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[Video/KMSDRM] Don't copy the cursor bitmap to the cursor GBM BO until we're showing it.

This commit is contained in:
Manuel Alfayate Corchete 2020-12-20 21:48:05 +01:00
parent 67e9132dd5
commit a8dbcab132
2 changed files with 97 additions and 56 deletions
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133
src/video/kmsdrm/SDL_kmsdrmmouse.c
View File

@ -98,20 +98,13 @@ KMSDRM_CreateDefaultCursor(void)
return SDL_CreateCursor(default_cdata, default_cmask, DEFAULT_CWIDTH, DEFAULT_CHEIGHT, DEFAULT_CHOTX, DEFAULT_CHOTY);
}
/* This simply copies over the cursor bitmap from the SDLSurface we receive to the
cursor GBM BO. Setting up the cursor plane, creating the cursor FB BO, etc.. is
done in KMSDRM_InitMouse(): when we get here. everything must be ready. */
/* This simply gets the cursor soft-buffer ready. We don't copy it to a GBO BO until ShowCursor()
because the cusor GBM BO (living in dispata) is destroyed and recreated when we recreate windows, etc. */
static SDL_Cursor *
KMSDRM_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
{
SDL_DisplayData *dispdata = (SDL_DisplayData *)SDL_GetDisplayDriverData(0);
KMSDRM_CursorData *curdata;
SDL_Cursor *cursor;
uint32_t bo_stride, pixel;
uint32_t *buffer = NULL;
size_t bufsize;
unsigned int i, j;
SDL_Cursor *cursor, *ret;
/* All code below assumes ARGB8888 format for the cursor surface,
like other backends do. Also, the GBM BO pixels have to be
@ -123,30 +116,30 @@ KMSDRM_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
cursor = (SDL_Cursor *) SDL_calloc(1, sizeof(*cursor));
if (!cursor) {
SDL_OutOfMemory();
return NULL;
ret = NULL;
goto cleanup;
}
curdata = (KMSDRM_CursorData *) SDL_calloc(1, sizeof(*curdata));
if (!curdata) {
SDL_OutOfMemory();
SDL_free(cursor);
return NULL;
ret = NULL;
goto cleanup;
}
/* hox_x and hot_y are the coordinates of the "tip of the cursor" from it's base. */
curdata->hot_x = hot_x;
curdata->hot_y = hot_y;
curdata->w = dispdata->cursor_w;
curdata->h = dispdata->cursor_h;
curdata->w = surface->w;
curdata->h = surface->h;
curdata->buffer = NULL;
bo_stride = KMSDRM_gbm_bo_get_stride(dispdata->cursor_bo);
bufsize = bo_stride * curdata->h;
/* Configure the cursor buffer info.
This buffer has the original size of the cursor surface we are given. */
curdata->buffer_pitch = surface->pitch;
curdata->buffer_size = surface->pitch * surface->h;
curdata->buffer = (uint32_t*)SDL_malloc(curdata->buffer_size);
/* Always use a temp buffer: it serves the purpose of storing the
alpha-premultiplied pixels (so we can copy them to the gbm BO
with a single gb_bo_write() call), and also copying from the
SDL surface, line by line, to a gbm BO with different pitch. */
buffer = (uint32_t*)SDL_malloc(bufsize);
if (!buffer) {
if (!curdata->buffer) {
SDL_OutOfMemory();
goto cleanup;
}
@ -158,38 +151,21 @@ KMSDRM_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
}
}
/* Clean the whole temporary buffer. */
SDL_memset(buffer, 0x00, bo_stride * curdata->h);
/* Copy from SDL surface to buffer, pre-multiplying by alpha each pixel as we go. */
for (i = 0; i < surface->h; i++) {
for (j = 0; j < surface->w; j++) {
pixel = ((uint32_t*)surface->pixels)[i * surface->w + j];
alpha_premultiply_ARGB8888 (&pixel);
SDL_memcpy(buffer + (i * curdata->w) + j, &pixel, 4);
}
}
/* Copy the surface pixels to the cursor buffer, for future use in ShowCursor() */
SDL_memcpy(curdata->buffer, surface->pixels, curdata->buffer_size);
if (SDL_MUSTLOCK(surface)) {
