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https://github.com/webmproject/libwebp.git
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use pointers for WebPRescaler's in WebPDecParams
This makes the structure more generic, without the hard-coded internal structure. This is a borderline incompatible ABI change, even if WebPIDecoder structure is opaque. Change-Id: I518765c3f76fc17a136cef045a5a8aa70ed70e85
This commit is contained in:
Pascal Massimino
parent
db013a8d5c
commit
9ed5e3e5dd
98
src/dec/io.c
98
src/dec/io.c
@ -256,7 +256,7 @@ static int Rescale(const uint8_t* src, int src_stride,
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static int EmitRescaledYUV(const VP8Io* const io, WebPDecParams* const p) {
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const int mb_h = io->mb_h;
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const int uv_mb_h = (mb_h + 1) >> 1;
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WebPRescaler* const scaler = &p->scaler_y;
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WebPRescaler* const scaler = p->scaler_y;
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int num_lines_out = 0;
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if (WebPIsAlphaMode(p->output->colorspace) && io->a != NULL) {
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// Before rescaling, we premultiply the luma directly into the io->y
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@ -267,8 +267,8 @@ static int EmitRescaledYUV(const VP8Io* const io, WebPDecParams* const p) {
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io->a, io->width, io->mb_w, mb_h, 0);
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}
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num_lines_out = Rescale(io->y, io->y_stride, mb_h, scaler);
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Rescale(io->u, io->uv_stride, uv_mb_h, &p->scaler_u);
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Rescale(io->v, io->uv_stride, uv_mb_h, &p->scaler_v);
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Rescale(io->u, io->uv_stride, uv_mb_h, p->scaler_u);
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Rescale(io->v, io->uv_stride, uv_mb_h, p->scaler_v);
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return num_lines_out;
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}
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@ -278,11 +278,11 @@ static int EmitRescaledAlphaYUV(const VP8Io* const io, WebPDecParams* const p,
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uint8_t* const dst_a = buf->a + p->last_y * buf->a_stride;
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if (io->a != NULL) {
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uint8_t* const dst_y = buf->y + p->last_y * buf->y_stride;
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const int num_lines_out = Rescale(io->a, io->width, io->mb_h, &p->scaler_a);
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const int num_lines_out = Rescale(io->a, io->width, io->mb_h, p->scaler_a);
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assert(expected_num_lines_out == num_lines_out);
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if (num_lines_out > 0) { // unmultiply the Y
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WebPMultRows(dst_y, buf->y_stride, dst_a, buf->a_stride,
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p->scaler_a.dst_width, num_lines_out, 1);
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p->scaler_a->dst_width, num_lines_out, 1);
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}
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} else if (buf->a != NULL) {
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// the user requested alpha, but there is none, set it to opaque.
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@ -304,31 +304,42 @@ static int InitYUVRescaler(const VP8Io* const io, WebPDecParams* const p) {
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const int uv_in_height = (io->mb_h + 1) >> 1;
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const size_t work_size = 2 * out_width; // scratch memory for luma rescaler
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const size_t uv_work_size = 2 * uv_out_width; // and for each u/v ones
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size_t tmp_size;
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size_t tmp_size, rescaler_size;
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rescaler_t* work;
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WebPRescaler* scalers;
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const int num_rescalers = has_alpha ? 4 : 3;
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tmp_size = (work_size + 2 * uv_work_size) * sizeof(*work);
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if (has_alpha) {
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tmp_size += work_size * sizeof(*work);
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}
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p->memory = WebPSafeMalloc(1ULL, tmp_size);
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rescaler_size = num_rescalers * sizeof(*p->scaler_y) + WEBP_ALIGN_CST;
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p->memory = WebPSafeMalloc(1ULL, tmp_size + rescaler_size);
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if (p->memory == NULL) {
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return 0; // memory error
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}
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work = (rescaler_t*)p->memory;
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WebPRescalerInit(&p->scaler_y, io->mb_w, io->mb_h,
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scalers = (WebPRescaler*)WEBP_ALIGN((const uint8_t*)work + tmp_size);
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p->scaler_y = &scalers[0];
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p->scaler_u = &scalers[1];
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p->scaler_v = &scalers[2];
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p->scaler_a = has_alpha ? &scalers[3] : NULL;
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WebPRescalerInit(p->scaler_y, io->mb_w, io->mb_h,
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buf->y, out_width, out_height, buf->y_stride, 1,
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work);
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WebPRescalerInit(&p->scaler_u, uv_in_width, uv_in_height,
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WebPRescalerInit(p->scaler_u, uv_in_width, uv_in_height,
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buf->u, uv_out_width, uv_out_height, buf->u_stride, 1,
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work + work_size);
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WebPRescalerInit(&p->scaler_v, uv_in_width, uv_in_height,
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WebPRescalerInit(p->scaler_v, uv_in_width, uv_in_height,
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buf->v, uv_out_width, uv_out_height, buf->v_stride, 1,
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work + work_size + uv_work_size);
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p->emit = EmitRescaledYUV;
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if (has_alpha) {
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WebPRescalerInit(&p->scaler_a, io->mb_w, io->mb_h,
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WebPRescalerInit(p->scaler_a, io->mb_w, io->mb_h,
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buf->a, out_width, out_height, buf->a_stride, 1,
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work + work_size + 2 * uv_work_size);
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p->emit_alpha = EmitRescaledAlphaYUV;
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@ -348,15 +359,15 @@ static int ExportRGB(WebPDecParams* const p, int y_pos) {
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int num_lines_out = 0;
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// For RGB rescaling, because of the YUV420, current scan position
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// U/V can be +1/-1 line from the Y one. Hence the double test.
