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-rw-r--r--src/blitter/32bpp_base.cpp52
-rw-r--r--src/blitter/32bpp_base.hpp1
-rw-r--r--src/blitter/8bpp_base.cpp52
-rw-r--r--src/blitter/8bpp_base.hpp1
-rw-r--r--src/blitter/base.hpp12
-rw-r--r--src/blitter/null.hpp1
6 files changed, 119 insertions, 0 deletions
diff --git a/src/blitter/32bpp_base.cpp b/src/blitter/32bpp_base.cpp
index adfc0fbef..f788b56a7 100644
--- a/src/blitter/32bpp_base.cpp
+++ b/src/blitter/32bpp_base.cpp
@@ -121,6 +121,58 @@ void Blitter_32bppBase::MoveBuffer(void *video_dst, const void *video_src, int w
}
}
+void Blitter_32bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
+{
+ const uint32 *src;
+ uint32 *dst;
+
+ if (scroll_y > 0) {
+ /*Calculate pointers */
+ dst = (uint32 *)video + left + (top + height - 1) * _screen.pitch;
+ src = dst - scroll_y * _screen.pitch;
+
+ /* Decrease height and increase top */
+ top += scroll_y;
+ height -= scroll_y;
+ assert(height > 0);
+
+ /* Adjust left & width */
+ if (scroll_x >= 0) {
+ dst += scroll_x;
+ left += scroll_x;
+ width -= scroll_x;
+ } else {
+ src -= scroll_x;
+ width += scroll_x;
+ }
+
+ /* Negative height as we want to copy from bottom to top */
+ this->CopyFromBuffer(dst, src, width, -height, _screen.pitch);
+ } else {
+ /* Calculate pointers */
+ dst = (uint32 *)video + left + top * _screen.pitch;
+ src = dst - scroll_y * _screen.pitch;
+
+ /* Decrese height. (scroll_y is <=0). */
+ height += scroll_y;
+ assert(height > 0);
+
+ /* Adjust left & width */
+ if (scroll_x >= 0) {
+ dst += scroll_x;
+ left += scroll_x;
+ width -= scroll_x;
+ } else {
+ src -= scroll_x;
+ width += scroll_x;
+ }
+
+ /* the y-displacement may be 0 therefore we have to use memmove,
+ * because source and destination may overlap */
+ this->MoveBuffer(dst, src, width, height);
+ }
+}
+
int Blitter_32bppBase::BufferSize(int width, int height)
{
return width * height * sizeof(uint32);
diff --git a/src/blitter/32bpp_base.hpp b/src/blitter/32bpp_base.hpp
index df593247c..0149330d8 100644
--- a/src/blitter/32bpp_base.hpp
+++ b/src/blitter/32bpp_base.hpp
@@ -21,6 +21,7 @@ public:
/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch);
/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height);
+ /* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
/* virtual */ int BufferSize(int width, int height);
static inline uint32 LookupColourInPalette(uint8 index) {
diff --git a/src/blitter/8bpp_base.cpp b/src/blitter/8bpp_base.cpp
index 65de3b195..0a2ca6b52 100644
--- a/src/blitter/8bpp_base.cpp
+++ b/src/blitter/8bpp_base.cpp
@@ -126,6 +126,58 @@ void Blitter_8bppBase::MoveBuffer(void *video_dst, const void *video_src, int wi
}
}
+void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
+{
+ const uint8 *src;
+ uint8 *dst;
+
+ if (scroll_y > 0) {
+ /*Calculate pointers */
+ dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch;
+ src = dst - scroll_y * _screen.pitch;
+
+ /* Decrease height and increase top */
+ top += scroll_y;
+ height -= scroll_y;
+ assert(height > 0);
+
+ /* Adjust left & width */
+ if (scroll_x >= 0) {
+ dst += scroll_x;
+ left += scroll_x;
+ width -= scroll_x;
+ } else {
+ src -= scroll_x;
+ width += scroll_x;
+ }
+
+ /* Negative height as we want to copy from bottom to top */
+ this->CopyFromBuffer(dst, src, width, -height, _screen.pitch);
+ } else {
+ /* Calculate pointers */
+ dst = (uint8 *)video + left + top * _screen.pitch;
+ src = dst - scroll_y * _screen.pitch;
+
+ /* Decrese height. (scroll_y is <=0). */
+ height += scroll_y;
+ assert(height > 0);
+
+ /* Adjust left & width */
+ if (scroll_x >= 0) {
+ dst += scroll_x;
+ left += scroll_x;
+ width -= scroll_x;
+ } else {
+ src -= scroll_x;
+ width += scroll_x;
+ }
+
+ /* the y-displacement may be 0 therefore we have to use memmove,
+ * because source and destination may overlap */
+ this->MoveBuffer(dst, src, width, height);
+ }
+}
+
int Blitter_8bppBase::BufferSize(int width, int height)
{
return width * height;
diff --git a/src/blitter/8bpp_base.hpp b/src/blitter/8bpp_base.hpp
index 3e93885c7..3b313bb30 100644
--- a/src/blitter/8bpp_base.hpp
+++ b/src/blitter/8bpp_base.hpp
@@ -21,6 +21,7 @@ public:
/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch);
/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height);
+ /* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
/* virtual */ int BufferSize(int width, int height);
};
diff --git a/src/blitter/base.hpp b/src/blitter/base.hpp
index 6e59f4e2e..90e1dde03 100644
--- a/src/blitter/base.hpp
+++ b/src/blitter/base.hpp
@@ -139,6 +139,18 @@ public:
virtual void MoveBuffer(void *video_dst, const void *video_src, int width, int height) = 0;
/**
+ * Scroll the videobuffer some 'x' and 'y' value.
+ * @param video The buffer to scroll into.
+ * @param left The left value of the screen to scroll.
+ * @param top The top value of the screen to scroll.
+ * @param width The width of the screen to scroll.
+ * @param height The height of the screen to scroll.
+ * @param scroll_x How much to scroll in X.
+ * @param scroll_y How much to scroll in Y.
+ */
+ virtual void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) = 0;
+
+ /**
* Calculate how much memory there is needed for an image of this size in the video-buffer.
* @param width The width of the buffer-to-be.
* @param height The height of the buffer-to-be.
diff --git a/src/blitter/null.hpp b/src/blitter/null.hpp
index 61c4f222d..6c519b023 100644
--- a/src/blitter/null.hpp
+++ b/src/blitter/null.hpp
@@ -22,6 +22,7 @@ public:
/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch) {};
/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) {};
/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height) {};
+ /* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) {};
/* virtual */ int BufferSize(int width, int height) { return 0; };
};
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-12-04 20:33:39 +0000