(const uint8_t* const src, GifFileType* const gif,
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static void ClearPicture(WebPPicture* const picture, uint32_t color) {
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int x, y;
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for (y = 0; y < picture->height; ++y) {
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uint32_t* const dst = picture->argb + y * picture->argb_stride;
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for (x = 0; x < picture->width; ++x) dst[x] = color;
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}
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}
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static void Remap(const uint8_t* const src, const GifFileType* const gif,
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uint32_t* dst, int len) {
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int i;
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const GifColorType* colors;
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@ -97,6 +105,9 @@ static int ReadSubImage(GifFileType* gif, WebPPicture* pic, WebPPicture* view) {
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Remap(tmp, gif, dst + y * view->argb_stride, sub_w);
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}
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}
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// re-align the view with even offset (and adjust dimensions if needed).
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WebPPictureView(pic, offset_x & ~1, offset_y & ~1,
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sub_w + (offset_x & 1), sub_h + (offset_y & 1), view);
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ok = 1;
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End:
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@ -161,10 +172,9 @@ int main(int argc, const char *argv[]) {
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WebPPicture picture;
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WebPPicture view;
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WebPMemoryWriter memory;
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WebPMuxFrameInfo frame = {
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{NULL, 0}, 0, 0, 100, WEBP_CHUNK_ANMF, WEBP_MUX_DISPOSE_NONE
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};
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WebPMuxFrameInfo frame;
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WebPMuxAnimParams anim = { WHITE_COLOR, 0 };
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int done;
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int c;
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int quiet = 0;
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@ -172,6 +182,10 @@ int main(int argc, const char *argv[]) {
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WebPMux* mux = NULL;
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WebPData webp_data = { NULL, 0 };
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memset(&frame, 0, sizeof(frame));
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frame.id = WEBP_CHUNK_ANMF;
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frame.dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
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if (!WebPConfigInit(&config) || !WebPPictureInit(&picture)) {
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fprintf(stderr, "Error! Version mismatch!\n");
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return -1;
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@ -242,12 +256,14 @@ int main(int argc, const char *argv[]) {
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picture.writer = WebPMemoryWrite;
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picture.custom_ptr = &memory;
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if (!WebPPictureAlloc(&picture)) goto End;
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if (gif->SColorMap != NULL &&
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!GetColorFromIndex(gif->SColorMap, gif->SBackGroundColor,
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&anim.bgcolor)) {
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fprintf(stderr, "GIF decode error: invalid background color index.\n");
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goto End;
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}
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ClearPicture(&picture, anim.bgcolor);
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mux = WebPMuxNew();
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if (mux == NULL) {
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@ -263,11 +279,13 @@ int main(int argc, const char *argv[]) {
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switch (type) {
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case IMAGE_DESC_RECORD_TYPE: {
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if (frame.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
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ClearPicture(&picture, anim.bgcolor);
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}
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if (!DGifGetImageDesc(gif)) goto End;
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if (!ReadSubImage(gif, &picture, &view)) goto End;
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frame.x_offset = gif->Image.Left;
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frame.y_offset = gif->Image.Top;
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WebPMemoryWriterInit(&memory);
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if (!config.lossless) {
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// We need to call BGRA variant because of the way we do Remap().
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@ -284,18 +302,27 @@ int main(int argc, const char *argv[]) {
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fprintf(stderr, "Error code: %d\n", view.error_code);
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goto End;
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}
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frame.bitstream.bytes = memory.mem;
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frame.bitstream.size = memory.size;
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// Now we have all the info about the frame, as a Graphic Control
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// Extension Block always appears before the Image Descriptor Block.
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// So add the frame to mux.
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frame.x_offset = gif->Image.Left & ~1;
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frame.y_offset = gif->Image.Top & ~1;
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frame.bitstream.bytes = memory.mem;
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frame.bitstream.size = memory.size;
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err = WebPMuxPushFrame(mux, &frame, 1);
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if (err != WEBP_MUX_OK) {
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fprintf(stderr, "ERROR (%s): Could not add animation frame.\n",
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ErrorString(err));
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goto End;
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}
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if (verbose) {
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fprintf(stderr, "Added frame %dx%d (offset:%d,%d duration:%d) ",
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view.width, view.height, frame.x_offset, frame.y_offset,
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frame.duration);
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fprintf(stderr, "dispose:%d transparent index:%d\n",
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frame.dispose_method, transparent_index);
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}
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WebPDataClear(&frame.bitstream);
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break;
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}
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@ -315,8 +342,16 @@ int main(int argc, const char *argv[]) {
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const int delay = data[2] | (data[3] << 8); // In 10 ms units.
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if (data[0] != 4) goto End;
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frame.duration = delay * 10; // Duration is in 1 ms units for WebP.
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frame.dispose_method = (dispose == 0) ?