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while (WebPRescalerHasPendingOutput(&p->scaler_y) &&
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WebPRescalerHasPendingOutput(&p->scaler_u)) {
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while (WebPRescalerHasPendingOutput(p->scaler_y) &&
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WebPRescalerHasPendingOutput(p->scaler_u)) {
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assert(y_pos + num_lines_out < p->output->height);
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assert(p->scaler_u.y_accum == p->scaler_v.y_accum);
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WebPRescalerExportRow(&p->scaler_y);
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WebPRescalerExportRow(&p->scaler_u);
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WebPRescalerExportRow(&p->scaler_v);
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convert(p->scaler_y.dst, p->scaler_u.dst, p->scaler_v.dst,
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dst, p->scaler_y.dst_width);
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assert(p->scaler_u->y_accum == p->scaler_v->y_accum);
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WebPRescalerExportRow(p->scaler_y);
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WebPRescalerExportRow(p->scaler_u);
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WebPRescalerExportRow(p->scaler_v);
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convert(p->scaler_y->dst, p->scaler_u->dst, p->scaler_v->dst,
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dst, p->scaler_y->dst_width);
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dst += buf->stride;
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++num_lines_out;
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}
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@ -370,15 +381,15 @@ static int EmitRescaledRGB(const VP8Io* const io, WebPDecParams* const p) {
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int num_lines_out = 0;
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while (j < mb_h) {
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const int y_lines_in =
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WebPRescalerImport(&p->scaler_y, mb_h - j,
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WebPRescalerImport(p->scaler_y, mb_h - j,
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io->y + j * io->y_stride, io->y_stride);
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j += y_lines_in;
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if (WebPRescaleNeededLines(&p->scaler_u, uv_mb_h - uv_j)) {
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if (WebPRescaleNeededLines(p->scaler_u, uv_mb_h - uv_j)) {
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const int u_lines_in =
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WebPRescalerImport(&p->scaler_u, uv_mb_h - uv_j,
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WebPRescalerImport(p->scaler_u, uv_mb_h - uv_j,
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io->u + uv_j * io->uv_stride, io->uv_stride);
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const int v_lines_in =
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WebPRescalerImport(&p->scaler_v, uv_mb_h - uv_j,
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WebPRescalerImport(p->scaler_v, uv_mb_h - uv_j,
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io->v + uv_j * io->uv_stride, io->uv_stride);
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(void)v_lines_in; // remove a gcc warning
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assert(u_lines_in == v_lines_in);
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@ -399,13 +410,13 @@ static int ExportAlpha(WebPDecParams* const p, int y_pos, int max_lines_out) {
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int num_lines_out = 0;
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const int is_premult_alpha = WebPIsPremultipliedMode(colorspace);
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uint32_t non_opaque = 0;
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const int width = p->scaler_a.dst_width;
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const int width = p->scaler_a->dst_width;
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while (WebPRescalerHasPendingOutput(&p->scaler_a) &&
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while (WebPRescalerHasPendingOutput(p->scaler_a) &&
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num_lines_out < max_lines_out) {
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assert(y_pos + num_lines_out < p->output->height);
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WebPRescalerExportRow(&p->scaler_a);
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non_opaque |= WebPDispatchAlpha(p->scaler_a.dst, 0, width, 1, dst, 0);
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WebPRescalerExportRow(p->scaler_a);
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non_opaque |= WebPDispatchAlpha(p->scaler_a->dst, 0, width, 1, dst, 0);
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dst += buf->stride;
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++num_lines_out;
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}
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@ -427,18 +438,18 @@ static int ExportAlphaRGBA4444(WebPDecParams* const p, int y_pos,
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#endif
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int num_lines_out = 0;
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const WEBP_CSP_MODE colorspace = p->output->colorspace;
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const int width = p->scaler_a.dst_width;
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const int width = p->scaler_a->dst_width;
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const int is_premult_alpha = WebPIsPremultipliedMode(colorspace);
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uint32_t alpha_mask = 0x0f;
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while (WebPRescalerHasPendingOutput(&p->scaler_a) &&
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while (WebPRescalerHasPendingOutput(p->scaler_a) &&
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num_lines_out < max_lines_out) {
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int i;
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assert(y_pos + num_lines_out < p->output->height);
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WebPRescalerExportRow(&p->scaler_a);
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WebPRescalerExportRow(p->scaler_a);
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for (i = 0; i < width; ++i) {
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// Fill in the alpha value (converted to 4 bits).
