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cursor-capture.c
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cursor-capture.c
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#include <windows.h>
#include <obs.h>
#include "cursor-capture.h"
static uint8_t *get_bitmap_data(HBITMAP hbmp, BITMAP *bmp)
{
if (GetObject(hbmp, sizeof(*bmp), bmp) != 0) {
uint8_t *output;
unsigned int size =
(bmp->bmHeight * bmp->bmWidth * bmp->bmBitsPixel) / 8;
output = bmalloc(size);
GetBitmapBits(hbmp, size, output);
return output;
}
return NULL;
}
static inline uint8_t bit_to_alpha(uint8_t *data, long pixel, bool invert)
{
uint8_t pix_byte = data[pixel / 8];
bool alpha = (pix_byte >> (7 - pixel % 8) & 1) != 0;
if (invert) {
return alpha ? 0xFF : 0;
} else {
return alpha ? 0 : 0xFF;
}
}
static inline bool bitmap_has_alpha(uint8_t *data, long num_pixels)
{
for (long i = 0; i < num_pixels; i++) {
if (data[i * 4 + 3] != 0) {
return true;
}
}
return false;
}
static inline void apply_mask(uint8_t *color, uint8_t *mask, long num_pixels)
{
for (long i = 0; i < num_pixels; i++)
color[i * 4 + 3] = bit_to_alpha(mask, i, false);
}
static inline uint8_t *copy_from_color(ICONINFO *ii, uint32_t *width,
uint32_t *height)
{
BITMAP bmp_color;
BITMAP bmp_mask;
uint8_t *color;
uint8_t *mask;
color = get_bitmap_data(ii->hbmColor, &bmp_color);
if (!color) {
return NULL;
}
if (bmp_color.bmBitsPixel < 32) {
bfree(color);
return NULL;
}
mask = get_bitmap_data(ii->hbmMask, &bmp_mask);
if (mask) {
long pixels = bmp_color.bmHeight * bmp_color.bmWidth;
if (!bitmap_has_alpha(color, pixels))
apply_mask(color, mask, pixels);
bfree(mask);
}
*width = bmp_color.bmWidth;
*height = bmp_color.bmHeight;
return color;
}
static inline uint8_t *copy_from_mask(ICONINFO *ii, uint32_t *width,
uint32_t *height)
{
uint8_t *output;
uint8_t *mask;
long pixels;
long bottom;
BITMAP bmp;
mask = get_bitmap_data(ii->hbmMask, &bmp);
if (!mask) {
return NULL;
}
bmp.bmHeight /= 2;
pixels = bmp.bmHeight * bmp.bmWidth;
output = bzalloc(pixels * 4);
bottom = bmp.bmWidthBytes * bmp.bmHeight;
for (long i = 0; i < pixels; i++) {
uint8_t alpha = bit_to_alpha(mask, i, false);
uint8_t color = bit_to_alpha(mask + bottom, i, true);
if (!alpha) {
output[i * 4 + 3] = color;
} else {
*(uint32_t *)&output[i * 4] = !!color ? 0xFFFFFFFF
: 0xFF000000;
}
}
bfree(mask);
*width = bmp.bmWidth;
*height = bmp.bmHeight;
return output;
}
static inline uint8_t *cursor_capture_icon_bitmap(ICONINFO *ii, uint32_t *width,
uint32_t *height)
{
uint8_t *output;
output = copy_from_color(ii, width, height);
if (!output)
output = copy_from_mask(ii, width, height);
return output;
}
static gs_texture_t *get_cached_texture(struct cursor_data *data, uint32_t cx,
uint32_t cy)
{
struct cached_cursor cc;
for (size_t i = 0; i < data->cached_textures.num; i++) {
struct cached_cursor *pcc = &data->cached_textures.array[i];
if (pcc->cx == cx && pcc->cy == cy)
return pcc->texture;
}
cc.texture = gs_texture_create(cx, cy, GS_BGRA, 1, NULL, GS_DYNAMIC);
cc.cx = cx;
cc.cy = cy;
da_push_back(data->cached_textures, &cc);
return cc.texture;
}
static inline bool cursor_capture_icon(struct cursor_data *data, HICON icon)
{
uint8_t *bitmap;
uint32_t height;
uint32_t width;
ICONINFO ii;
if (!icon) {
return false;
}
if (!GetIconInfo(icon, &ii)) {
return false;
}
bitmap = cursor_capture_icon_bitmap(&ii, &width, &height);
if (bitmap) {
if (data->last_cx != width || data->last_cy != height) {
data->texture = get_cached_texture(data, width, height);
data->last_cx = width;
data->last_cy = height;
}
gs_texture_set_image(data->texture, bitmap, width * 4, false);
bfree(bitmap);
data->x_hotspot = ii.xHotspot;
data->y_hotspot = ii.yHotspot;
}
DeleteObject(ii.hbmColor);
DeleteObject(ii.hbmMask);
return !!data->texture;
}
void cursor_capture(struct cursor_data *data)
{
CURSORINFO ci = {0};
HICON icon;
ci.cbSize = sizeof(ci);
if (!GetCursorInfo(&ci)) {
data->visible = false;
return;
}
memcpy(&data->cursor_pos, &ci.ptScreenPos, sizeof(data->cursor_pos));
if (data->current_cursor == ci.hCursor) {
return;
}
icon = CopyIcon(ci.hCursor);
data->visible = cursor_capture_icon(data, icon);
data->current_cursor = ci.hCursor;
if ((ci.flags & CURSOR_SHOWING) == 0)
data->visible = false;
DestroyIcon(icon);
}
void cursor_draw(struct cursor_data *data, long x_offset, long y_offset,
long width, long height)
{
long x = data->cursor_pos.x + x_offset;
long y = data->cursor_pos.y + y_offset;
long x_draw = x - data->x_hotspot;
long y_draw = y - data->y_hotspot;
if (x < 0 || x > width || y < 0 || y > height)
return;
if (data->visible && !!data->texture) {
gs_blend_state_push();
gs_blend_function(GS_BLEND_SRCALPHA, GS_BLEND_INVSRCALPHA);
gs_enable_color(true, true, true, false);
gs_matrix_push();
obs_source_draw(data->texture, x_draw, y_draw, 0, 0, false);
gs_matrix_pop();
gs_enable_color(true, true, true, true);
gs_blend_state_pop();
}
}
void cursor_data_free(struct cursor_data *data)
{
for (size_t i = 0; i < data->cached_textures.num; i++) {
struct cached_cursor *pcc = &data->cached_textures.array[i];
gs_texture_destroy(pcc->texture);
}
da_free(data->cached_textures);
memset(data, 0, sizeof(*data));
}