base: add pixel_buffer.is_opaque
diff --git a/internal/cgen/base/image-public.h b/internal/cgen/base/image-public.h
index e6b49a7..44b9544 100644
--- a/internal/cgen/base/image-public.h
+++ b/internal/cgen/base/image-public.h
@@ -1297,6 +1297,7 @@
inline wuffs_base__status set_color_u32_fill_rect(
wuffs_base__rect_ie_u32 rect,
wuffs_base__color_u32_argb_premul color);
+ inline bool is_opaque();
#endif // __cplusplus
} wuffs_base__pixel_buffer;
@@ -1508,6 +1509,9 @@
wuffs_base__rect_ie_u32 rect,
wuffs_base__color_u32_argb_premul color);
+WUFFS_BASE__MAYBE_STATIC bool //
+wuffs_base__pixel_buffer__is_opaque(const wuffs_base__pixel_buffer* pb);
+
#ifdef __cplusplus
inline wuffs_base__status //
@@ -1567,6 +1571,11 @@
return wuffs_base__pixel_buffer__set_color_u32_fill_rect(this, rect, color);
}
+inline bool //
+wuffs_base__pixel_buffer::is_opaque() {
+ return wuffs_base__pixel_buffer__is_opaque(this);
+}
+
#endif // __cplusplus
// --------
diff --git a/internal/cgen/base/pixconv-submodule-regular.c b/internal/cgen/base/pixconv-submodule-regular.c
index 0ac5d17..1314602 100644
--- a/internal/cgen/base/pixconv-submodule-regular.c
+++ b/internal/cgen/base/pixconv-submodule-regular.c
@@ -485,6 +485,96 @@
return wuffs_base__make_status(NULL);
}
+WUFFS_BASE__MAYBE_STATIC bool //
+wuffs_base__pixel_buffer__is_opaque(const wuffs_base__pixel_buffer* pb) {
+ if (!pb) {
+ return false;
+ } else if (wuffs_base__pixel_format__transparency(
+ &pb->pixcfg.private_impl.pixfmt) ==
+ WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__OPAQUE) {
+ return true;
+ }
+
+ uint32_t w = pb->pixcfg.private_impl.width;
+ uint32_t h = pb->pixcfg.private_impl.height;
+ if ((w <= 0) || (h <= 0)) {
+ return true;
+ }
+ const wuffs_base__table_u8* p = &pb->private_impl.planes[0];
+
+ switch (pb->pixcfg.private_impl.pixfmt.repr) {
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+ case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY: {
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if (row[(4 * (size_t)x) + 3] != 0xFF) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE: {
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if ((row[(8 * (size_t)x) + 6] != 0xFF) ||
+ (row[(8 * (size_t)x) + 7] != 0xFF)) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ case WUFFS_BASE__PIXEL_FORMAT__YA_NONPREMUL: {
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if (row[(2 * (size_t)x) + 1] != 0xFF) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+ case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL: {
+ const uint8_t* palette = pb->private_impl.planes[3].ptr;
+ for (uint32_t i = 0; true; i++) {
+ if (i >= 256) {
+ return true;
+ } else if (palette[(4 * (size_t)i) + 3] != 0xFF) {
+ break;
+ }
+ }
+
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if (palette[(4 * (size_t)row[x]) + 3] != 0xFF) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ default:
+ break;
+ }
+ return false;
+}
+
// --------
WUFFS_BASE__MAYBE_STATIC uint8_t //
diff --git a/release/c/wuffs-unsupported-snapshot.c b/release/c/wuffs-unsupported-snapshot.c
index fa98f34..178bd20 100644
--- a/release/c/wuffs-unsupported-snapshot.c
+++ b/release/c/wuffs-unsupported-snapshot.c
@@ -5336,6 +5336,7 @@
inline wuffs_base__status set_color_u32_fill_rect(
wuffs_base__rect_ie_u32 rect,
wuffs_base__color_u32_argb_premul color);
+ inline bool is_opaque();
#endif // __cplusplus
} wuffs_base__pixel_buffer;
@@ -5547,6 +5548,9 @@
wuffs_base__rect_ie_u32 rect,
wuffs_base__color_u32_argb_premul color);
+WUFFS_BASE__MAYBE_STATIC bool //
+wuffs_base__pixel_buffer__is_opaque(const wuffs_base__pixel_buffer* pb);
+
#ifdef __cplusplus
inline wuffs_base__status //
@@ -5606,6 +5610,11 @@
return wuffs_base__pixel_buffer__set_color_u32_fill_rect(this, rect, color);
}
+inline bool //
+wuffs_base__pixel_buffer::is_opaque() {
+ return wuffs_base__pixel_buffer__is_opaque(this);
+}
+
#endif // __cplusplus
// --------
@@ -23792,6 +23801,96 @@
return wuffs_base__make_status(NULL);
}
+WUFFS_BASE__MAYBE_STATIC bool //
+wuffs_base__pixel_buffer__is_opaque(const wuffs_base__pixel_buffer* pb) {
+ if (!pb) {
+ return false;
+ } else if (wuffs_base__pixel_format__transparency(
+ &pb->pixcfg.private_impl.pixfmt) ==
+ WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__OPAQUE) {
+ return true;
+ }
+
+ uint32_t w = pb->pixcfg.private_impl.width;
+ uint32_t h = pb->pixcfg.private_impl.height;
+ if ((w <= 0) || (h <= 0)) {
+ return true;
+ }
+ const wuffs_base__table_u8* p = &pb->private_impl.planes[0];
+
+ switch (pb->pixcfg.private_impl.pixfmt.repr) {
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+ case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY: {
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if (row[(4 * (size_t)x) + 3] != 0xFF) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE: {
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if ((row[(8 * (size_t)x) + 6] != 0xFF) ||
+ (row[(8 * (size_t)x) + 7] != 0xFF)) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ case WUFFS_BASE__PIXEL_FORMAT__YA_NONPREMUL: {
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if (row[(2 * (size_t)x) + 1] != 0xFF) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
+ case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+ case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL: {
+ const uint8_t* palette = pb->private_impl.planes[3].ptr;
+ for (uint32_t i = 0; true; i++) {
+ if (i >= 256) {
+ return true;
+ } else if (palette[(4 * (size_t)i) + 3] != 0xFF) {
+ break;
+ }
+ }
+
+ for (uint32_t y = 0; y < h; y++) {
+ const uint8_t* row = p->ptr + (p->stride * (size_t)y);
+ for (uint32_t x = 0; x < w; x++) {
+ if (palette[(4 * (size_t)row[x]) + 3] != 0xFF) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ default:
+ break;
+ }
+ return false;
+}
+
// --------
WUFFS_BASE__MAYBE_STATIC uint8_t //