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const uint32_t alpha_value = p->scaler_a.dst[i] >> 4;
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const uint32_t alpha_value = p->scaler_a->dst[i] >> 4;
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alpha_dst[2 * i] = (alpha_dst[2 * i] & 0xf0) | alpha_value;
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alpha_mask &= alpha_value;
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}
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@ -454,7 +465,7 @@ static int ExportAlphaRGBA4444(WebPDecParams* const p, int y_pos,
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static int EmitRescaledAlphaRGB(const VP8Io* const io, WebPDecParams* const p,
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int expected_num_out_lines) {
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if (io->a != NULL) {
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WebPRescaler* const scaler = &p->scaler_a;
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WebPRescaler* const scaler = p->scaler_a;
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int lines_left = expected_num_out_lines;
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const int y_end = p->last_y + lines_left;
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while (lines_left > 0) {
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@ -476,7 +487,9 @@ static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
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const size_t work_size = 2 * out_width; // scratch memory for one rescaler
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rescaler_t* work; // rescalers work area
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uint8_t* tmp; // tmp storage for scaled YUV444 samples before RGB conversion
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size_t tmp_size1, tmp_size2, total_size;
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size_t tmp_size1, tmp_size2, total_size, rescaler_size;
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WebPRescaler* scalers;
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const int num_rescalers = has_alpha ? 4 : 3;
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tmp_size1 = 3 * work_size;
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tmp_size2 = 3 * out_width;
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@ -485,26 +498,35 @@ static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
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tmp_size2 += out_width;
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}
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total_size = tmp_size1 * sizeof(*work) + tmp_size2 * sizeof(*tmp);
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p->memory = WebPSafeMalloc(1ULL, total_size);
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rescaler_size = num_rescalers * sizeof(*p->scaler_y) + WEBP_ALIGN_CST;
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p->memory = WebPSafeMalloc(1ULL, total_size + rescaler_size);
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if (p->memory == NULL) {
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return 0; // memory error
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}
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work = (rescaler_t*)p->memory;
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tmp = (uint8_t*)(work + tmp_size1);
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WebPRescalerInit(&p->scaler_y, io->mb_w, io->mb_h,
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scalers = (WebPRescaler*)WEBP_ALIGN((const uint8_t*)work + total_size);
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p->scaler_y = &scalers[0];
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p->scaler_u = &scalers[1];
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p->scaler_v = &scalers[2];
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p->scaler_a = has_alpha ? &scalers[3] : NULL;
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WebPRescalerInit(p->scaler_y, io->mb_w, io->mb_h,
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tmp + 0 * out_width, out_width, out_height, 0, 1,
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work + 0 * work_size);
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WebPRescalerInit(&p->scaler_u, uv_in_width, uv_in_height,
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WebPRescalerInit(p->scaler_u, uv_in_width, uv_in_height,
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tmp + 1 * out_width, out_width, out_height, 0, 1,
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work + 1 * work_size);
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WebPRescalerInit(&p->scaler_v, uv_in_width, uv_in_height,
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WebPRescalerInit(p->scaler_v, uv_in_width, uv_in_height,
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tmp + 2 * out_width, out_width, out_height, 0, 1,
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work + 2 * work_size);
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p->emit = EmitRescaledRGB;
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WebPInitYUV444Converters();
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if (has_alpha) {
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WebPRescalerInit(&p->scaler_a, io->mb_w, io->mb_h,
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WebPRescalerInit(p->scaler_a, io->mb_w, io->mb_h,
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tmp + 3 * out_width, out_width, out_height, 0, 1,
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work + 3 * work_size);
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p->emit_alpha = EmitRescaledAlphaRGB;
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@ -38,8 +38,8 @@ struct WebPDecParams {
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int last_y; // coordinate of the line that was last output
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const WebPDecoderOptions* options; // if not NULL, use alt decoding features
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// rescalers
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WebPRescaler scaler_y, scaler_u, scaler_v, scaler_a;
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WebPRescaler* scaler_y, *scaler_u, *scaler_v, *scaler_a; // rescalers
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void* memory; // overall scratch memory for the output work.
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OutputFunc emit; // output RGB or YUV samples
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