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WEBP_MUX_DISPOSE_NONE : WEBP_MUX_DISPOSE_BACKGROUND;
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if (dispose == 3) {
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fprintf(stderr, "WARNING: GIF_DISPOSE_RESTORE not supported.");
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// failsafe. TODO(urvang): emulate the correct behaviour by
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// recoding the whole frame.
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frame.dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
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} else {
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frame.dispose_method =
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(dispose == 2) ? WEBP_MUX_DISPOSE_BACKGROUND
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: WEBP_MUX_DISPOSE_NONE;
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}
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transparent_index = (flags & GIF_TRANSPARENT_MASK) ? data[4] : -1;
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break;
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}
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115
examples/vwebp.c
115
examples/vwebp.c
@ -46,7 +46,9 @@ static struct {
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int decoding_error;
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int print_info;
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int canvas_width, canvas_height;
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int loop_count;
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uint32_t bg_color;
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const char* file_name;
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WebPData data;
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@ -106,6 +108,10 @@ static void PrintString(const char* const text) {
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}
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}
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static float GetColorf(uint32_t color, int shift) {
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return (color >> shift) / 255.f;
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}
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static void DrawCheckerBoard(void) {
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const int square_size = 8; // must be a power of 2
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int x, y;
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@ -127,15 +133,20 @@ static void DrawCheckerBoard(void) {
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}
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static void HandleDisplay(void) {
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const WebPDecBuffer* pic = kParams.pic;
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const WebPDecBuffer* const pic = kParams.pic;
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const WebPIterator* const iter = &kParams.frameiter;
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double xoff, yoff;
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if (pic == NULL) return;
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glPixelZoom(1, -1);
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glRasterPos2f(-1, 1);
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xoff = 2. * iter->x_offset / kParams.canvas_width;
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yoff = 2. * iter->y_offset / kParams.canvas_height;
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glRasterPos2f(-1. + xoff, 1. - yoff);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, pic->u.RGBA.stride / 4);
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DrawCheckerBoard();
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if (iter->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
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glClear(GL_COLOR_BUFFER_BIT); // use clear color
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}
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glDrawPixels(pic->width, pic->height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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(GLvoid*)pic->u.RGBA.rgba);
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@ -150,45 +161,53 @@ static void HandleDisplay(void) {
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glColor4f(0.0, 0.0, 0.0, 1.0);
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glRasterPos2f(-0.95f, 0.80f);
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PrintString(tmp);
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if (iter->x_offset != 0 || iter->y_offset != 0) {
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snprintf(tmp, sizeof(tmp), " (offset:%d,%d)",
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iter->x_offset, iter->y_offset);
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glRasterPos2f(-0.95f, 0.70f);
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PrintString(tmp);
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}
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}
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glPopMatrix();
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glFlush();
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}
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static void StartDisplay(const WebPDecBuffer* const pic) {
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static void StartDisplay(void) {
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const int width = kParams.canvas_width;
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const int height = kParams.canvas_height;
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glutInitDisplayMode(GLUT_RGBA);
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glutInitWindowSize(pic->width, pic->height);
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glutInitWindowSize(width, height);
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glutCreateWindow("WebP viewer");
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glutDisplayFunc(HandleDisplay);
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glutIdleFunc(NULL);
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glutKeyboardFunc(HandleKey);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable(GL_BLEND);
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glClearColor(0.0, 0.0, 0.0, 0.0);
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HandleReshape(pic->width, pic->height);
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glClearColor(GetColorf(kParams.bg_color, 0),
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GetColorf(kParams.bg_color, 8),
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GetColorf(kParams.bg_color, 16),
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GetColorf(kParams.bg_color, 24));
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HandleReshape(width, height);
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glClear(GL_COLOR_BUFFER_BIT);
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DrawCheckerBoard();
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}
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//------------------------------------------------------------------------------
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// File decoding
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static int Decode(int* const duration) {
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static int Decode(void) { // Fills kParams.frameiter
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const WebPIterator* const iter = &kParams.frameiter;
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WebPDecoderConfig* const config = kParams.config;
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WebPDecBuffer* const output_buffer = &config->output;
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int ok = 0;
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ClearPreviousPic();
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if (iter->x_offset != 0 || iter->y_offset != 0) {
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fprintf(stderr,
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"Frame offsets not yet supported! Forcing offset to 0,0\n");
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}
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output_buffer->colorspace = MODE_RGBA;
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ok = (WebPDecode(iter->fragment.bytes, iter->fragment.size,
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config) == VP8_STATUS_OK);
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if (!ok) {
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fprintf(stderr, "Decoding of frame #%d failed!\n", iter->frame_num);
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} else {
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*duration = iter->duration;
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kParams.pic = output_buffer;
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}
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return ok;
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@ -198,25 +217,27 @@ static void decode_callback(int what) {
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if (what == 0 && !kParams.done) {
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int duration = 0;