SDL_UnlockSurface(surface);
}
if (KMSDRM_gbm_bo_write(dispdata->cursor_bo, buffer, bufsize)) {
SDL_SetError("Could not write to GBM cursor BO");
goto cleanup;
}
/* Free temporary buffer */
SDL_free(buffer);
buffer = NULL;
cursor->driverdata = curdata;
return cursor;
ret = cursor;
cleanup:
if (buffer) {
SDL_free(buffer);
if (ret == NULL) {
if (curdata->buffer) {
SDL_free(curdata->buffer);
}
if (cursor) {
SDL_free(cursor);
@ -197,8 +173,9 @@ cleanup:
if (curdata) {
SDL_free(curdata);
}
}
return NULL;
return ret;
}
/* Show the specified cursor, or hide if cursor is NULL.
@ -218,6 +195,14 @@ KMSDRM_ShowCursor(SDL_Cursor * cursor)
KMSDRM_FBInfo *fb;
KMSDRM_PlaneInfo info = {0};
size_t bo_stride;
size_t bufsize;
uint32_t *ready_buffer = NULL;
uint32_t pixel;
int i,j;
int ret;
mouse = SDL_GetMouse();
if (!mouse) {
return SDL_SetError("No mouse.");
@ -268,8 +253,39 @@ KMSDRM_ShowCursor(SDL_Cursor * cursor)
return SDL_SetError("Cursor not initialized properly.");
}
/* Prepare a buffer we can dump to our GBM BO (different size, alpha premultiplication...) */
bo_stride = KMSDRM_gbm_bo_get_stride(dispdata->cursor_bo);
bufsize = bo_stride * curdata->h;
ready_buffer = (uint32_t*)SDL_malloc(bufsize);
if (!ready_buffer) {
ret = SDL_OutOfMemory();
goto cleanup;
}
/* Clean the whole buffer we are preparing. */
SDL_memset(ready_buffer, 0x00, bo_stride * curdata->h);
/* Copy from the cursor buffer to a buffer that we can dump to the GBM BO,
pre-multiplying by alpha each pixel as we go. */
for (i = 0; i < curdata->h; i++) {
for (j = 0; j < curdata->w; j++) {
pixel = ((uint32_t*)curdata->buffer)[i * curdata->w + j];
alpha_premultiply_ARGB8888 (&pixel);
SDL_memcpy(ready_buffer + (i * dispdata->cursor_w) + j, &pixel, 4);
}
}
/* Dump the cursor buffer to our GBM BO. */
if (KMSDRM_gbm_bo_write(dispdata->cursor_bo, ready_buffer, bufsize)) {
ret = SDL_SetError("Could not write to GBM cursor BO");
goto cleanup;
}
/* Get the fb_id for the GBM BO so we can show it on the cursor plane. */
fb = KMSDRM_FBFromBO(video_device, dispdata->cursor_bo);
/* Show the GBM BO buffer on the cursor plane. */
info.plane = dispdata->cursor_plane;
info.crtc_id = dispdata->crtc->crtc->crtc_id;
info.fb_id = fb->fb_id;
@ -283,10 +299,18 @@ KMSDRM_ShowCursor(SDL_Cursor * cursor)
drm_atomic_set_plane_props(&info);
if (drm_atomic_commit(display->device, SDL_TRUE)) {
return SDL_SetError("Failed atomic commit in KMSDRM_ShowCursor.");
ret = SDL_SetError("Failed atomic commit in KMSDRM_ShowCursor.");
goto cleanup;
}
return 0;
ret = 0;
cleanup:
if (ready_buffer) {
SDL_free(ready_buffer);
}
return ret;
}
/* We have destroyed the cursor by now, in KMSDRM_DestroyCursor.
@ -294,9 +318,20 @@ KMSDRM_ShowCursor(SDL_Cursor * cursor)
static void
KMSDRM_FreeCursor(SDL_Cursor * cursor)
{
KMSDRM_CursorData *curdata;
/* Even if the cursor is not ours, free it. */
if (cursor) {
curdata = (KMSDRM_CursorData *) cursor->driverdata;
/* Free cursor buffer */
if (curdata->buffer) {
SDL_free(curdata->buffer);
curdata->buffer = NULL;
}
/* Free cursor itself */
if (cursor->driverdata) {
SDL_free(cursor->driverdata);
}
SDL_free(cursor);
}
}

6
src/video/kmsdrm/SDL_kmsdrmmouse.h
View File

@ -36,6 +36,12 @@ typedef struct _KMSDRM_CursorData
uint16_t hot_x, hot_y;
uint16_t w, h;
/* The buffer where we store the mouse bitmap ready to be used.
We get it ready and filled in CreateCursor(), and copy it to a GBM BO in ShowCursor().*/
uint32_t *buffer;
size_t buffer_size;
size_t buffer_pitch;
} KMSDRM_CursorData;
extern void KMSDRM_InitMouse(_THIS);