From e43934e2d2219bdd9a99c78463aa47cfc0404dcd Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Mon, 10 Jun 2024 18:41:05 +0200
Subject: Remove video_alignment_padding variable, replace with putting capture
 content in the center with frame resolution and capture resolution diff

---
 include/capture/capture.h |  1 -
 include/capture/kms.h     |  1 -
 src/capture/kms.c         | 16 ++++++++++------
 src/capture/xcomposite.c  |  3 ---
 4 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/include/capture/capture.h b/include/capture/capture.h
index c8b0cdf..2eb8e42 100644
--- a/include/capture/capture.h
+++ b/include/capture/capture.h
@@ -42,7 +42,6 @@ struct gsr_capture_base {
     gsr_color_conversion color_conversion;
 
     AVCodecContext *video_codec_context;
-    vec2i video_alignment_padding;
 };
 
 typedef struct {
diff --git a/include/capture/kms.h b/include/capture/kms.h
index b6965fd..674813a 100644
--- a/include/capture/kms.h
+++ b/include/capture/kms.h
@@ -39,7 +39,6 @@ struct gsr_capture_kms {
     AVContentLightMetadata *light_metadata;
 
     gsr_monitor_rotation monitor_rotation;
-    vec2i video_alignment_padding;
 };
 
 /* Returns 0 on success */
diff --git a/src/capture/kms.c b/src/capture/kms.c
index be7e58d..e479019 100644
--- a/src/capture/kms.c
+++ b/src/capture/kms.c
@@ -10,6 +10,10 @@
 #define HDMI_STATIC_METADATA_TYPE1 0
 #define HDMI_EOTF_SMPTE_ST2084 2
 
+static int max_int(int a, int b) {
+    return a > b ? a : b;
+}
+
 /* TODO: On monitor reconfiguration, find monitor x, y, width and height again. Do the same for nvfbc. */
 
 typedef struct {
@@ -82,9 +86,6 @@ int gsr_capture_kms_start(gsr_capture_kms *self, const char *display_to_capture,
         self->base.video_codec_context->height = FFALIGN(self->capture_size.y, 2);
     }
 
-    self->base.video_alignment_padding.x = self->base.video_codec_context->width - self->capture_size.x;
-    self->base.video_alignment_padding.y = self->base.video_codec_context->height - self->capture_size.y;
-
     frame->width = self->base.video_codec_context->width;
     frame->height = self->base.video_codec_context->height;
     return 0;
@@ -300,8 +301,11 @@ bool gsr_capture_kms_capture(gsr_capture_kms *self, AVFrame *frame, bool hdr, bo
 
     const float texture_rotation = monitor_rotation_to_radians(self->monitor_rotation);
 
+    const int target_x = max_int(0, frame->width / 2 - self->capture_size.x / 2);
+    const int target_y = max_int(0, frame->height / 2 - self->capture_size.y / 2);
+
     gsr_color_conversion_draw(&self->base.color_conversion, self->base.input_texture,
-        (vec2i){self->base.video_alignment_padding.x / 2, self->base.video_alignment_padding.y / 2}, self->capture_size,
+        (vec2i){target_x, target_y}, self->capture_size,
         capture_pos, self->capture_size,
         texture_rotation, false);
 
@@ -332,8 +336,8 @@ bool gsr_capture_kms_capture(gsr_capture_kms *self, AVFrame *frame, bool hdr, bo
                 break;
         }
 
-        cursor_pos.x += (self->base.video_alignment_padding.x / 2);
-        cursor_pos.y += (self->base.video_alignment_padding.y / 2);
+        cursor_pos.x += target_x;
+        cursor_pos.y += target_y;
 
         const intptr_t img_attr_cursor[] = {
             EGL_LINUX_DRM_FOURCC_EXT,       cursor_drm_fd->pixel_format,
diff --git a/src/capture/xcomposite.c b/src/capture/xcomposite.c
index b8f8962..47daa99 100644
--- a/src/capture/xcomposite.c
+++ b/src/capture/xcomposite.c
@@ -112,9 +112,6 @@ int gsr_capture_xcomposite_start(gsr_capture_xcomposite *self, AVCodecContext *v
         video_codec_context->height = FFALIGN(video_size.y, 2);
     }
 
-    self->base.video_alignment_padding.x = self->base.video_codec_context->width - video_size.x;
-    self->base.video_alignment_padding.y = self->base.video_codec_context->height - video_size.y;
-
     frame->width = video_codec_context->width;
     frame->height = video_codec_context->height;
 
-- 
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