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if (kParams.dmux != NULL) {
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if (!Decode(&duration)) {
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kParams.decoding_error = 1;
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kParams.done = 1;
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} else {
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WebPIterator* const iter = &kParams.frameiter;
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if (!WebPDemuxNextFrame(iter)) {
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WebPDemuxReleaseIterator(iter);
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if (WebPDemuxGetFrame(kParams.dmux, 1, iter)) {
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--kParams.loop_count;
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kParams.done = (kParams.loop_count == 0);
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} else {
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kParams.decoding_error = 1;
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kParams.done = 1;
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}
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WebPIterator* const iter = &kParams.frameiter;
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if (!WebPDemuxNextFrame(iter)) {
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WebPDemuxReleaseIterator(iter);
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if (WebPDemuxGetFrame(kParams.dmux, 1, iter)) {
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--kParams.loop_count;
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kParams.done = (kParams.loop_count == 0);
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} else {
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kParams.decoding_error = 1;
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kParams.done = 1;
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return;
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}
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}
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duration = iter->duration;
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}
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if (!Decode()) {
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kParams.decoding_error = 1;
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kParams.done = 1;
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} else {
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glutPostRedisplay();
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glutTimerFunc(duration, decode_callback, what);
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}
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glutPostRedisplay();
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glutTimerFunc(duration, decode_callback, what);
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}
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}
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@ -231,8 +252,7 @@ static void Help(void) {
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" -nofancy ..... don't use the fancy YUV420 upscaler.\n"
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" -nofilter .... disable in-loop filtering.\n"
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" -mt .......... use multi-threading\n"
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" -crop <x> <y> <w> <h> ... crop output with the given rectangle\n"
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" -scale <w> <h> .......... scale the output (*after* any cropping)\n"
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" -info ........ print info.\n"
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" -h ....... this help message.\n"
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);
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}
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@ -255,6 +275,8 @@ int main(int argc, char *argv[]) {
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config.options.no_fancy_upsampling = 1;
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} else if (!strcmp(argv[c], "-nofilter")) {
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config.options.bypass_filtering = 1;
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} else if (!strcmp(argv[c], "-info")) {
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kParams.print_info = 1;
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} else if (!strcmp(argv[c], "-version")) {
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const int version = WebPGetDecoderVersion();
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printf("%d.%d.%d\n",
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@ -262,16 +284,6 @@ int main(int argc, char *argv[]) {
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return 0;
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} else if (!strcmp(argv[c], "-mt")) {
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config.options.use_threads = 1;
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} else if (!strcmp(argv[c], "-crop") && c < argc - 4) {
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config.options.use_cropping = 1;
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config.options.crop_left = strtol(argv[++c], NULL, 0);
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config.options.crop_top = strtol(argv[++c], NULL, 0);
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config.options.crop_width = strtol(argv[++c], NULL, 0);
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config.options.crop_height = strtol(argv[++c], NULL, 0);
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} else if (!strcmp(argv[c], "-scale") && c < argc - 2) {
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config.options.use_scaling = 1;
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config.options.scaled_width = strtol(argv[++c], NULL, 0);
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config.options.scaled_height = strtol(argv[++c], NULL, 0);
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} else if (argv[c][0] == '-') {
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printf("Unknown option '%s'\n", argv[c]);
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Help();
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@ -302,26 +314,35 @@ int main(int argc, char *argv[]) {
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fprintf(stderr, "Image fragments are not supported for now!\n");
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goto Error;
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}
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kParams.canvas_width = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_WIDTH);
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kParams.canvas_height = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_HEIGHT);
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if (kParams.print_info) {
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printf("Canvas: %d x %d\n", kParams.canvas_width, kParams.canvas_height);
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}
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if (!WebPDemuxGetFrame(kParams.dmux, 1, &kParams.frameiter)) goto Error;
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kParams.has_animation = (kParams.frameiter.num_frames > 1);
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kParams.loop_count = (int)WebPDemuxGetI(kParams.dmux, WEBP_FF_LOOP_COUNT);
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kParams.bg_color = WebPDemuxGetI(kParams.dmux, WEBP_FF_BACKGROUND_COLOR);
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printf("VP8X: Found %d images in file (loop count = %d)\n",
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kParams.frameiter.num_frames, kParams.loop_count);
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// Decode first frame
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{
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int duration;
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if (!Decode(&duration)) goto Error;
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}
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if (!Decode()) goto Error;
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// Position iterator to last frame. Next call to HandleDisplay will wrap over.
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// We take this into account by bumping up loop_count.
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WebPDemuxGetFrame(kParams.dmux, 0, &kParams.frameiter);
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if (kParams.loop_count) ++kParams.loop_count;
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// Start display (and timer)
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glutInit(&argc, argv);
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#ifdef FREEGLUT
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glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION);
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#endif
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StartDisplay(kParams.pic);
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StartDisplay();
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if (kParams.has_animation) glutTimerFunc(0, decode_callback, 0);
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glutMainLoop();
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